Publish

- @0x/contracts-erc20@3.3.55
 - @0x/contracts-test-utils@5.4.45
 - @0x/contracts-treasury@1.4.38
 - @0x/contracts-utils@4.8.36
 - @0x/contracts-zero-ex@0.38.4
 - @0x/contract-addresses@8.0.1
 - @0x/contract-artifacts@3.18.3
 - @0x/contract-wrappers@13.22.14
 - @0x/protocol-utils@11.17.4

.circleci/config.yml

@@ -1,337 +0,0 @@
-version: 2.1
-
-parameters:
-    cache_version:
-        type: string
-        default: v5
-
-jobs:
-    build:
-        resource_class: xlarge
-        docker:
-            - image: node:16
-        environment:
-            NODE_OPTIONS: '--max-old-space-size=16384'
-        steps:
-            - checkout
-            - run: git submodule update --init --recursive
-            - run: echo 'export PATH=$HOME/CIRCLE_PROJECT_REPONAME/node_modules/.bin:$PATH' >> $BASH_ENV
-            - restore_cache:
-                  keys:
-                      - lib-{{ .Environment.CIRCLE_SHA1 }}-feat/NerveMixinArbitrum
-            - restore_cache:
-                  keys:
-                      - cache-{{ checksum "yarn.lock" }}-<< pipeline.parameters.cache_version >>
-            - run:
-                  name: install-yarn
-                  command: npm install --force --global yarn@1.22.0
-            - run:
-                  name: yarn
-                  command: yarn --frozen-lockfile --ignore-engines install || yarn --frozen-lockfile --ignore-engines install
-            - setup_remote_docker
-            - run: yarn build:ci
-            - save_cache:
-                  key: cache-{{ checksum "yarn.lock" }}-<< pipeline.parameters.cache_version >>
-                  paths:
-                      - ~/project/node_modules
-                      - ~/.cache/yarn
-            - save_cache:
-                  key: lib-{{ .Environment.CIRCLE_SHA1 }}-<< pipeline.parameters.cache_version >>
-                  paths:
-                      - ~/project/contracts/erc20/generated-artifacts/
-                      - ~/project/contracts/erc20/generated-wrappers/
-                      - ~/project/contracts/erc20/lib/
-                      - ~/project/contracts/erc20/node_modules
-                      - ~/project/contracts/erc20/test/generated-artifacts/
-                      - ~/project/contracts/erc20/test/generated-wrappers/
-                      - ~/project/contracts/test-utils/lib/
-                      - ~/project/contracts/test-utils/node_modules
-                      - ~/project/contracts/treasury/generated-artifacts/
-                      - ~/project/contracts/treasury/generated-wrappers/
-                      - ~/project/contracts/treasury/lib/
-                      - ~/project/contracts/treasury/node_modules
-                      - ~/project/contracts/treasury/test/generated-artifacts/
-                      - ~/project/contracts/treasury/test/generated-wrappers/
-                      - ~/project/contracts/utils/generated-artifacts/
-                      - ~/project/contracts/utils/generated-wrappers/
-                      - ~/project/contracts/utils/lib/
-                      - ~/project/contracts/utils/node_modules
-                      - ~/project/contracts/utils/test/generated-artifacts/
-                      - ~/project/contracts/utils/test/generated-wrappers/
-                      - ~/project/contracts/zero-ex/generated-artifacts/
-                      - ~/project/contracts/zero-ex/generated-wrappers/
-                      - ~/project/contracts/zero-ex/lib/
-                      - ~/project/contracts/zero-ex/node_modules
-                      - ~/project/contracts/zero-ex/test/generated-artifacts/
-                      - ~/project/contracts/zero-ex/test/generated-wrappers/
-                      - ~/project/packages/asset-swapper/node_modules
-                      - ~/project/packages/contract-addresses/lib/
-                      - ~/project/packages/contract-addresses/node_modules
-                      - ~/project/packages/contract-artifacts/lib/
-                      - ~/project/packages/contract-artifacts/node_modules
-                      - ~/project/packages/contract-wrappers/lib/
-                      - ~/project/packages/contract-wrappers/node_modules
-                      - ~/project/packages/protocol-utils/lib/
-                      - ~/project/packages/protocol-utils/node_modules
-            - store_artifacts:
-                  path: ~/repo/packages/abi-gen/test-cli/output
-            - store_artifacts:
-                  path: ~/repo/packages/contract-wrappers/generated_docs
-    test-exchange-ganache:
-        resource_class: xlarge
-        docker:
-            - image: node:16
-        steps:
-            - checkout
-            - restore_cache:
-                  keys:
-                      - cache-{{ checksum "yarn.lock" }}-<< pipeline.parameters.cache_version >>
-            - restore_cache:
-                  keys:
-                      - lib-{{ .Environment.CIRCLE_SHA1 }}-<< pipeline.parameters.cache_version >>
-            - run: yarn wsrun -p @0x/contracts-exchange -m --serial -c test:circleci
-    test-integrations-ganache:
-        resource_class: xlarge
-        docker:
-            - image: node:16
-        steps:
-            - checkout
-            - restore_cache:
-                  keys:
-                      - cache-{{ checksum "yarn.lock" }}-<< pipeline.parameters.cache_version >>
-            - restore_cache:
-                  keys:
-                      - lib-{{ .Environment.CIRCLE_SHA1 }}-<< pipeline.parameters.cache_version >>
-            - run: yarn wsrun -p @0x/contracts-integrations -m --serial -c test:circleci
-    test-contracts-staking-ganache:
-        resource_class: xlarge
-        docker:
-            - image: node:16
-        steps:
-            - checkout
-            - restore_cache:
-                  keys:
-                      - cache-{{ checksum "yarn.lock" }}-<< pipeline.parameters.cache_version >>
-                      - lib-{{ .Environment.CIRCLE_SHA1 }}-<< pipeline.parameters.cache_version >>
-            - run: yarn wsrun -p @0x/contracts-staking -m --serial -c test:circleci
-    test-contracts-extra-ganache:
-        resource_class: xlarge
-        docker:
-            - image: node:16
-        steps:
-            - checkout
-            - restore_cache:
-                  keys:
-                      - cache-{{ checksum "yarn.lock" }}
-            - restore_cache:
-                  keys:
-                      - lib-{{ .Environment.CIRCLE_SHA1 }}-<< pipeline.parameters.cache_version >>
-            - run: yarn wsrun -p @0x/contracts-exchange-forwarder -p @0x/contracts-coordinator -m --serial -c test:circleci
-    test-contracts-rest-ganache:
-        resource_class: xlarge
-        docker:
-            - image: node:16
-        steps:
-            - checkout
-            - run: |
-                  git diff --name-only development >> changed.txt
-                  if ! grep -q \.sol changed.txt; then
-                    circleci-agent step halt
-                  fi
-            - restore_cache:
-                  keys:
-                      - cache-{{ checksum "yarn.lock" }}-<< pipeline.parameters.cache_version >>
-            - restore_cache:
-                  keys:
-                      - lib-{{ .Environment.CIRCLE_SHA1 }}-<< pipeline.parameters.cache_version >>
-            - run: |
-                  yarn wsrun \
-                    -p @0x/contracts-multisig \
-                    -p @0x/contracts-utils \
-                    -p @0x/contracts-exchange-libs \
-                    -p @0x/contracts-erc20 \
-                    -p @0x/contracts-erc721 \
-                    -p @0x/contracts-erc1155 \
-                    -p @0x/contracts-asset-proxy \
-                    -p @0x/contracts-broker \
-                    -p @0x/contracts-zero-ex \
-                    -m --serial -c test:circleci
-    test-foundry:
-        resource_class: xlarge
-        docker:
-            - image: ghcr.io/foundry-rs/foundry:latest
-        steps:
-            - checkout
-            - run: |
-                  git diff --name-only development >> changed.txt
-                  cat changed.txt
-                  if ! grep -q \.sol changed.txt; then
-                    circleci-agent step halt
-                  fi
-            - restore_cache:
-                  keys:
-                      - cache-{{ checksum "yarn.lock" }}-<< pipeline.parameters.cache_version >>
-            - restore_cache:
-                  keys:
-                      - lib-{{ .Environment.CIRCLE_SHA1 }}-<< pipeline.parameters.cache_version >>
-            - run: git submodule update --init --recursive
-            - run:
-                  command: forge test
-                  working_directory: ~/project/contracts/zero-ex
-    test-publish:
-        resource_class: large
-        environment:
-            NODE_OPTIONS: '--max-old-space-size=6442'
-        docker:
-            - image: node:16
-            - image: 0xorg/verdaccio
-        steps:
-            - checkout
-            - run: |
-                  git diff --name-only development >> changed.txt
-                  cat changed.txt
-                  if ! grep -q packages/ changed.txt; then
-                    circleci-agent step halt
-                  fi
-            - restore_cache:
-                  keys:
-                      - cache-{{ checksum "yarn.lock" }}-<< pipeline.parameters.cache_version >>
-            - restore_cache:
-                  keys:
-                      - lib-{{ .Environment.CIRCLE_SHA1 }}-<< pipeline.parameters.cache_version >>
-            - run:
-                  command: yarn test:publish:circleci
-                  no_output_timeout: 1800
-            - store_artifacts:
-                  path: ~/.npm/_logs
-    test-doc-generation:
-        docker:
-            - image: node:16
-        steps:
-            - checkout
-            - restore_cache:
-                  keys:
-                      - cache-{{ checksum "yarn.lock" }}-<< pipeline.parameters.cache_version >>
-            - restore_cache:
-                  keys:
-                      - lib-{{ .Environment.CIRCLE_SHA1 }}-<< pipeline.parameters.cache_version >>
-            - run:
-                  command: yarn test:generate_docs:circleci
-                  no_output_timeout: 1200
-    test-rest:
-        docker:
-            - image: node:16
-        environment:
-            RUST_ROUTER: 'true'
-        steps:
-            - checkout
-            - restore_cache:
-                  keys:
-                      - cache-{{ checksum "yarn.lock" }}-<< pipeline.parameters.cache_version >>
-            - restore_cache:
-                  keys:
-                      - lib-{{ .Environment.CIRCLE_SHA1 }}-<< pipeline.parameters.cache_version >>
-            - run: yarn wsrun -p @0x/contracts-test-utils -m --serial -c test:circleci
-            - run: yarn wsrun -p @0x/contract-addresses -m --serial -c test:circleci
-            - run: yarn wsrun -p @0x/contract-artifacts -m --serial -c test:circleci
-            - run: yarn wsrun -p @0x/contract-wrappers-test -m --serial -c test:circleci
-            - run: yarn wsrun -p @0x/order-utils -m --serial -c test:circleci
-            - save_cache:
-                  key: coverage-contract-wrappers-test-{{ checksum "yarn.lock" }}
-                  paths:
-                      - ~/repo/packages/contract-wrappers-test/coverage/lcov.info
-            - save_cache:
-                  key: coverage-order-utils-{{ checksum "yarn.lock" }}
-                  paths:
-                      - ~/repo/packages/order-utils/coverage/lcov.info
-            - save_cache:
-                  key: coverage-web3-wrapper-{{ checksum "yarn.lock" }}
-                  paths:
-                      - ~/repo/packages/web3-wrapper/coverage/lcov.info
-    static-tests:
-        resource_class: large
-        docker:
-            - image: node:16
-        steps:
-            - checkout
-            - restore_cache:
-                  keys:
-                      - cache-{{ checksum "yarn.lock" }}-<< pipeline.parameters.cache_version >>
-            - restore_cache:
-                  keys:
-                      - lib-{{ .Environment.CIRCLE_SHA1 }}-<< pipeline.parameters.cache_version >>
-            - run:
-                  command: yarn lerna run lint
-            - run:
-                  command: yarn prettier:ci
-            - run:
-                  command: yarn deps_versions:ci
-            - run:
-                  command: yarn diff_md_docs:ci
-    submit-coverage:
-        docker:
-            - image: node:16
-        steps:
-            - restore_cache:
-                  keys:
-                      - cache-{{ checksum "yarn.lock" }}-<< pipeline.parameters.cache_version >>
-            - restore_cache:
-                  keys:
-                      - lib-{{ .Environment.CIRCLE_SHA1 }}-<< pipeline.parameters.cache_version >>
-            - restore_cache:
-                  keys:
-                      - coverage-contract-wrappers-test-{{ checksum "yarn.lock" }}
-            - restore_cache:
-                  keys:
-                      - coverage-order-utils-{{ checksum "yarn.lock" }}
-            - restore_cache:
-                  keys:
-                      - coverage-contracts-{{ checksum "yarn.lock" }}
-            - run: yarn report_coverage
-workflows:
-    version: 2
-    main:
-        jobs:
-            - build
-            # Disabled until we begin actively developing on these packages again.
-            # - test-exchange-ganache:
-            #       requires:
-            #           - build
-            # - test-integrations-ganache:
-            #       requires:
-            #           - build
-            # - test-contracts-staking-ganache:
-            #       requires:
-            #           - build
-            # - test-contracts-extra-ganache:
-            #       requires:
-            #           - build
-            - test-foundry:
-                  requires:
-                      - build
-            - test-contracts-rest-ganache:
-                  requires:
-                      - build
-            - test-rest:
-                  requires:
-                      - build
-            - static-tests:
-                  requires:
-                      - build
-            - test-publish:
-                  requires:
-                      - build
-            - test-doc-generation:
-                  requires:
-                      - build
-            # Disabled until this repo has a coveralls API key
-            # - submit-coverage:
-            #       requires:
-            #           # Disabled until we begin actively developing on these packages again.
-            #           # - test-exchange-ganache
-            #           # - test-integrations-ganache
-            #           # - test-contracts-staking-ganache
-            #           # - test-contracts-extra-ganache
-            #           - test-contracts-rest-ganache
-            #           - test-rest
-            #           - static-tests

.github/CODEOWNERS

@@ -6,11 +6,9 @@
 
 # https://git-scm.com/docs/gitignore#_pattern_format
 
-packages/asset-swapper/ @dekz @dextracker @kyu-c
-
 # Dev tools & setup
 
-.circleci/ @dekz
+.github/ @dekz
 packages/contract-addresses/ @dekz @dextracker @kyu-c
 packages/contract-artifacts/ @dekz
 packages/protocol-utils/ @dekz

.github/CONTRIBUTING.md

@@ -8,13 +8,13 @@ We welcome contributions from anyone on the internet and are grateful for even t
 2.  Clone your fork
 3.  Follow the [installation & build steps](https://github.com/0xProject/0x-tools#install-dependencies) in the repo's top-level README.
 4.  Setup the recommended [Development Tooling](#development-tooling).
-5.  Open a PR with the `[WIP]` flag against the `development` branch and describe the change you are intending to undertake in the PR description. (see [our branch naming conventions](#branch-structure))
+5.  Open a [draft PR](https://github.blog/2019-02-14-introducing-draft-pull-requests/) against the `development` branch and describe the change you are intending to undertake in the PR description. (see [our branch naming conventions](#branch-structure))
 
-Before removing the `[WIP]` tag and submitting the PR for review, make sure:
+Before making the PR "Ready for review", make sure:
 
 -   It passes our linter checks (`yarn lint`)
 -   It is properly formatted with Prettier (`yarn prettier`)
--   It passes our continuous integration tests (See: [Enabling code coverage checks on your fork](#enabling-code-coverage-checks-on-your-fork) for instructions on getting the `submit-coverage` test to pass on forks)
+-   It passes our continuous integration tests (See: [Enabling code coverage checks on your fork](#fix-submit-coverage-ci-failure) for instructions on getting the `submit-coverage` test to pass on forks)
 -   You've created/updated the corresponding [CHANGELOG](#CHANGELOGs) entries.
 -   Your changes have sufficient test coverage (e.g regression tests have been added for bug fixes)
 
@@ -59,16 +59,14 @@ We strongly recommend you use the [VSCode](https://code.visualstudio.com/) text
 
 #### Linter
 
-We use [TSLint](https://palantir.github.io/tslint/) with [custom configs](https://github.com/0xProject/0x-tools/tree/development/packages/tslint-config) to keep our code-style consistent.
+We use [ESLint](https://eslint.org/docs/latest/) to keep our code-style consistent.
 
-Use `yarn:lint` to lint the entire monorepo, and `PKG={PACKAGE_NAME} yarn lint` to lint a specific package.
-
-If you want to change a rule, or add a custom rule, please make these changes to our [tslint-config](https://github.com/0xProject/0x-tools/tree/development/packages/tslint-config) package. All other packages have it as a dependency.
+Use `yarn lint` to lint the entire monorepo, and `PKG={PACKAGE_NAME} yarn lint` to lint a specific package.
 
 Integrate it into your text editor:
 
--   VSCode: [vscode-tslint](https://marketplace.visualstudio.com/items?itemName=eg2.tslint)
--   Atom: [linter-tslint](https://atom.io/packages/linter-tslint)
+-   VSCode: [ESLint](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint)
+-   Atom: [ESLint](https://atom.io/packages/eslint)
 
 #### Auto-formatter
 
@@ -91,15 +89,3 @@ A few of our coding conventions are not yet enforced by the linter/auto-formatte
 1.  If you _must_ cast a variable to any - try to type it back as fast as possible. (e.g., `const cw = ((zeroEx as any)._contractWrappers as ContractWrappers);`). This ensures subsequent code is type-safe.
 1.  Our enum conventions coincide with the recommended TypeScript conventions, using capitalized keys, and all-caps snake-case values. Eg `GetStats = 'GET_STATS'`
 1.  All public, exported methods/functions/classes must have associated Javadoc-style comments.
-
-### Fix `submit-coverage` CI failure
-
-If you simply fork the repo and then create a PR from it, your PR will fail the `submit-coverage` check on CI. This is because the 0x CircleCI configuration sets the `COVERALLS_REPO_TOKEN` environment variable to the token for `0xProject/0x-tools`, but when running the check against your fork the token needs to match your repo's name `your-username/0x-tools`.
-
-To facilitate this check, after creating your fork, but before creating the branch for your PR, do the following:
-
-1.  Log in to [coveralls.io](https://coveralls.io/), go to `Add Repos`, and enable your fork. Then go to the settings for that repo, and copy the `Repo Token` identifier.
-2.  Log in to [CircleCI](https://circleci.com/login), go to `Add Projects`, click the `Set Up Project` button corresponding to your fork, and then click `Start Building`. (Aside from step 3 below, no actual set up is needed, since it will use the `.circleci/config.yml` file in 0x-tools, so you can ignore all of the instruction/explanation given on the page with the `Start Building` button.)
-3.  In CircleCI, configure your project to add an environment variable, with name `COVERALLS_REPO_TOKEN`, and for the value paste in the `Repo Token` you copied in step 1.
-
-Now, when you push to your branch, CircleCI will automatically run all of the checks in your own instance, and the coverage check will work since it has the proper `Repo Token`, and the PR will magically refer to your own checks rather than running them in the 0x CircleCI instance.

.github/ISSUE_TEMPLATE.md

@@ -2,15 +2,13 @@
 
 <!--- Before submitting please check to see if this issue was already reported -->
 
-<!--- Prefix your issue title with the package name it relates to (e.g., `0x.js: ` or `general:`) -->
-
 ## Expected Behavior
 
 <!--- If you're describing a bug, tell us what should happen -->
 
 <!--- If you're suggesting a package change/improvement, tell us how it should work -->
 
-<!--- If you're suggesting a contract or protocol change/improvement, visit our ZEIPs repo -->
+<!--- If you're suggesting a contract or protocol change/improvement, visit our ZEIPs repo https://github.com/0xProject/ZEIPs -->
 
 ## Current Behavior
 
@@ -50,8 +48,8 @@
 | ------: | :------ |
 
 <!-- For example:
-|             `0x.js` | 2.0.4   |
-| `Exchange Contract` | v2      |
+|    `protocol-utils` | 2.0.4   |
+| `Exchange Contract` | v3      |
 -->
 
 | Network |
@@ -60,6 +58,6 @@
 
 <!-- For example:
 | mainnet |
-| kovan |
-| testrpc |
+| goerli |
+| development |
 -->

.github/PULL_REQUEST_TEMPLATE.md

@@ -20,7 +20,6 @@
 
 <!--- The following points should be used to indicate the progress of your PR.  Put an `x` in all the boxes that apply right now, and come back over time and check them off as you make progress.  If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
 
--   [ ] Prefix PR title with `[WIP]` if necessary.
 -   [ ] Add tests to cover changes as needed.
 -   [ ] Update documentation as needed.
 -   [ ] Add new entries to the relevant CHANGELOG.jsons.

.github/autolabeler.yml

@@ -1,6 +1,2 @@
-python: ['python-packages']
-contracts: ['contracts']
-@0x/contract-addresses: ['packages/contract-addresses']
-@0x/order-utils: ['packages/order-utils']
-@0x/contract-artifacts: ['packages/contract-artifacts']
-@0x/contract-wrappers: ['packages/contract-wrappers']
+documentation: ['docs']
+liquidity integrations: ['contracts/zero-ex/contracts/src/transformers']

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: monthly
+    target-branch: "development"

.github/stale.yml

@@ -1,19 +0,0 @@
-# Number of days of inactivity before an issue becomes stale
-daysUntilStale: 30
-# Number of days of inactivity before a stale issue is closed
-daysUntilClose: 30
-# Issues with these labels will never be considered stale
-exemptLabels:
-    - pinned
-    - security
-# Label to use when marking an issue as stale
-staleLabel: stale
-# Comment to post when marking an issue as stale. Set to `false` to disable
-markComment: >
-    This issue has been automatically marked as stale because it has not had
-    recent activity. It will be closed if no further activity occurs. Thank you
-    for your contributions.
-# Comment to post when closing a stale issue. Set to `false` to disable
-closeComment: >
-    This issue has been automatically closed because no activity occured in 7 days after being marked as stale. If it's still relevant - feel free to reopen. Thank you
-    for your contributions.

.github/workflows/ci.yml

@@ -0,0 +1,105 @@
+name: Continuous Integration
+on:
+  push:
+    branches:
+      - main
+      - development
+  pull_request:
+
+jobs:
+  build:
+    name: Build and test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+
+      - name: Setup Node
+        uses: actions/setup-node@v3
+        with:
+          node-version: "16"
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+
+      - name: Build solution
+        run: yarn build
+
+      - name: Lint typescript
+        run: yarn lint:ts
+
+      - name: Lint solidity
+        run: yarn lint:contracts
+
+      - name: Run prettier
+        run: yarn prettier:ci
+
+      - name: Check dependent packages have consistent versions
+        run: yarn deps_versions:ci
+
+      - name: Check diff in docs
+        run: yarn diff_md_docs:ci
+
+      - name: Check for broken links in markdown files
+        run: yarn test:links
+
+      - name: Test doc generation
+        run: yarn test:generate_docs:ci
+
+      - name: Test @0x/contracts-*
+        run: |
+                yarn wsrun \
+                  -p @0x/contracts-multisig \
+                  -p @0x/contracts-utils \
+                  -p @0x/contracts-exchange-libs \
+                  -p @0x/contracts-erc20 \
+                  -p @0x/contracts-erc721 \
+                  -p @0x/contracts-erc1155 \
+                  -p @0x/contracts-asset-proxy \
+                  -p @0x/contracts-broker \
+                  -p @0x/contracts-zero-ex \
+                  -m --serial -c test:ci
+
+      - name: Test local @0x/contracts-*
+        run: |
+                yarn wsrun \
+                  -p @0x/contracts-test-utils \
+                  -p @0x/contract-addresses \
+                  -p @0x/contract-artifacts \
+                  -p @0x/contract-wrappers-test \
+                  -p @0x/order-utils \
+                  -m --serial -c test:ci
+
+      - name: Add foundry
+        uses: foundry-rs/foundry-toolchain@v1
+        with:
+          version: nightly
+
+      - name: Run Forge build
+        working-directory: contracts/zero-ex
+        run: |
+          forge --version
+          forge build --sizes
+
+      - name: Run Forge tests
+        working-directory: contracts/zero-ex
+        run: |
+          forge test -vvv --gas-report
+
+      - name: Run Forge coverage
+        working-directory: contracts/zero-ex
+        run: |
+          forge coverage --report lcov
+
+      - name: Upload the coverage report to Coveralls
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          base-path: ./contracts/zero-ex/
+          path-to-lcov: ./contracts/zero-ex/lcov.info
+
+
+
+
+

.github/workflows/stale.yml

@@ -0,0 +1,40 @@
+name: "Close stale issues and PRs"
+on:
+  schedule:
+    - cron: "0 8 * * 1-5" # This is in UTC.
+  # Do a dry-run (debug-only: true) whenever this workflow itself is changed.
+  pull_request:
+    paths:
+      - .github/workflows/stale.yml
+    types:
+      - opened
+      - synchronize
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v7
+        with:
+          ascending: true # Spend API operations budget on older, more-likely-to-get-closed issues first
+          close-issue-message: "" # Leave no comment when closing
+          close-pr-message: "" # Leave no comment when closing
+          days-before-issue-stale: 30
+          days-before-pr-stale: 30
+          days-before-close: 14
+          debug-only: ${{ github.event_name == 'pull_request' }} # Dry-run when true.
+          exempt-issue-labels: bug,enhancement,feature,question
+          # No actual changes get made in debug-only mode, so we can raise the operations ceiling.
+          operations-per-run: ${{ github.event_name == 'pull_request' && 100 || 30}}
+          stale-issue-label: stale
+          stale-issue-message: "This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions."
+          stale-pr-label: stale
+          stale-pr-message: "This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions."
+          # Time immemorial when in debug-only mode (ie. on pull requests).
+          # `STALEBOT_START_DATE` otherwise.
+          # You can use this as a killswitch by setting `STALEBOT_START_DATE` in the far future.
+          start-date: ${{ github.event_name == 'pull_request' && '1970-01-01T00:00:00Z' || secrets.STALEBOT_START_DATE }} # ISO 8601 or RFC 2822

.gitignore

@@ -15,9 +15,6 @@ pids
 *.db
 *.sqlite
 
-# Directory for instrumented libs generated by jscoverage/JSCover
-lib-cov
-
 # Coverage directory used by tools like istanbul
 coverage
 
@@ -80,104 +77,19 @@ TODO.md
 .idea
 
 # generated contract artifacts/
-contracts/broker/generated-artifacts/
-contracts/broker/test/generated-artifacts/
-contracts/erc20-bridge-sampler/generated-artifacts/
-contracts/erc20-bridge-sampler/test/generated-artifacts/
-contracts/integrations/generated-artifacts/
-contracts/integrations/test/generated-artifacts/
-contracts/staking/generated-artifacts/
-contracts/staking/test/generated-artifacts/
-contracts/coordinator/generated-artifacts/
-contracts/coordinator/test/generated-artifacts/
-contracts/exchange/generated-artifacts/
-contracts/exchange/test/generated-artifacts/
-contracts/asset-proxy/generated-artifacts/
-contracts/asset-proxy/test/generated-artifacts/
-contracts/multisig/generated-artifacts/
-contracts/multisig/test/generated-artifacts/
-contracts/utils/generated-artifacts/
-contracts/utils/test/generated-artifacts/
-contracts/exchange-libs/generated-artifacts/
-contracts/exchange-libs/test/generated-artifacts/
-contracts/erc20/generated-artifacts/
-contracts/erc20/test/generated-artifacts/
-contracts/erc721/generated-artifacts/
-contracts/erc721/test/generated-artifacts/
-contracts/erc1155/generated-artifacts/
-contracts/erc1155/test/generated-artifacts/
-contracts/extensions/generated-artifacts/
-contracts/extensions/test/generated-artifacts/
-contracts/exchange-forwarder/generated-artifacts/
-contracts/exchange-forwarder/test/generated-artifacts/
-contracts/dev-utils/generated-artifacts/
-contracts/dev-utils/test/generated-artifacts/
-contracts/zero-ex/generated-artifacts/
-contracts/zero-ex/test/generated-artifacts/
-contracts/treasury/generated-artifacts/
-contracts/treasury/test/generated-artifacts/
-
-# generated truffle contract artifacts/
-contracts/broker/build/
-contracts/erc20-bridge-sampler/build/
-contracts/staking/build/
-contracts/coordinator/build/
-contracts/exchange/build/
-contracts/asset-proxy/build/
-contracts/multisig/build/
-contracts/utils/build/
-contracts/exchange-libs/build/
-contracts/erc20/build/
-contracts/erc721/build/
-contracts/erc1155/build/
-contracts/extensions/build/
-contracts/exchange-forwarder/build/
-contracts/dev-utils/build/
+generated-artifacts/
 
 # generated contract wrappers
-contracts/broker/generated-wrappers/
-contracts/broker/test/generated-wrappers/
-packages/python-contract-wrappers/generated/
-contracts/erc20-bridge-sampler/generated-wrappers/
-contracts/erc20-bridge-sampler/test/generated-wrappers/
-contracts/integrations/generated-wrappers/
-contracts/integrations/test/generated-wrappers/
-contracts/staking/generated-wrappers/
-contracts/staking/test/generated-wrappers/
-contracts/coordinator/generated-wrappers/
-contracts/coordinator/test/generated-wrappers/
-contracts/exchange/generated-wrappers/
-contracts/exchange/test/generated-wrappers/
-contracts/asset-proxy/generated-wrappers/
-contracts/asset-proxy/test/generated-wrappers/
-contracts/multisig/generated-wrappers/
-contracts/multisig/test/generated-wrappers/
-contracts/utils/generated-wrappers/
-contracts/utils/test/generated-wrappers/
-contracts/exchange-libs/generated-wrappers/
-contracts/exchange-libs/test/generated-wrappers/
-contracts/erc20/generated-wrappers/
-contracts/erc20/test/generated-wrappers/
-contracts/erc721/generated-wrappers/
-contracts/erc721/test/generated-wrappers/
-contracts/erc1155/generated-wrappers/
-contracts/erc1155/test/generated-wrappers/
-contracts/extensions/generated-wrappers/
-contracts/extensions/test/generated-wrappers/
-contracts/exchange-forwarder/generated-wrappers/
-contracts/exchange-forwarder/test/generated-wrappers/
-contracts/dev-utils/generated-wrappers/
-contracts/dev-utils/test/generated-wrappers/
-contracts/zero-ex/generated-wrappers/
-contracts/zero-ex/test/generated-wrappers/
-contracts/treasury/generated-wrappers/
-contracts/treasury/test/generated-wrappers/
+generated-wrappers/
 
 # foundry artifacts
-contracts/zero-ex/foundry-artifacts/
+foundry-artifacts/
 
-# foundry cache 
-contracts/zero-ex/foundry-cache/
+# foundry cache
+cache/
+
+#foundry output artifacts
+out/
 
 # typechain wrappers
 contracts/zero-ex/typechain-wrappers/

.husky/pre-commit

@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+. "$(dirname -- "$0")/_/husky.sh"
+
+npx lint-staged --no-stash

.prettierignore

@@ -1,87 +1,10 @@
 lib
+deps
 .nyc_output
-/contracts/broker/generated-wrappers
-/contracts/broker/test/generated-wrappers
-/contracts/broker/generated-artifacts
-/contracts/broker/test/generated-artifacts
-/contracts/integrations/generated-wrappers
-/contracts/integrations/test/generated-wrappers
-/contracts/integrations/generated-artifacts
-/contracts/integrations/test/generated-artifacts
-/contracts/staking/generated-wrappers
-/contracts/staking/test/generated-wrappers
-/contracts/staking/generated-artifacts
-/contracts/staking/test/generated-artifacts
-/contracts/coordinator/generated-wrappers
-/contracts/coordinator/test/generated-wrappers
-/contracts/coordinator/generated-artifacts
-/contracts/coordinator/test/generated-artifacts
-/contracts/exchange/generated-wrappers
-/contracts/exchange/test/generated-wrappers
-/contracts/exchange/generated-artifacts
-/contracts/exchange/test/generated-artifacts
-/contracts/asset-proxy/generated-wrappers
-/contracts/asset-proxy/test/generated-wrappers
-/contracts/asset-proxy/generated-artifacts
-/contracts/asset-proxy/test/generated-artifacts
-/contracts/multisig/generated-wrappers
-/contracts/multisig/test/generated-wrappers
-/contracts/multisig/generated-artifacts
-/contracts/multisig/test/generated-artifacts
-/contracts/utils/generated-wrappers
-/contracts/utils/test/generated-wrappers
-/contracts/utils/generated-artifacts
-/contracts/utils/test/generated-artifacts
-/contracts/exchange-libs/generated-wrappers
-/contracts/exchange-libs/test/generated-wrappers
-/contracts/exchange-libs/generated-artifacts
-/contracts/exchange-libs/test/generated-artifacts
-/contracts/erc20/generated-wrappers
-/contracts/erc20/test/generated-wrappers
-/contracts/erc20/generated-artifacts
-/contracts/erc20/test/generated-artifacts
-/contracts/erc721/generated-wrappers
-/contracts/erc721/test/generated-wrappers
-/contracts/erc721/generated-artifacts
-/contracts/erc721/test/generated-artifacts
-/contracts/erc1155/generated-wrappers
-/contracts/erc1155/test/generated-wrappers
-/contracts/erc1155/generated-artifacts
-/contracts/erc1155/test/generated-artifacts
-/contracts/extensions/generated-wrappers
-/contracts/extensions/test/generated-wrappers
-/contracts/extensions/generated-artifacts
-/contracts/extensions/test/generated-artifacts
-/contracts/exchange-forwarder/generated-wrappers
-/contracts/exchange-forwarder/test/generated-wrappers
-/contracts/exchange-forwarder/generated-artifacts
-/contracts/exchange-forwarder/test/generated-artifacts
-/contracts/dev-utils/generated-wrappers
-/contracts/dev-utils/test/generated-wrappers
-/contracts/dev-utils/generated-artifacts
-/contracts/dev-utils/test/generated-artifacts
-/contracts/zero-ex/generated-wrappers
-/contracts/zero-ex/test/generated-wrappers
-/contracts/zero-ex/generated-artifacts
-/contracts/zero-ex/test/generated-artifacts
-/contracts/treasury/generated-wrappers
-/contracts/treasury/test/generated-wrappers
-/contracts/treasury/generated-artifacts
-/contracts/treasury/test/generated-artifacts
-/contracts/staking/build/
-/contracts/coordinator/build/
-/contracts/exchange/build/
-/contracts/asset-proxy/build/
-/contracts/multisig/build/
-/contracts/utils/build/
-/contracts/exchange-libs/build/
-/contracts/erc20/build/
-/contracts/erc721/build/
-/contracts/erc1155/build/
-/contracts/extensions/build/
-/contracts/exchange-forwarder/build/
-/packages/asset-swapper/
-/packages/contract-wrappers/src/generated-wrappers/
+generated-artifacts/
+generated-wrappers/
+foundry-artifacts/
+out/
+cache/
 package.json
-packages/*/docs
-docs/
+packages

.solhint.json

@@ -0,0 +1,17 @@
+{
+    "extends": "solhint:recommended",
+    "plugins": ["prettier"],
+    "rules": {
+        "prettier/prettier": "error",
+        "avoid-low-level-calls": "off",
+        "avoid-tx-origin": "warn",
+        "code-complexity": "off",
+        "const-name-snakecase": "error",
+        "function-max-lines": "off",
+        "max-line-length": ["error", 120],
+        "no-inline-assembly": "off",
+        "quotes": ["error", "double"],
+        "no-empty-blocks": "off",
+        "compiler-version": "off"
+    }
+}

.solhintignore

@@ -0,0 +1,9 @@
+contracts/erc20/contracts/src/ZRXToken.sol
+node_modules/
+lib
+deps
+generated-artifacts/
+generated-wrappers/
+foundry-artifacts/
+out/
+cache/

README.md

@@ -8,8 +8,7 @@ This repository is a monorepo including the 0x protocol smart contracts and nume
 
 [website-url]: https://0x.org
 
-[![CircleCI](https://circleci.com/gh/0xProject/protocol.svg?style=svg&circle-token=61bf7cd8c9b4e11b132089dfcffdd1be277d1e0c)](https://circleci.com/gh/0xProject/protocool)
-[![Coverage Status](https://coveralls.io/repos/github/0xProject/0x-monorepo/badge.svg?branch=development)](https://coveralls.io/github/0xProject/0x-monorepo?branch=development)
+[![Coverage Status](https://coveralls.io/repos/github/0xProject/protocol/badge.svg?branch=development)](https://coveralls.io/github/0xProject/protocol?branch=development)
 [![Discord](https://img.shields.io/badge/chat-discord.chat-yellow.svg?style=flat)](https://discordapp.com/invite/d3FTX3M)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 
@@ -54,7 +53,7 @@ You can include those by prepending the `@0x/typescript-typings` package to your
 
 We strongly recommend that the community help us make improvements and determine the future direction of the protocol. To report bugs within this package, please create an issue in this repository.
 
-#### Read our [contribution guidelines](./CONTRIBUTING.md).
+#### Read our [contribution guidelines](.github/CONTRIBUTING.md).
 
 ### Install dependencies
 

contracts/erc20/CHANGELOG.json

@@ -1,4 +1,67 @@
 [
+    {
+        "timestamp": 1674517560,
+        "version": "3.3.55",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1670879498,
+        "version": "3.3.54",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1669235113,
+        "version": "3.3.53",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1668477029,
+        "version": "3.3.52",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1667607537,
+        "version": "3.3.51",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1667427402,
+        "version": "3.3.50",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1666645023,
+        "version": "3.3.49",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1666381417,
         "version": "3.3.48",

contracts/erc20/CHANGELOG.md

@@ -5,6 +5,34 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.3.55 - _January 23, 2023_
+
+    * Dependencies updated
+
+## v3.3.54 - _December 12, 2022_
+
+    * Dependencies updated
+
+## v3.3.53 - _November 23, 2022_
+
+    * Dependencies updated
+
+## v3.3.52 - _November 15, 2022_
+
+    * Dependencies updated
+
+## v3.3.51 - _November 5, 2022_
+
+    * Dependencies updated
+
+## v3.3.50 - _November 2, 2022_
+
+    * Dependencies updated
+
+## v3.3.49 - _October 24, 2022_
+
+    * Dependencies updated
+
 ## v3.3.48 - _October 21, 2022_
 
     * Dependencies updated

contracts/erc20/README.md

@@ -20,7 +20,7 @@ We strongly recommend that the community help us make improvements and determine
 
 For proposals regarding the 0x protocol's smart contract architecture, message format, or additional functionality, go to the [0x Improvement Proposals (ZEIPs)](https://github.com/0xProject/ZEIPs) repository and follow the contribution guidelines provided therein.
 
-Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
+Please read our [contribution guidelines](../../.github/CONTRIBUTING.md) before getting started.
 
 ### Install Dependencies
 
@@ -67,7 +67,3 @@ yarn lint
 ```bash
 yarn test
 ```
-
-#### Testing options
-
-Contracts testing options like coverage, profiling, revert traces or backing node choosing - are described [here](../TESTING.md).

contracts/erc20/contracts/src/ERC20Token.sol

@@ -47,11 +47,7 @@ contract ERC20Token is IERC20Token {
     /// @param _to The address of the recipient
     /// @param _value The amount of token to be transferred
     /// @return True if transfer was successful
-    function transferFrom(
-        address _from,
-        address _to,
-        uint256 _value
-    ) external returns (bool) {
+    function transferFrom(address _from, address _to, uint256 _value) external returns (bool) {
         require(balances[_from] >= _value, "ERC20_INSUFFICIENT_BALANCE");
         require(allowed[_from][msg.sender] >= _value, "ERC20_INSUFFICIENT_ALLOWANCE");
         require(balances[_to] + _value >= balances[_to], "UINT256_OVERFLOW");

contracts/erc20/contracts/src/LibERC20Token.sol

@@ -31,11 +31,7 @@ library LibERC20Token {
     /// @param token The address of the token contract.
     /// @param spender The address that receives an allowance.
     /// @param allowance The allowance to set.
-    function approve(
-        address token,
-        address spender,
-        uint256 allowance
-    ) internal {
+    function approve(address token, address spender, uint256 allowance) internal {
         bytes memory callData = abi.encodeWithSelector(IERC20Token(0).approve.selector, spender, allowance);
         _callWithOptionalBooleanResult(token, callData);
     }
@@ -47,11 +43,7 @@ library LibERC20Token {
     /// @param token The address of the token contract.
     /// @param spender The address that receives an allowance.
     /// @param amount The minimum allowance needed.
-    function approveIfBelow(
-        address token,
-        address spender,
-        uint256 amount
-    ) internal {
+    function approveIfBelow(address token, address spender, uint256 amount) internal {
         if (IERC20Token(token).allowance(address(this), spender) < amount) {
             approve(token, spender, uint256(-1));
         }
@@ -63,11 +55,7 @@ library LibERC20Token {
     /// @param token The address of the token contract.
     /// @param to The address that receives the tokens
     /// @param amount Number of tokens to transfer.
-    function transfer(
-        address token,
-        address to,
-        uint256 amount
-    ) internal {
+    function transfer(address token, address to, uint256 amount) internal {
         bytes memory callData = abi.encodeWithSelector(IERC20Token(0).transfer.selector, to, amount);
         _callWithOptionalBooleanResult(token, callData);
     }
@@ -79,12 +67,7 @@ library LibERC20Token {
     /// @param from The owner of the tokens.
     /// @param to The address that receives the tokens
     /// @param amount Number of tokens to transfer.
-    function transferFrom(
-        address token,
-        address from,
-        address to,
-        uint256 amount
-    ) internal {
+    function transferFrom(address token, address from, address to, uint256 amount) internal {
         bytes memory callData = abi.encodeWithSelector(IERC20Token(0).transferFrom.selector, from, to, amount);
         _callWithOptionalBooleanResult(token, callData);
     }
@@ -107,11 +90,7 @@ library LibERC20Token {
     /// @param owner The owner of the tokens.
     /// @param spender The address the spender.
     /// @return allowance The allowance for a token, owner, and spender.
-    function allowance(
-        address token,
-        address owner,
-        address spender
-    ) internal view returns (uint256 allowance_) {
+    function allowance(address token, address owner, address spender) internal view returns (uint256 allowance_) {
         (bool didSucceed, bytes memory resultData) = token.staticcall(
             abi.encodeWithSelector(IERC20Token(0).allowance.selector, owner, spender)
         );

contracts/erc20/contracts/src/UnlimitedAllowanceERC20Token.sol

@@ -21,18 +21,15 @@ pragma solidity ^0.5.9;
 import "./ERC20Token.sol";
 
 contract UnlimitedAllowanceERC20Token is ERC20Token {
-    uint256 internal constant MAX_UINT = 2**256 - 1;
+    uint256 internal constant MAX_UINT = 2 ** 256 - 1;
 
-    /// @dev ERC20 transferFrom, modified such that an allowance of MAX_UINT represents an unlimited allowance. See https://github.com/ethereum/EIPs/issues/717
+    /// @dev ERC20 transferFrom, modified such that an allowance of MAX_UINT represents an unlimited allowance.
+    // See https://github.com/ethereum/EIPs/issues/717
     /// @param _from Address to transfer from.
     /// @param _to Address to transfer to.
     /// @param _value Amount to transfer.
     /// @return Success of transfer.
-    function transferFrom(
-        address _from,
-        address _to,
-        uint256 _value
-    ) external returns (bool) {
+    function transferFrom(address _from, address _to, uint256 _value) external returns (bool) {
         uint256 allowance = allowed[_from][msg.sender];
         require(balances[_from] >= _value, "ERC20_INSUFFICIENT_BALANCE");
         require(allowance >= _value, "ERC20_INSUFFICIENT_ALLOWANCE");

contracts/erc20/contracts/src/WETH9.sol

@@ -13,7 +13,6 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-// solhint-disable
 pragma solidity ^0.5.9;
 
 contract WETH9 {
@@ -59,11 +58,7 @@ contract WETH9 {
         return transferFrom(msg.sender, dst, wad);
     }
 
-    function transferFrom(
-        address src,
-        address dst,
-        uint256 wad
-    ) public returns (bool) {
+    function transferFrom(address src, address dst, uint256 wad) public returns (bool) {
         require(balanceOf[src] >= wad);
 
         if (src != msg.sender && allowance[src][msg.sender] != uint256(-1)) {

contracts/erc20/contracts/src/ZRXToken.sol

@@ -37,11 +37,7 @@ contract Token {
     /// @param _to The address of the recipient
     /// @param _value The amount of token to be transferred
     /// @return Whether the transfer was successful or not
-    function transferFrom(
-        address _from,
-        address _to,
-        uint256 _value
-    ) returns (bool success) {}
+    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {}
 
     /// @notice `msg.sender` approves `_addr` to spend `_value` tokens
     /// @param _spender The address of the account able to transfer the tokens
@@ -71,11 +67,7 @@ contract ERC20Token is Token {
         }
     }
 
-    function transferFrom(
-        address _from,
-        address _to,
-        uint256 _value
-    ) returns (bool) {
+    function transferFrom(address _from, address _to, uint256 _value) returns (bool) {
         if (
             balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value >= balances[_to]
         ) {
@@ -109,18 +101,14 @@ contract ERC20Token is Token {
 }
 
 contract UnlimitedAllowanceToken is ERC20Token {
-    uint256 constant MAX_UINT = 2**256 - 1;
+    uint256 constant MAX_UINT = 2 ** 256 - 1;
 
     /// @dev ERC20 transferFrom, modified such that an allowance of MAX_UINT represents an unlimited allowance.
     /// @param _from Address to transfer from.
     /// @param _to Address to transfer to.
     /// @param _value Amount to transfer.
     /// @return Success of transfer.
-    function transferFrom(
-        address _from,
-        address _to,
-        uint256 _value
-    ) public returns (bool) {
+    function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
         uint256 allowance = allowed[_from][msg.sender];
         if (balances[_from] >= _value && allowance >= _value && balances[_to] + _value >= balances[_to]) {
             balances[_to] += _value;
@@ -137,14 +125,11 @@ contract UnlimitedAllowanceToken is ERC20Token {
 }
 
 contract ZRXToken is UnlimitedAllowanceToken {
-    // solhint-disable const-name-snakecase
     uint8 public constant decimals = 18;
-    uint256 public totalSupply = 10**27; // 1 billion tokens, 18 decimal places
+    uint256 public totalSupply = 10 ** 27; // 1 billion tokens, 18 decimal places
     string public constant name = "0x Protocol Token";
     string public constant symbol = "ZRX";
 
-    // solhint-enableconst-name-snakecase
-
     function ZRXToken() public {
         balances[msg.sender] = totalSupply;
     }

contracts/erc20/contracts/src/interfaces/IERC20Token.sol

@@ -19,7 +19,6 @@
 pragma solidity ^0.5.9;
 
 contract IERC20Token {
-    // solhint-disable no-simple-event-func-name
     event Transfer(address indexed _from, address indexed _to, uint256 _value);
 
     event Approval(address indexed _owner, address indexed _spender, uint256 _value);
@@ -35,11 +34,7 @@ contract IERC20Token {
     /// @param _to The address of the recipient
     /// @param _value The amount of token to be transferred
     /// @return True if transfer was successful
-    function transferFrom(
-        address _from,
-        address _to,
-        uint256 _value
-    ) external returns (bool);
+    function transferFrom(address _from, address _to, uint256 _value) external returns (bool);
 
     /// @dev `msg.sender` approves `_spender` to spend `_value` tokens
     /// @param _spender The address of the account able to transfer the tokens

contracts/erc20/contracts/src/v06/IERC20TokenV06.sol

@@ -20,7 +20,6 @@
 pragma solidity ^0.6.5;
 
 interface IERC20TokenV06 {
-    // solhint-disable no-simple-event-func-name
     event Transfer(address indexed from, address indexed to, uint256 value);
 
     event Approval(address indexed owner, address indexed spender, uint256 value);
@@ -36,11 +35,7 @@ interface IERC20TokenV06 {
     /// @param to The address of the recipient
     /// @param value The amount of token to be transferred
     /// @return True if transfer was successful
-    function transferFrom(
-        address from,
-        address to,
-        uint256 value
-    ) external returns (bool);
+    function transferFrom(address from, address to, uint256 value) external returns (bool);
 
     /// @dev `msg.sender` approves `spender` to spend `value` tokens
     /// @param spender The address of the account able to transfer the tokens

contracts/erc20/contracts/src/v06/LibERC20TokenV06.sol

@@ -31,11 +31,7 @@ library LibERC20TokenV06 {
     /// @param token The address of the token contract.
     /// @param spender The address that receives an allowance.
     /// @param allowance The allowance to set.
-    function compatApprove(
-        IERC20TokenV06 token,
-        address spender,
-        uint256 allowance
-    ) internal {
+    function compatApprove(IERC20TokenV06 token, address spender, uint256 allowance) internal {
         bytes memory callData = abi.encodeWithSelector(token.approve.selector, spender, allowance);
         _callWithOptionalBooleanResult(address(token), callData);
     }
@@ -46,11 +42,7 @@ library LibERC20TokenV06 {
     /// @param token The address of the token contract.
     /// @param spender The address that receives an allowance.
     /// @param amount The minimum allowance needed.
-    function approveIfBelow(
-        IERC20TokenV06 token,
-        address spender,
-        uint256 amount
-    ) internal {
+    function approveIfBelow(IERC20TokenV06 token, address spender, uint256 amount) internal {
         if (token.allowance(address(this), spender) < amount) {
             compatApprove(token, spender, uint256(-1));
         }
@@ -61,11 +53,7 @@ library LibERC20TokenV06 {
     /// @param token The address of the token contract.
     /// @param to The address that receives the tokens
     /// @param amount Number of tokens to transfer.
-    function compatTransfer(
-        IERC20TokenV06 token,
-        address to,
-        uint256 amount
-    ) internal {
+    function compatTransfer(IERC20TokenV06 token, address to, uint256 amount) internal {
         bytes memory callData = abi.encodeWithSelector(token.transfer.selector, to, amount);
         _callWithOptionalBooleanResult(address(token), callData);
     }
@@ -76,12 +64,7 @@ library LibERC20TokenV06 {
     /// @param from The owner of the tokens.
     /// @param to The address that receives the tokens
     /// @param amount Number of tokens to transfer.
-    function compatTransferFrom(
-        IERC20TokenV06 token,
-        address from,
-        address to,
-        uint256 amount
-    ) internal {
+    function compatTransferFrom(IERC20TokenV06 token, address from, address to, uint256 amount) internal {
         bytes memory callData = abi.encodeWithSelector(token.transferFrom.selector, from, to, amount);
         _callWithOptionalBooleanResult(address(token), callData);
     }

contracts/erc20/contracts/src/v08/IERC20TokenV08.sol

@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2020 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.8.0;
+
+interface IERC20TokenV08 {
+    event Transfer(address indexed from, address indexed to, uint256 value);
+
+    event Approval(address indexed owner, address indexed spender, uint256 value);
+
+    /// @dev send `value` token to `to` from `msg.sender`
+    /// @param to The address of the recipient
+    /// @param value The amount of token to be transferred
+    /// @return True if transfer was successful
+    function transfer(address to, uint256 value) external returns (bool);
+
+    /// @dev send `value` token to `to` from `from` on the condition it is approved by `from`
+    /// @param from The address of the sender
+    /// @param to The address of the recipient
+    /// @param value The amount of token to be transferred
+    /// @return True if transfer was successful
+    function transferFrom(address from, address to, uint256 value) external returns (bool);
+
+    /// @dev `msg.sender` approves `spender` to spend `value` tokens
+    /// @param spender The address of the account able to transfer the tokens
+    /// @param value The amount of wei to be approved for transfer
+    /// @return Always true if the call has enough gas to complete execution
+    function approve(address spender, uint256 value) external returns (bool);
+
+    /// @dev Query total supply of token
+    /// @return Total supply of token
+    function totalSupply() external view returns (uint256);
+
+    /// @dev Get the balance of `owner`.
+    /// @param owner The address from which the balance will be retrieved
+    /// @return Balance of owner
+    function balanceOf(address owner) external view returns (uint256);
+
+    /// @dev Get the allowance for `spender` to spend from `owner`.
+    /// @param owner The address of the account owning tokens
+    /// @param spender The address of the account able to transfer the tokens
+    /// @return Amount of remaining tokens allowed to spent
+    function allowance(address owner, address spender) external view returns (uint256);
+
+    /// @dev Get the number of decimals this token has.
+    function decimals() external view returns (uint8);
+}

contracts/erc20/contracts/src/v08/IEtherTokenV08.sol

@@ -17,17 +17,14 @@
 
 */
 
-pragma solidity ^0.6;
+pragma solidity ^0.8.0;
 
+import "./IERC20TokenV08.sol";
 
-interface IMStable {
+interface IEtherTokenV08 is IERC20TokenV08 {
+    /// @dev Wrap ether.
+    function deposit() external payable;
 
-    function getSwapOutput(
-        address _input,
-        address _output,
-        uint256 _quantity
-    )
-        external
-        view
-        returns (uint256 swapOutput);
+    /// @dev Unwrap ether.
+    function withdraw(uint256 amount) external;
 }

contracts/erc20/contracts/src/v08/LibERC20TokenV08.sol

@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2020 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.8.0;
+
+import "@0x/contracts-utils/contracts/src/v08/errors/LibRichErrorsV08.sol";
+import "@0x/contracts-utils/contracts/src/v08/LibBytesV08.sol";
+import "./IERC20TokenV08.sol";
+
+library LibERC20TokenV08 {
+    bytes private constant DECIMALS_CALL_DATA = hex"313ce567";
+
+    /// @dev Calls `IERC20TokenV08(token).approve()`.
+    ///      Reverts if the return data is invalid or the call reverts.
+    /// @param token The address of the token contract.
+    /// @param spender The address that receives an allowance.
+    /// @param allowance The allowance to set.
+    function compatApprove(IERC20TokenV08 token, address spender, uint256 allowance) internal {
+        bytes memory callData = abi.encodeCall(token.approve, (spender, allowance));
+        _callWithOptionalBooleanResult(address(token), callData);
+    }
+
+    /// @dev Calls `IERC20TokenV08(token).approve()` and sets the allowance to the
+    ///      maximum if the current approval is not already >= an amount.
+    ///      Reverts if the return data is invalid or the call reverts.
+    /// @param token The address of the token contract.
+    /// @param spender The address that receives an allowance.
+    /// @param amount The minimum allowance needed.
+    function approveIfBelow(IERC20TokenV08 token, address spender, uint256 amount) internal {
+        if (token.allowance(address(this), spender) < amount) {
+            compatApprove(token, spender, type(uint256).max);
+        }
+    }
+
+    /// @dev Calls `IERC20TokenV08(token).transfer()`.
+    ///      Reverts if the return data is invalid or the call reverts.
+    /// @param token The address of the token contract.
+    /// @param to The address that receives the tokens
+    /// @param amount Number of tokens to transfer.
+    function compatTransfer(IERC20TokenV08 token, address to, uint256 amount) internal {
+        bytes memory callData = abi.encodeCall(token.transfer, (to, amount));
+        _callWithOptionalBooleanResult(address(token), callData);
+    }
+
+    /// @dev Calls `IERC20TokenV08(token).transferFrom()`.
+    ///      Reverts if the return data is invalid or the call reverts.
+    /// @param token The address of the token contract.
+    /// @param from The owner of the tokens.
+    /// @param to The address that receives the tokens
+    /// @param amount Number of tokens to transfer.
+    function compatTransferFrom(IERC20TokenV08 token, address from, address to, uint256 amount) internal {
+        bytes memory callData = abi.encodeCall(token.transferFrom, (from, to, amount));
+        _callWithOptionalBooleanResult(address(token), callData);
+    }
+
+    /// @dev Retrieves the number of decimals for a token.
+    ///      Returns `18` if the call reverts.
+    /// @param token The address of the token contract.
+    /// @return tokenDecimals The number of decimals places for the token.
+    function compatDecimals(IERC20TokenV08 token) internal view returns (uint8 tokenDecimals) {
+        tokenDecimals = 18;
+        (bool didSucceed, bytes memory resultData) = address(token).staticcall(DECIMALS_CALL_DATA);
+        if (didSucceed && resultData.length >= 32) {
+            tokenDecimals = abi.decode(resultData, (uint8));
+        }
+    }
+
+    /// @dev Retrieves the allowance for a token, owner, and spender.
+    ///      Returns `0` if the call reverts.
+    /// @param token The address of the token contract.
+    /// @param owner The owner of the tokens.
+    /// @param spender The address the spender.
+    /// @return allowance_ The allowance for a token, owner, and spender.
+    function compatAllowance(
+        IERC20TokenV08 token,
+        address owner,
+        address spender
+    ) internal view returns (uint256 allowance_) {
+        (bool didSucceed, bytes memory resultData) = address(token).staticcall(
+            abi.encodeCall(token.allowance, (owner, spender))
+        );
+        if (didSucceed && resultData.length >= 32) {
+            allowance_ = abi.decode(resultData, (uint256));
+        }
+    }
+
+    /// @dev Retrieves the balance for a token owner.
+    ///      Returns `0` if the call reverts.
+    /// @param token The address of the token contract.
+    /// @param owner The owner of the tokens.
+    /// @return balance The token balance of an owner.
+    function compatBalanceOf(IERC20TokenV08 token, address owner) internal view returns (uint256 balance) {
+        (bool didSucceed, bytes memory resultData) = address(token).staticcall(
+            abi.encodeCall(token.balanceOf, (owner))
+        );
+        if (didSucceed && resultData.length >= 32) {
+            balance = abi.decode(resultData, (uint256));
+        }
+    }
+
+    /// @dev Executes a call on address `target` with calldata `callData`
+    ///      and asserts that either nothing was returned or a single boolean
+    ///      was returned equal to `true`.
+    /// @param target The call target.
+    /// @param callData The abi-encoded call data.
+    function _callWithOptionalBooleanResult(address target, bytes memory callData) private {
+        (bool didSucceed, bytes memory resultData) = target.call(callData);
+        // Revert if the call reverted.
+        if (!didSucceed) {
+            LibRichErrorsV08.rrevert(resultData);
+        }
+        // If we get back 0 returndata, this may be a non-standard ERC-20 that
+        // does not return a boolean. Check that it at least contains code.
+        if (resultData.length == 0) {
+            require(target.code.length > 0, "invalid token address, contains no code");
+            return;
+        }
+        // If we get back at least 32 bytes, we know the target address
+        // contains code, and we assume it is a token that returned a boolean
+        // success value, which must be true.
+        if (resultData.length >= 32) {
+            if (!abi.decode(resultData, (bool))) {
+                LibRichErrorsV08.rrevert(resultData);
+            }
+        }
+        // If 0 < returndatasize < 32, the target is a contract, but not a
+        // valid token.
+        LibRichErrorsV08.rrevert(resultData);
+    }
+}

contracts/erc20/contracts/test/DummyERC20Token.sol

@@ -30,12 +30,7 @@ contract DummyERC20Token is Ownable, MintableERC20Token {
     uint256 public decimals;
     uint256 public constant MAX_MINT_AMOUNT = 10000000000000000000000;
 
-    constructor(
-        string memory _name,
-        string memory _symbol,
-        uint256 _decimals,
-        uint256 _totalSupply
-    ) public {
+    constructor(string memory _name, string memory _symbol, uint256 _decimals, uint256 _totalSupply) public {
         name = _name;
         symbol = _symbol;
         decimals = _decimals;

contracts/erc20/contracts/test/DummyMultipleReturnERC20Token.sol

@@ -20,7 +20,6 @@ pragma solidity ^0.5.5;
 
 import "./DummyERC20Token.sol";
 
-// solhint-disable no-empty-blocks
 contract DummyMultipleReturnERC20Token is DummyERC20Token {
     constructor(
         string memory _name,
@@ -33,14 +32,11 @@ contract DummyMultipleReturnERC20Token is DummyERC20Token {
     /// @param _from The address of the sender
     /// @param _to The address of the recipient
     /// @param _value The amount of token to be transferred
-    function transferFrom(
-        address _from,
-        address _to,
-        uint256 _value
-    ) external returns (bool) {
+    function transferFrom(address _from, address _to, uint256 _value) external returns (bool) {
         emit Transfer(_from, _to, _value);
 
-        // HACK: This contract will not compile if we remove `returns (bool)`, so we manually return 64 bytes (equiavalent to true, true)
+        // HACK: This contract will not compile if we remove `returns (bool)`, so we manually return 64 bytes
+        // (equiavalent to true, true)
         assembly {
             mstore(0, 1)
             mstore(32, 1)

contracts/erc20/contracts/test/DummyNoReturnERC20Token.sol

@@ -20,7 +20,6 @@ pragma solidity ^0.5.5;
 
 import "./DummyERC20Token.sol";
 
-// solhint-disable no-empty-blocks
 contract DummyNoReturnERC20Token is DummyERC20Token {
     constructor(
         string memory _name,
@@ -51,11 +50,7 @@ contract DummyNoReturnERC20Token is DummyERC20Token {
     /// @param _from The address of the sender
     /// @param _to The address of the recipient
     /// @param _value The amount of token to be transferred
-    function transferFrom(
-        address _from,
-        address _to,
-        uint256 _value
-    ) external returns (bool) {
+    function transferFrom(address _from, address _to, uint256 _value) external returns (bool) {
         require(balances[_from] >= _value, "ERC20_INSUFFICIENT_BALANCE");
         require(allowed[_from][msg.sender] >= _value, "ERC20_INSUFFICIENT_ALLOWANCE");
         require(balances[_to] + _value >= balances[_to], "UINT256_OVERFLOW");

contracts/erc20/contracts/test/TestLibERC20TokenTarget.sol

@@ -29,11 +29,7 @@ contract TestLibERC20TokenTarget {
     bytes private _revertData;
     bytes private _returnData;
 
-    function setBehavior(
-        bool shouldRevert,
-        bytes calldata revertData,
-        bytes calldata returnData
-    ) external {
+    function setBehavior(bool shouldRevert, bytes calldata revertData, bytes calldata returnData) external {
         _shouldRevert = shouldRevert;
         _revertData = revertData;
         _returnData = returnData;
@@ -49,11 +45,7 @@ contract TestLibERC20TokenTarget {
         _execute();
     }
 
-    function transferFrom(
-        address from,
-        address to,
-        uint256 amount
-    ) external returns (bool) {
+    function transferFrom(address from, address to, uint256 amount) external returns (bool) {
         emit TransferFromCalled(from, to, amount);
         _execute();
     }

contracts/erc20/contracts/test/UntransferrableDummyERC20Token.sol

@@ -20,8 +20,6 @@ pragma solidity ^0.5.5;
 
 import "./DummyERC20Token.sol";
 
-// solhint-disable no-empty-blocks
-// solhint-disable no-unused-vars
 contract UntransferrableDummyERC20Token is DummyERC20Token {
     constructor(
         string memory _name,
@@ -34,11 +32,7 @@ contract UntransferrableDummyERC20Token is DummyERC20Token {
     /// @param _from The address of the sender
     /// @param _to The address of the recipient
     /// @param _value The amount of token to be transferred
-    function transferFrom(
-        address _from,
-        address _to,
-        uint256 _value
-    ) external returns (bool) {
+    function transferFrom(address _from, address _to, uint256 _value) external returns (bool) {
         require(false, "TRANSFER_DISABLED");
     }
 }

contracts/erc20/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc20",
-    "version": "3.3.48",
+    "version": "3.3.55",
     "engines": {
         "node": ">=6.12"
     },
@@ -15,7 +15,6 @@
         "pre_build": "run-s compile contracts:gen generate_contract_wrappers contracts:copy",
         "test": "yarn run_mocha",
         "rebuild_and_test": "run-s build test",
-        "test:coverage": "SOLIDITY_COVERAGE=true run-s build run_mocha coverage:report:text coverage:report:lcov",
         "test:profiler": "SOLIDITY_PROFILER=true run-s build run_mocha profiler:report:html",
         "test:trace": "SOLIDITY_REVERT_TRACE=true run-s build run_mocha",
         "run_mocha": "mocha --require source-map-support/register --require make-promises-safe 'lib/test/**/*.js' --timeout 100000 --bail --exit",
@@ -25,11 +24,7 @@
         "generate_contract_wrappers": "abi-gen --debug --abis  ${npm_package_config_abis} --output test/generated-wrappers --backend ethers",
         "lint": "eslint src test",
         "fix": "eslint --fix src test",
-        "coverage:report:text": "istanbul report text",
-        "coverage:report:html": "istanbul report html && open coverage/index.html",
-        "profiler:report:html": "istanbul report html && open coverage/index.html",
-        "coverage:report:lcov": "istanbul report lcov",
-        "test:circleci": "yarn test",
+        "test:ci": "yarn test",
         "contracts:gen": "contracts-gen generate",
         "contracts:copy": "contracts-gen copy",
         "docs:md": "ts-doc-gen --sourceDir='$PROJECT_FILES' --output=$MD_FILE_DIR --fileExtension=mdx --tsconfig=./typedoc-tsconfig.json",
@@ -37,7 +32,7 @@
     },
     "config": {
         "publicInterfaceContracts": "DummyERC20Token,ERC20Token,WETH9,ZRXToken,DummyNoReturnERC20Token,DummyMultipleReturnERC20Token",
-        "abis": "./test/generated-artifacts/@(DummyERC20Token|DummyMultipleReturnERC20Token|DummyNoReturnERC20Token|ERC20Token|IERC20Token|IERC20TokenV06|IEtherToken|IEtherTokenV06|LibERC20Token|LibERC20TokenV06|MintableERC20Token|TestLibERC20Token|TestLibERC20TokenTarget|UnlimitedAllowanceERC20Token|UntransferrableDummyERC20Token|WETH9|ZRXToken).json",
+        "abis": "./test/generated-artifacts/@(DummyERC20Token|DummyMultipleReturnERC20Token|DummyNoReturnERC20Token|ERC20Token|IERC20Token|IERC20TokenV06|IERC20TokenV08|IEtherToken|IEtherTokenV06|IEtherTokenV08|LibERC20Token|LibERC20TokenV06|LibERC20TokenV08|MintableERC20Token|TestLibERC20Token|TestLibERC20TokenTarget|UnlimitedAllowanceERC20Token|UntransferrableDummyERC20Token|WETH9|ZRXToken).json",
         "abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually."
     },
     "repository": {
@@ -52,8 +47,8 @@
     "devDependencies": {
         "@0x/abi-gen": "^5.8.1",
         "@0x/contracts-gen": "^2.0.48",
-        "@0x/contracts-test-utils": "^5.4.38",
-        "@0x/contracts-utils": "^4.8.29",
+        "@0x/contracts-test-utils": "^5.4.45",
+        "@0x/contracts-utils": "^4.8.36",
         "@0x/dev-utils": "^5.0.0",
         "@0x/sol-compiler": "^4.8.2",
         "@0x/ts-doc-gen": "^0.0.28",

contracts/erc20/test/artifacts.ts

@@ -11,10 +11,13 @@ import * as DummyNoReturnERC20Token from '../test/generated-artifacts/DummyNoRet
 import * as ERC20Token from '../test/generated-artifacts/ERC20Token.json';
 import * as IERC20Token from '../test/generated-artifacts/IERC20Token.json';
 import * as IERC20TokenV06 from '../test/generated-artifacts/IERC20TokenV06.json';
+import * as IERC20TokenV08 from '../test/generated-artifacts/IERC20TokenV08.json';
 import * as IEtherToken from '../test/generated-artifacts/IEtherToken.json';
 import * as IEtherTokenV06 from '../test/generated-artifacts/IEtherTokenV06.json';
+import * as IEtherTokenV08 from '../test/generated-artifacts/IEtherTokenV08.json';
 import * as LibERC20Token from '../test/generated-artifacts/LibERC20Token.json';
 import * as LibERC20TokenV06 from '../test/generated-artifacts/LibERC20TokenV06.json';
+import * as LibERC20TokenV08 from '../test/generated-artifacts/LibERC20TokenV08.json';
 import * as MintableERC20Token from '../test/generated-artifacts/MintableERC20Token.json';
 import * as TestLibERC20Token from '../test/generated-artifacts/TestLibERC20Token.json';
 import * as TestLibERC20TokenTarget from '../test/generated-artifacts/TestLibERC20TokenTarget.json';
@@ -34,6 +37,9 @@ export const artifacts = {
     IERC20TokenV06: IERC20TokenV06 as ContractArtifact,
     IEtherTokenV06: IEtherTokenV06 as ContractArtifact,
     LibERC20TokenV06: LibERC20TokenV06 as ContractArtifact,
+    IERC20TokenV08: IERC20TokenV08 as ContractArtifact,
+    IEtherTokenV08: IEtherTokenV08 as ContractArtifact,
+    LibERC20TokenV08: LibERC20TokenV08 as ContractArtifact,
     DummyERC20Token: DummyERC20Token as ContractArtifact,
     DummyMultipleReturnERC20Token: DummyMultipleReturnERC20Token as ContractArtifact,
     DummyNoReturnERC20Token: DummyNoReturnERC20Token as ContractArtifact,

contracts/erc20/test/global_hooks.ts

@@ -1,19 +0,0 @@
-import { env, EnvVars } from '@0x/dev-utils';
-
-import { coverage, profiler, provider } from '@0x/contracts-test-utils';
-import { providerUtils } from '@0x/utils';
-
-before('start web3 provider', () => {
-    providerUtils.startProviderEngine(provider);
-});
-after('generate coverage report', async () => {
-    if (env.parseBoolean(EnvVars.SolidityCoverage)) {
-        const coverageSubprovider = coverage.getCoverageSubproviderSingleton();
-        await coverageSubprovider.writeCoverageAsync();
-    }
-    if (env.parseBoolean(EnvVars.SolidityProfiler)) {
-        const profilerSubprovider = profiler.getProfilerSubproviderSingleton();
-        await profilerSubprovider.writeProfilerOutputAsync();
-    }
-    provider.stop();
-});

contracts/erc20/test/wrappers.ts

@@ -9,10 +9,13 @@ export * from '../test/generated-wrappers/dummy_no_return_erc20_token';
 export * from '../test/generated-wrappers/erc20_token';
 export * from '../test/generated-wrappers/i_erc20_token';
 export * from '../test/generated-wrappers/i_erc20_token_v06';
+export * from '../test/generated-wrappers/i_erc20_token_v08';
 export * from '../test/generated-wrappers/i_ether_token';
 export * from '../test/generated-wrappers/i_ether_token_v06';
+export * from '../test/generated-wrappers/i_ether_token_v08';
 export * from '../test/generated-wrappers/lib_erc20_token';
 export * from '../test/generated-wrappers/lib_erc20_token_v06';
+export * from '../test/generated-wrappers/lib_erc20_token_v08';
 export * from '../test/generated-wrappers/mintable_erc20_token';
 export * from '../test/generated-wrappers/test_lib_erc20_token';
 export * from '../test/generated-wrappers/test_lib_erc20_token_target';

contracts/erc20/truffle-config.js

@@ -1,96 +0,0 @@
-/**
- * Use this file to configure your truffle project. It's seeded with some
- * common settings for different networks and features like migrations,
- * compilation and testing. Uncomment the ones you need or modify
- * them to suit your project as necessary.
- *
- * More information about configuration can be found at:
- *
- * truffleframework.com/docs/advanced/configuration
- *
- * To deploy via Infura you'll need a wallet provider (like truffle-hdwallet-provider)
- * to sign your transactions before they're sent to a remote public node. Infura accounts
- * are available for free at: infura.io/register.
- *
- * You'll also need a mnemonic - the twelve word phrase the wallet uses to generate
- * public/private key pairs. If you're publishing your code to GitHub make sure you load this
- * phrase from a file you've .gitignored so it doesn't accidentally become public.
- *
- */
-
-// const HDWalletProvider = require('truffle-hdwallet-provider');
-// const infuraKey = "fj4jll3k.....";
-//
-// const fs = require('fs');
-// const mnemonic = fs.readFileSync(".secret").toString().trim();
-
-module.exports = {
-    /**
-     * Networks define how you connect to your ethereum client and let you set the
-     * defaults web3 uses to send transactions. If you don't specify one truffle
-     * will spin up a development blockchain for you on port 9545 when you
-     * run `develop` or `test`. You can ask a truffle command to use a specific
-     * network from the command line, e.g
-     *
-     * $ truffle test --network <network-name>
-     */
-
-    networks: {
-        // Useful for testing. The `development` name is special - truffle uses it by default
-        // if it's defined here and no other network is specified at the command line.
-        // You should run a client (like ganache-cli, geth or parity) in a separate terminal
-        // tab if you use this network and you must also set the `host`, `port` and `network_id`
-        // options below to some value.
-        //
-        // development: {
-        //  host: "127.0.0.1",     // Localhost (default: none)
-        //  port: 8545,            // Standard Ethereum port (default: none)
-        //  network_id: "*",       // Any network (default: none)
-        // },
-        // Another network with more advanced options...
-        // advanced: {
-        // port: 8777,             // Custom port
-        // network_id: 1342,       // Custom network
-        // gas: 8500000,           // Gas sent with each transaction (default: ~6700000)
-        // gasPrice: 20000000000,  // 20 gwei (in wei) (default: 100 gwei)
-        // from: <address>,        // Account to send txs from (default: accounts[0])
-        // websockets: true        // Enable EventEmitter interface for web3 (default: false)
-        // },
-        // Useful for deploying to a public network.
-        // NB: It's important to wrap the provider as a function.
-        // ropsten: {
-        // provider: () => new HDWalletProvider(mnemonic, `https://ropsten.infura.io/v3/YOUR-PROJECT-ID`),
-        // network_id: 3,       // Ropsten's id
-        // gas: 5500000,        // Ropsten has a lower block limit than mainnet
-        // confirmations: 2,    // # of confs to wait between deployments. (default: 0)
-        // timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
-        // skipDryRun: true     // Skip dry run before migrations? (default: false for public nets )
-        // },
-        // Useful for private networks
-        // private: {
-        // provider: () => new HDWalletProvider(mnemonic, `https://network.io`),
-        // network_id: 2111,   // This network is yours, in the cloud.
-        // production: true    // Treats this network as if it was a public net. (default: false)
-        // }
-    },
-
-    // Set default mocha options here, use special reporters etc.
-    mocha: {
-        // timeout: 100000
-    },
-
-    // Configure your compilers
-    compilers: {
-        solc: {
-            version: '0.5.9',
-            settings: {
-                evmVersion: 'constantinople',
-                optimizer: {
-                    enabled: true,
-                    runs: 1000000,
-                    details: { yul: true, deduplicate: true, cse: true, constantOptimizer: true },
-                },
-            },
-        },
-    },
-};

contracts/erc20/tsconfig.json

@@ -15,10 +15,13 @@
         "test/generated-artifacts/ERC20Token.json",
         "test/generated-artifacts/IERC20Token.json",
         "test/generated-artifacts/IERC20TokenV06.json",
+        "test/generated-artifacts/IERC20TokenV08.json",
         "test/generated-artifacts/IEtherToken.json",
         "test/generated-artifacts/IEtherTokenV06.json",
+        "test/generated-artifacts/IEtherTokenV08.json",
         "test/generated-artifacts/LibERC20Token.json",
         "test/generated-artifacts/LibERC20TokenV06.json",
+        "test/generated-artifacts/LibERC20TokenV08.json",
         "test/generated-artifacts/MintableERC20Token.json",
         "test/generated-artifacts/TestLibERC20Token.json",
         "test/generated-artifacts/TestLibERC20TokenTarget.json",

contracts/test-utils/CHANGELOG.json

@@ -1,4 +1,67 @@
 [
+    {
+        "timestamp": 1674517560,
+        "version": "5.4.45",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1670879498,
+        "version": "5.4.44",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1669235113,
+        "version": "5.4.43",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1668477029,
+        "version": "5.4.42",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1667607537,
+        "version": "5.4.41",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1667427402,
+        "version": "5.4.40",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1666645023,
+        "version": "5.4.39",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1666381417,
         "version": "5.4.38",

contracts/test-utils/CHANGELOG.md

@@ -5,6 +5,34 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v5.4.45 - _January 23, 2023_
+
+    * Dependencies updated
+
+## v5.4.44 - _December 12, 2022_
+
+    * Dependencies updated
+
+## v5.4.43 - _November 23, 2022_
+
+    * Dependencies updated
+
+## v5.4.42 - _November 15, 2022_
+
+    * Dependencies updated
+
+## v5.4.41 - _November 5, 2022_
+
+    * Dependencies updated
+
+## v5.4.40 - _November 2, 2022_
+
+    * Dependencies updated
+
+## v5.4.39 - _October 24, 2022_
+
+    * Dependencies updated
+
 ## v5.4.38 - _October 21, 2022_
 
     * Dependencies updated

contracts/test-utils/README.md

@@ -24,7 +24,7 @@ import {
 
 We strongly recommend that the community help us make improvements and determine the future direction of the protocol. To report bugs within this package, please create an issue in this repository.
 
-Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
+Please read our [contribution guidelines](../../.github/CONTRIBUTING.md) before getting started.
 
 ### Install Dependencies
 

contracts/test-utils/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-test-utils",
-    "version": "5.4.38",
+    "version": "5.4.45",
     "engines": {
         "node": ">=6.12"
     },
@@ -13,16 +13,11 @@
         "build": "tsc -b",
         "build:ci": "yarn build",
         "test": "yarn run_mocha",
-        "test:coverage": "run-s build run_mocha coverage:report:text coverage:report:lcov",
         "run_mocha": "mocha --require source-map-support/register --require make-promises-safe 'lib/test/**/*.js' --timeout 100000 --bail --exit",
         "clean": "shx rm -rf lib",
         "lint": "eslint src test",
         "fix": "eslint --fix src test",
-        "coverage:report:text": "istanbul report text",
-        "coverage:report:html": "istanbul report html && open coverage/index.html",
-        "profiler:report:html": "istanbul report html && open coverage/index.html",
-        "coverage:report:lcov": "istanbul report lcov",
-        "test:circleci": "yarn test"
+        "test:ci": "yarn test"
     },
     "repository": {
         "type": "git",
@@ -46,11 +41,10 @@
     "dependencies": {
         "@0x/assert": "^3.0.35",
         "@0x/base-contract": "^7.0.0",
-        "@0x/contract-addresses": "^7.0.0",
+        "@0x/contract-addresses": "^8.0.1",
         "@0x/dev-utils": "^5.0.0",
         "@0x/json-schemas": "^6.4.4",
         "@0x/order-utils": "^10.4.28",
-        "@0x/sol-coverage": "^4.0.46",
         "@0x/sol-profiler": "^4.1.36",
         "@0x/sol-trace": "^3.0.46",
         "@0x/subproviders": "^7.0.0",

contracts/test-utils/src/coverage.ts

@@ -1,26 +0,0 @@
-import { devConstants } from '@0x/dev-utils';
-import { CoverageSubprovider, SolCompilerArtifactAdapter } from '@0x/sol-coverage';
-let coverageSubprovider: CoverageSubprovider;
-
-export const coverage = {
-    getCoverageSubproviderSingleton(): CoverageSubprovider {
-        if (coverageSubprovider === undefined) {
-            coverageSubprovider = coverage._getCoverageSubprovider();
-        }
-        return coverageSubprovider;
-    },
-    _getCoverageSubprovider(): CoverageSubprovider {
-        const defaultFromAddress = devConstants.TESTRPC_FIRST_ADDRESS;
-        const solCompilerArtifactAdapter = new SolCompilerArtifactAdapter();
-        const coverageSubproviderConfig = {
-            isVerbose: true,
-            ignoreFilesGlobs: ['**/node_modules/**', '**/interfaces/**', '**/test/**'],
-        };
-        const subprovider = new CoverageSubprovider(
-            solCompilerArtifactAdapter,
-            defaultFromAddress,
-            coverageSubproviderConfig,
-        );
-        return subprovider;
-    },
-};

contracts/test-utils/src/global_hooks.ts

@@ -1,15 +0,0 @@
-import { env, EnvVars } from '@0x/dev-utils';
-
-import { coverage } from './coverage';
-import { profiler } from './profiler';
-
-after('generate coverage report', async () => {
-    if (env.parseBoolean(EnvVars.SolidityCoverage)) {
-        const coverageSubprovider = coverage.getCoverageSubproviderSingleton();
-        await coverageSubprovider.writeCoverageAsync();
-    }
-    if (env.parseBoolean(EnvVars.SolidityProfiler)) {
-        const profilerSubprovider = profiler.getProfilerSubproviderSingleton();
-        await profilerSubprovider.writeProfilerOutputAsync();
-    }
-});

contracts/test-utils/src/index.ts

@@ -20,7 +20,6 @@ export { signingUtils } from './signing_utils';
 export { orderUtils } from './order_utils';
 export { typeEncodingUtils } from './type_encoding_utils';
 export { profiler } from './profiler';
-export { coverage } from './coverage';
 export { Web3ProviderEngine } from '@0x/subproviders';
 export { randomAddress } from './address_utils';
 export { OrderFactory } from './order_factory';

contracts/test-utils/src/log_decoder.ts

@@ -35,7 +35,6 @@ export class LogDecoder {
     }
     public decodeLogOrThrow<ArgsType extends DecodedLogArgs>(log: LogEntry): LogWithDecodedArgs<ArgsType> | RawLog {
         const logWithDecodedArgsOrLog = this._abiDecoder.tryToDecodeLogOrNoop(log);
-        // tslint:disable-next-line:no-unnecessary-type-assertion
         if ((logWithDecodedArgsOrLog as LogWithDecodedArgs<ArgsType>).args === undefined) {
             throw new Error(`Unable to decode log: ${JSON.stringify(log)}`);
         }

contracts/test-utils/src/log_utils.ts

@@ -2,8 +2,6 @@ import { LogEntry, LogWithDecodedArgs, TransactionReceiptWithDecodedLogs } from
 
 import { expect } from './chai_setup';
 
-// tslint:disable no-unnecessary-type-assertion
-
 /**
  * Filter logs by event name/type.
  */

contracts/test-utils/src/mocha_blockchain.ts

@@ -8,8 +8,6 @@ import * as process from 'process';
 
 import { provider, providerConfigs, txDefaults, web3Wrapper } from './web3_wrapper';
 
-// tslint:disable: no-namespace only-arrow-functions no-unbound-method max-classes-per-file
-
 export type ISuite = mocha.ISuite;
 export type ISuiteCallbackContext = mocha.ISuiteCallbackContext;
 export type SuiteCallback = (this: ISuiteCallbackContext) => void;

contracts/test-utils/src/order_factory.ts

@@ -29,7 +29,7 @@ export class OrderFactory {
             salt: generatePseudoRandomSalt(),
             ...this._defaultOrderParams,
             ...customOrderParams,
-        } as Order; // tslint:disable-line:no-object-literal-type-assertion
+        } as Order;
         const orderHashBuff = orderHashUtils.getOrderHashBuffer(order);
         const signature = signingUtils.signMessage(orderHashBuff, this._privateKey, signatureType);
         const signedOrder = {

contracts/test-utils/src/type_encoding_utils.ts

@@ -9,7 +9,6 @@ export const typeEncodingUtils = {
         const base = 10;
         const formattedValue = new BN(value.toString(base));
         const encodedValue = ethUtil.toBuffer(formattedValue);
-        // tslint:disable-next-line:custom-no-magic-numbers
         const paddedValue = ethUtil.setLengthLeft(encodedValue, constants.WORD_LENGTH);
         return paddedValue;
     },

contracts/test-utils/src/web3_wrapper.ts

@@ -5,7 +5,6 @@ import { Web3Wrapper } from '@0x/web3-wrapper';
 import * as _ from 'lodash';
 
 import { constants } from './constants';
-import { coverage } from './coverage';
 import { profiler } from './profiler';
 import { revertTrace } from './revert_trace';
 
@@ -39,11 +38,7 @@ const enabledSubproviderCount = _.filter(
     _.identity.bind(_),
 ).length;
 if (enabledSubproviderCount > 1) {
-    throw new Error(`Only one of coverage, profiler, or revert trace subproviders can be enabled at a time`);
-}
-if (isCoverageEnabled) {
-    const coverageSubprovider = coverage.getCoverageSubproviderSingleton();
-    prependSubprovider(provider, coverageSubprovider);
+    throw new Error(`Only one of profiler or revert trace subproviders can be enabled at a time`);
 }
 if (isProfilerEnabled) {
     const profilerSubprovider = profiler.getProfilerSubproviderSingleton();

contracts/test-utils/test/mocha_blockchain.ts

@@ -13,11 +13,8 @@ blockchainTests('mocha blockchain extensions', env => {
             expect(env.provider).to.exist('');
             expect(env.txDefaults).to.exist('');
             expect(env.web3Wrapper).to.exist('');
-            // HACK(dorothy-zbornak): tslint seems to get confused by these assertions.
-            // tslint:disable: no-unbound-method
             expect(typeof env.getChainIdAsync).to.eq('function');
             expect(typeof env.getAccountAddressesAsync).to.eq('function');
-            // tslint:enable: no-unbound-method
         });
 
         it('initializes the test environment', async () => {
@@ -96,7 +93,6 @@ blockchainTests('mocha blockchain extensions', env => {
 
 function createHookedObject(obj: any, handler: (name: string) => void, methods: string[]): any {
     const hookedMethods = _.map(methods, methodName => {
-        // tslint:disable: only-arrow-functions
         return function (this: any, ...args: any[]): any {
             handler(methodName);
             return obj[methodName].call(this, ...args);

contracts/test-utils/test/order_hash_test.ts

@@ -42,7 +42,6 @@ describe('Order hashing', () => {
             // It's common for developers using javascript to provide the amounts
             // as strings. Since we eventually toString() the BigNumber
             // before encoding we should result in the same orderHash in this scenario
-            // tslint:disable-next-line:no-unnecessary-type-assertion
             const orderHash = orderHashUtils.getOrderHashHex({
                 ...order,
                 makerAssetAmount: '0',

contracts/test-utils/test/subtests/mocha_blockchain_1.ts

@@ -1,7 +1,6 @@
 import { expect } from '../../src/chai_setup';
 import { blockchainTests, BlockchainTestsEnvironment } from '../../src/mocha_blockchain';
 
-// tslint:disable: no-default-export completed-docs
 export function append(env: BlockchainTestsEnvironment): void {
     blockchainTests('imported subtests', subtestsEnv => {
         it('shares the same environment object', () => {

contracts/test-utils/test/transaction_hash.ts

@@ -35,7 +35,6 @@ describe('0x transaction hashing', () => {
             // It's common for developers using javascript to provide the amounts
             // as strings. Since we eventually toString() the BigNumber
             // before encoding we should result in the same orderHash in this scenario
-            // tslint:disable-next-line:no-unnecessary-type-assertion
             const transactionHash = transactionHashUtils.getTransactionHashHex({
                 ...transaction,
                 salt: '0',

contracts/test-utils/tsconfig.lint.json

@@ -1,7 +0,0 @@
-{
-    // This file is a workaround that issue: https://github.com/palantir/tslint/issues/4148#issuecomment-419872702
-    "extends": "./tsconfig",
-    "compilerOptions": {
-        "composite": false
-    }
-}

contracts/treasury/CHANGELOG.json

@@ -1,4 +1,67 @@
 [
+    {
+        "timestamp": 1674517560,
+        "version": "1.4.38",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1670879498,
+        "version": "1.4.37",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1669235113,
+        "version": "1.4.36",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1668477029,
+        "version": "1.4.35",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1667607537,
+        "version": "1.4.34",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1667427402,
+        "version": "1.4.33",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1666645023,
+        "version": "1.4.32",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1666381417,
         "version": "1.4.31",

contracts/treasury/CHANGELOG.md

@@ -5,6 +5,34 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v1.4.38 - _January 23, 2023_
+
+    * Dependencies updated
+
+## v1.4.37 - _December 12, 2022_
+
+    * Dependencies updated
+
+## v1.4.36 - _November 23, 2022_
+
+    * Dependencies updated
+
+## v1.4.35 - _November 15, 2022_
+
+    * Dependencies updated
+
+## v1.4.34 - _November 5, 2022_
+
+    * Dependencies updated
+
+## v1.4.33 - _November 2, 2022_
+
+    * Dependencies updated
+
+## v1.4.32 - _October 24, 2022_
+
+    * Dependencies updated
+
 ## v1.4.31 - _October 21, 2022_
 
     * Dependencies updated

contracts/treasury/README.md

@@ -16,7 +16,7 @@ We strongly recommend that the community help us make improvements and determine
 
 For proposals regarding the 0x protocol's smart contract architecture, message format, or additional functionality, go to the [0x Improvement Proposals (ZEIPs)](https://github.com/0xProject/ZEIPs) repository and follow the contribution guidelines provided therein.
 
-Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
+Please read our [contribution guidelines](../../.github/CONTRIBUTING.md) before getting started.
 
 ### Install Dependencies
 

contracts/treasury/contracts/external/ISablier.sol

@@ -36,7 +36,9 @@ interface ISablier {
 
     function balanceOf(uint256 streamId, address who) external view returns (uint256 balance);
 
-    function getStream(uint256 streamId)
+    function getStream(
+        uint256 streamId
+    )
         external
         view
         returns (

contracts/treasury/contracts/src/DefaultPoolOperator.sol

@@ -36,7 +36,7 @@ contract DefaultPoolOperator {
         stakingProxy = stakingProxy_;
         weth = weth_;
         // operator share = 100%
-        poolId = stakingProxy_.createStakingPool(10**6, false);
+        poolId = stakingProxy_.createStakingPool(10 ** 6, false);
     }
 
     /// @dev Sends this contract's entire WETH balance to the

contracts/treasury/contracts/src/IStaking.sol

@@ -81,10 +81,10 @@ interface IStaking {
     /// @param staker Owner of stake.
     /// @param stakeStatus UNDELEGATED or DELEGATED
     /// @return balance Owner's stake balances for given status.
-    function getOwnerStakeByStatus(address staker, StakeStatus stakeStatus)
-        external
-        view
-        returns (StoredBalance memory balance);
+    function getOwnerStakeByStatus(
+        address staker,
+        StakeStatus stakeStatus
+    ) external view returns (StoredBalance memory balance);
 
     /// @dev Returns the total stake delegated to a specific staking pool,
     ///      across all members.
@@ -96,8 +96,8 @@ interface IStaking {
     /// @param staker of stake.
     /// @param poolId Unique Id of pool.
     /// @return balance Stake delegated to pool by staker.
-    function getStakeDelegatedToPoolByOwner(address staker, bytes32 poolId)
-        external
-        view
-        returns (StoredBalance memory balance);
+    function getStakeDelegatedToPoolByOwner(
+        address staker,
+        bytes32 poolId
+    ) external view returns (StoredBalance memory balance);
 }

contracts/treasury/contracts/src/IZrxTreasury.sol

@@ -112,11 +112,7 @@ interface IZrxTreasury {
     /// @param operatedPoolIds The pools operated by `msg.sender`. The
     ///        ZRX currently delegated to those pools will be accounted
     ///        for in the voting power.
-    function castVote(
-        uint256 proposalId,
-        bool support,
-        bytes32[] calldata operatedPoolIds
-    ) external;
+    function castVote(uint256 proposalId, bool support, bytes32[] calldata operatedPoolIds) external;
 
     /// @dev Casts a vote for the given proposal, by signature.
     ///      Only callable during the voting period for that proposal.
@@ -159,8 +155,8 @@ interface IZrxTreasury {
     ///        ZRX currently delegated to those pools will be accounted
     ///        for in the voting power.
     /// @return votingPower The current voting power of the given account.
-    function getVotingPower(address account, bytes32[] calldata operatedPoolIds)
-        external
-        view
-        returns (uint256 votingPower);
+    function getVotingPower(
+        address account,
+        bytes32[] calldata operatedPoolIds
+    ) external view returns (uint256 votingPower);
 }

contracts/treasury/contracts/src/ZrxTreasury.sol

@@ -83,12 +83,9 @@ contract ZrxTreasury is IZrxTreasury {
         );
     }
 
-    // solhint-disable
     /// @dev Allows this contract to receive ether.
     receive() external payable {}
 
-    // solhint-enable
-
     /// @dev Updates the proposal and quorum thresholds to the given
     ///      values. Note that this function is only callable by the
     ///      treasury contract itself, so the threshold can only be
@@ -147,11 +144,7 @@ contract ZrxTreasury is IZrxTreasury {
     /// @param operatedPoolIds The pools operated by `msg.sender`. The
     ///        ZRX currently delegated to those pools will be accounted
     ///        for in the voting power.
-    function castVote(
-        uint256 proposalId,
-        bool support,
-        bytes32[] memory operatedPoolIds
-    ) public override {
+    function castVote(uint256 proposalId, bool support, bytes32[] memory operatedPoolIds) public override {
         return _castVote(msg.sender, proposalId, support, operatedPoolIds);
     }
 
@@ -222,12 +215,10 @@ contract ZrxTreasury is IZrxTreasury {
     ///        ZRX currently delegated to those pools will be accounted
     ///        for in the voting power.
     /// @return votingPower The current voting power of the given account.
-    function getVotingPower(address account, bytes32[] memory operatedPoolIds)
-        public
-        view
-        override
-        returns (uint256 votingPower)
-    {
+    function getVotingPower(
+        address account,
+        bytes32[] memory operatedPoolIds
+    ) public view override returns (uint256 votingPower) {
         uint256 delegatedBalance = stakingProxy
             .getOwnerStakeByStatus(account, IStaking.StakeStatus.DELEGATED)
             .currentEpochBalance;
@@ -310,12 +301,7 @@ contract ZrxTreasury is IZrxTreasury {
     /// @dev Casts a vote for the given proposal. Only callable
     ///      during the voting period for that proposal. See
     ///      `getVotingPower` for how voting power is computed.
-    function _castVote(
-        address voter,
-        uint256 proposalId,
-        bool support,
-        bytes32[] memory operatedPoolIds
-    ) private {
+    function _castVote(address voter, uint256 proposalId, bool support, bytes32[] memory operatedPoolIds) private {
         if (proposalId >= proposalCount()) {
             revert("_castVote/INVALID_PROPOSAL_ID");
         }

contracts/treasury/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-treasury",
-    "version": "1.4.31",
+    "version": "1.4.38",
     "engines": {
         "node": ">=6.12"
     },
@@ -23,7 +23,7 @@
         "generate_contract_wrappers": "abi-gen --debug --abis  ${npm_package_config_abis} --output test/generated-wrappers --backend ethers",
         "lint": "eslint src test",
         "fix": "eslint --fix src test",
-        "test:circleci": "yarn test",
+        "test:ci": "yarn test",
         "contracts:gen": "contracts-gen generate",
         "contracts:copy": "contracts-gen copy",
         "docs:md": "ts-doc-gen --sourceDir='$PROJECT_FILES' --output=$MD_FILE_DIR --fileExtension=mdx --tsconfig=./typedoc-tsconfig.json",
@@ -46,12 +46,12 @@
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/treasury",
     "devDependencies": {
         "@0x/abi-gen": "^5.8.1",
-        "@0x/contract-addresses": "^7.0.0",
+        "@0x/contract-addresses": "^8.0.1",
         "@0x/contracts-asset-proxy": "^3.7.19",
-        "@0x/contracts-erc20": "^3.3.48",
+        "@0x/contracts-erc20": "^3.3.55",
         "@0x/contracts-gen": "^2.0.48",
         "@0x/contracts-staking": "^2.0.45",
-        "@0x/contracts-test-utils": "^5.4.38",
+        "@0x/contracts-test-utils": "^5.4.45",
         "@0x/sol-compiler": "^4.8.2",
         "@0x/ts-doc-gen": "^0.0.28",
         "@types/isomorphic-fetch": "^0.0.35",
@@ -73,7 +73,7 @@
     },
     "dependencies": {
         "@0x/base-contract": "^7.0.0",
-        "@0x/protocol-utils": "^11.16.15",
+        "@0x/protocol-utils": "^11.17.4",
         "@0x/subproviders": "^7.0.0",
         "@0x/types": "^3.3.6",
         "@0x/typescript-typings": "^5.3.1",

contracts/utils/CHANGELOG.json

@@ -1,4 +1,67 @@
 [
+    {
+        "timestamp": 1674517560,
+        "version": "4.8.36",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1670879498,
+        "version": "4.8.35",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1669235113,
+        "version": "4.8.34",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1668477029,
+        "version": "4.8.33",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1667607537,
+        "version": "4.8.32",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1667427402,
+        "version": "4.8.31",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1666645023,
+        "version": "4.8.30",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1666381417,
         "version": "4.8.29",

contracts/utils/CHANGELOG.md

@@ -5,6 +5,34 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v4.8.36 - _January 23, 2023_
+
+    * Dependencies updated
+
+## v4.8.35 - _December 12, 2022_
+
+    * Dependencies updated
+
+## v4.8.34 - _November 23, 2022_
+
+    * Dependencies updated
+
+## v4.8.33 - _November 15, 2022_
+
+    * Dependencies updated
+
+## v4.8.32 - _November 5, 2022_
+
+    * Dependencies updated
+
+## v4.8.31 - _November 2, 2022_
+
+    * Dependencies updated
+
+## v4.8.30 - _October 24, 2022_
+
+    * Dependencies updated
+
 ## v4.8.29 - _October 21, 2022_
 
     * Dependencies updated

contracts/utils/README.md

@@ -16,7 +16,7 @@ We strongly recommend that the community help us make improvements and determine
 
 For proposals regarding the 0x protocol's smart contract architecture, message format, or additional functionality, go to the [0x Improvement Proposals (ZEIPs)](https://github.com/0xProject/ZEIPs) repository and follow the contribution guidelines provided therein.
 
-Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
+Please read our [contribution guidelines](../../.github/CONTRIBUTING.md) before getting started.
 
 ### Install Dependencies
 
@@ -63,7 +63,3 @@ yarn lint
 ```bash
 yarn test
 ```
-
-#### Testing options
-
-Contracts testing options like coverage, profiling, revert traces or backing node choosing - are described [here](../TESTING.md).

contracts/utils/contracts/src/Authorizable.sol

@@ -23,7 +23,6 @@ import "./LibAuthorizableRichErrors.sol";
 import "./LibRichErrors.sol";
 import "./Ownable.sol";
 
-// solhint-disable no-empty-blocks
 contract Authorizable is Ownable, IAuthorizable {
     /// @dev Only authorized addresses can invoke functions with this modifier.
     modifier onlyAuthorized() {

contracts/utils/contracts/src/D18.sol

@@ -23,7 +23,7 @@ library D18 {
     /// @dev Decimal places for dydx value quantities.
     uint256 private constant PRECISION = 18;
     /// @dev 1.0 in base-18 decimal.
-    int256 private constant DECIMAL_ONE = int256(10**PRECISION);
+    int256 private constant DECIMAL_ONE = int256(10 ** PRECISION);
     /// @dev Minimum signed integer value.
     int256 private constant MIN_INT256_VALUE =
         int256(0x8000000000000000000000000000000000000000000000000000000000000000);

contracts/utils/contracts/src/DeploymentConstants.sol

@@ -19,8 +19,6 @@
 pragma solidity ^0.5.9;
 
 contract DeploymentConstants {
-    // solhint-disable separate-by-one-line-in-contract
-
     // Mainnet addresses ///////////////////////////////////////////////////////
     /// @dev Mainnet address of the WETH contract.
     address private constant WETH_ADDRESS = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
@@ -60,93 +58,93 @@ contract DeploymentConstants {
     address private constant DODO_HELPER = 0x533dA777aeDCE766CEAe696bf90f8541A4bA80Eb;
 
     // // Ropsten addresses ///////////////////////////////////////////////////////
-    // /// @dev Mainnet address of the WETH contract.
+    /// @dev Mainnet address of the WETH contract.
     // address constant private WETH_ADDRESS = 0xc778417E063141139Fce010982780140Aa0cD5Ab;
-    // /// @dev Mainnet address of the KyberNetworkProxy contract.
+    /// @dev Mainnet address of the KyberNetworkProxy contract.
     // address constant private KYBER_NETWORK_PROXY_ADDRESS = 0xd719c34261e099Fdb33030ac8909d5788D3039C4;
-    // /// @dev Mainnet address of the `UniswapExchangeFactory` contract.
+    /// @dev Mainnet address of the `UniswapExchangeFactory` contract.
     // address constant private UNISWAP_EXCHANGE_FACTORY_ADDRESS = 0x9c83dCE8CA20E9aAF9D3efc003b2ea62aBC08351;
-    // /// @dev Mainnet address of the `UniswapV2Router01` contract.
+    /// @dev Mainnet address of the `UniswapV2Router01` contract.
     // address constant private UNISWAP_V2_ROUTER_01_ADDRESS = 0xf164fC0Ec4E93095b804a4795bBe1e041497b92a;
-    // /// @dev Mainnet address of the Eth2Dai `MatchingMarket` contract.
+    /// @dev Mainnet address of the Eth2Dai `MatchingMarket` contract.
     // address constant private ETH2DAI_ADDRESS = address(0);
-    // /// @dev Mainnet address of the `ERC20BridgeProxy` contract
+    /// @dev Mainnet address of the `ERC20BridgeProxy` contract
     // address constant private ERC20_BRIDGE_PROXY_ADDRESS = 0xb344afeD348de15eb4a9e180205A2B0739628339;
     // ///@dev Mainnet address of the `Dai` (multi-collateral) contract
     // address constant private DAI_ADDRESS = address(0);
-    // /// @dev Mainnet address of the `Chai` contract
+    /// @dev Mainnet address of the `Chai` contract
     // address constant private CHAI_ADDRESS = address(0);
-    // /// @dev Mainnet address of the 0x DevUtils contract.
+    /// @dev Mainnet address of the 0x DevUtils contract.
     // address constant private DEV_UTILS_ADDRESS = 0xC812AF3f3fBC62F76ea4262576EC0f49dB8B7f1c;
-    // /// @dev Kyber ETH pseudo-address.
+    /// @dev Kyber ETH pseudo-address.
     // address constant internal KYBER_ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
-    // /// @dev Mainnet address of the dYdX contract.
+    /// @dev Mainnet address of the dYdX contract.
     // address constant private DYDX_ADDRESS = address(0);
-    // /// @dev Mainnet address of the GST2 contract
+    /// @dev Mainnet address of the GST2 contract
     // address constant private GST_ADDRESS = address(0);
-    // /// @dev Mainnet address of the GST Collector
+    /// @dev Mainnet address of the GST Collector
     // address constant private GST_COLLECTOR_ADDRESS = address(0);
-    // /// @dev Mainnet address of the mStable mUSD contract.
+    /// @dev Mainnet address of the mStable mUSD contract.
     // address constant private MUSD_ADDRESS = 0x4E1000616990D83e56f4b5fC6CC8602DcfD20459;
 
     // // Rinkeby addresses ///////////////////////////////////////////////////////
-    // /// @dev Mainnet address of the WETH contract.
+    /// @dev Mainnet address of the WETH contract.
     // address constant private WETH_ADDRESS = 0xc778417E063141139Fce010982780140Aa0cD5Ab;
-    // /// @dev Mainnet address of the KyberNetworkProxy contract.
+    /// @dev Mainnet address of the KyberNetworkProxy contract.
     // address constant private KYBER_NETWORK_PROXY_ADDRESS = 0x0d5371e5EE23dec7DF251A8957279629aa79E9C5;
-    // /// @dev Mainnet address of the `UniswapExchangeFactory` contract.
+    /// @dev Mainnet address of the `UniswapExchangeFactory` contract.
     // address constant private UNISWAP_EXCHANGE_FACTORY_ADDRESS = 0xf5D915570BC477f9B8D6C0E980aA81757A3AaC36;
-    // /// @dev Mainnet address of the `UniswapV2Router01` contract.
+    /// @dev Mainnet address of the `UniswapV2Router01` contract.
     // address constant private UNISWAP_V2_ROUTER_01_ADDRESS = 0xf164fC0Ec4E93095b804a4795bBe1e041497b92a;
-    // /// @dev Mainnet address of the Eth2Dai `MatchingMarket` contract.
+    /// @dev Mainnet address of the Eth2Dai `MatchingMarket` contract.
     // address constant private ETH2DAI_ADDRESS = address(0);
-    // /// @dev Mainnet address of the `ERC20BridgeProxy` contract
+    /// @dev Mainnet address of the `ERC20BridgeProxy` contract
     // address constant private ERC20_BRIDGE_PROXY_ADDRESS = 0xA2AA4bEFED748Fba27a3bE7Dfd2C4b2c6DB1F49B;
     // ///@dev Mainnet address of the `Dai` (multi-collateral) contract
     // address constant private DAI_ADDRESS = address(0);
-    // /// @dev Mainnet address of the `Chai` contract
+    /// @dev Mainnet address of the `Chai` contract
     // address constant private CHAI_ADDRESS = address(0);
-    // /// @dev Mainnet address of the 0x DevUtils contract.
+    /// @dev Mainnet address of the 0x DevUtils contract.
     // address constant private DEV_UTILS_ADDRESS = 0x46B5BC959e8A754c0256FFF73bF34A52Ad5CdfA9;
-    // /// @dev Kyber ETH pseudo-address.
+    /// @dev Kyber ETH pseudo-address.
     // address constant internal KYBER_ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
-    // /// @dev Mainnet address of the dYdX contract.
+    /// @dev Mainnet address of the dYdX contract.
     // address constant private DYDX_ADDRESS = address(0);
-    // /// @dev Mainnet address of the GST2 contract
+    /// @dev Mainnet address of the GST2 contract
     // address constant private GST_ADDRESS = address(0);
-    // /// @dev Mainnet address of the GST Collector
+    /// @dev Mainnet address of the GST Collector
     // address constant private GST_COLLECTOR_ADDRESS = address(0);
-    // /// @dev Mainnet address of the mStable mUSD contract.
+    /// @dev Mainnet address of the mStable mUSD contract.
     // address constant private MUSD_ADDRESS = address(0);
 
     // // Kovan addresses /////////////////////////////////////////////////////////
-    // /// @dev Kovan address of the WETH contract.
+    /// @dev Kovan address of the WETH contract.
     // address constant private WETH_ADDRESS = 0xd0A1E359811322d97991E03f863a0C30C2cF029C;
-    // /// @dev Kovan address of the KyberNetworkProxy contract.
+    /// @dev Kovan address of the KyberNetworkProxy contract.
     // address constant private KYBER_NETWORK_PROXY_ADDRESS = 0x692f391bCc85cefCe8C237C01e1f636BbD70EA4D;
-    // /// @dev Kovan address of the `UniswapExchangeFactory` contract.
+    /// @dev Kovan address of the `UniswapExchangeFactory` contract.
     // address constant private UNISWAP_EXCHANGE_FACTORY_ADDRESS = 0xD3E51Ef092B2845f10401a0159B2B96e8B6c3D30;
-    // /// @dev Kovan address of the `UniswapV2Router01` contract.
+    /// @dev Kovan address of the `UniswapV2Router01` contract.
     // address constant private UNISWAP_V2_ROUTER_01_ADDRESS = 0xf164fC0Ec4E93095b804a4795bBe1e041497b92a;
-    // /// @dev Kovan address of the Eth2Dai `MatchingMarket` contract.
+    /// @dev Kovan address of the Eth2Dai `MatchingMarket` contract.
     // address constant private ETH2DAI_ADDRESS = 0xe325acB9765b02b8b418199bf9650972299235F4;
-    // /// @dev Kovan address of the `ERC20BridgeProxy` contract
+    /// @dev Kovan address of the `ERC20BridgeProxy` contract
     // address constant private ERC20_BRIDGE_PROXY_ADDRESS = 0x3577552C1Fb7A44aD76BeEB7aB53251668A21F8D;
-    // /// @dev Kovan address of the `Chai` contract
+    /// @dev Kovan address of the `Chai` contract
     // address constant private CHAI_ADDRESS = address(0);
-    // /// @dev Kovan address of the `Dai` (multi-collateral) contract
+    /// @dev Kovan address of the `Dai` (multi-collateral) contract
     // address constant private DAI_ADDRESS = 0x4F96Fe3b7A6Cf9725f59d353F723c1bDb64CA6Aa;
-    // /// @dev Kovan address of the 0x DevUtils contract.
+    /// @dev Kovan address of the 0x DevUtils contract.
     // address constant private DEV_UTILS_ADDRESS = 0x9402639A828BdF4E9e4103ac3B69E1a6E522eB59;
-    // /// @dev Kyber ETH pseudo-address.
+    /// @dev Kyber ETH pseudo-address.
     // address constant internal KYBER_ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
-    // /// @dev Kovan address of the dYdX contract.
+    /// @dev Kovan address of the dYdX contract.
     // address constant private DYDX_ADDRESS = address(0);
-    // /// @dev Kovan address of the GST2 contract
+    /// @dev Kovan address of the GST2 contract
     // address constant private GST_ADDRESS = address(0);
-    // /// @dev Kovan address of the GST Collector
+    /// @dev Kovan address of the GST Collector
     // address constant private GST_COLLECTOR_ADDRESS = address(0);
-    // /// @dev Mainnet address of the mStable mUSD contract.
+    /// @dev Mainnet address of the mStable mUSD contract.
     // address constant private MUSD_ADDRESS = address(0);
 
     /// @dev Overridable way to get the `KyberNetworkProxy` address.

contracts/utils/contracts/src/LibAddressArray.sol

@@ -117,11 +117,10 @@ library LibAddressArray {
     /// @param addressArray Array of addresses.
     /// @param target Address to search for in array.
     /// @return Existence and index of the target in the array.
-    function indexOf(address[] memory addressArray, address target)
-        internal
-        pure
-        returns (bool success, uint256 index)
-    {
+    function indexOf(
+        address[] memory addressArray,
+        address target
+    ) internal pure returns (bool success, uint256 index) {
         assembly {
             // Calculate byte length of array
             let arrayByteLen := mul(mload(addressArray), 32)

contracts/utils/contracts/src/LibAddressArrayRichErrors.sol

@@ -22,12 +22,10 @@ library LibAddressArrayRichErrors {
     // bytes4(keccak256("MismanagedMemoryError(uint256,uint256)"))
     bytes4 internal constant MISMANAGED_MEMORY_ERROR_SELECTOR = 0x5fc83722;
 
-    // solhint-disable func-name-mixedcase
-    function MismanagedMemoryError(uint256 freeMemPtr, uint256 addressArrayEndPtr)
-        internal
-        pure
-        returns (bytes memory)
-    {
+    function MismanagedMemoryError(
+        uint256 freeMemPtr,
+        uint256 addressArrayEndPtr
+    ) internal pure returns (bytes memory) {
         return abi.encodeWithSelector(MISMANAGED_MEMORY_ERROR_SELECTOR, freeMemPtr, addressArrayEndPtr);
     }
 }

contracts/utils/contracts/src/LibAuthorizableRichErrors.sol

@@ -37,7 +37,6 @@ library LibAuthorizableRichErrors {
     // bytes4(keccak256("ZeroCantBeAuthorizedError()"))
     bytes internal constant ZERO_CANT_BE_AUTHORIZED_ERROR_BYTES = hex"57654fe4";
 
-    // solhint-disable func-name-mixedcase
     function AuthorizedAddressMismatchError(address authorized, address target) internal pure returns (bytes memory) {
         return abi.encodeWithSelector(AUTHORIZED_ADDRESS_MISMATCH_ERROR_SELECTOR, authorized, target);
     }

contracts/utils/contracts/src/LibBytes.sol

@@ -50,11 +50,7 @@ library LibBytes {
     /// @param dest memory address to copy bytes to.
     /// @param source memory address to copy bytes from.
     /// @param length number of bytes to copy.
-    function memCopy(
-        uint256 dest,
-        uint256 source,
-        uint256 length
-    ) internal pure {
+    function memCopy(uint256 dest, uint256 source, uint256 length) internal pure {
         if (length < 32) {
             // Handle a partial word by reading destination and masking
             // off the bits we are interested in.
@@ -105,7 +101,6 @@ library LibBytes {
                     // Copy whole words front to back
                     // Note: the first check is always true,
                     // this could have been a do-while loop.
-                    // solhint-disable-next-line no-empty-blocks
                     for {
 
                     } lt(source, sEnd) {
@@ -140,7 +135,6 @@ library LibBytes {
                     // 2**255, so they can be safely re-interpreted as signed.
                     // Note: the first check is always true,
                     // this could have been a do-while loop.
-                    // solhint-disable-next-line no-empty-blocks
                     for {
 
                     } slt(dest, dEnd) {
@@ -163,11 +157,7 @@ library LibBytes {
     /// @param from The starting index for the slice (inclusive).
     /// @param to The final index for the slice (exclusive).
     /// @return result The slice containing bytes at indices [from, to)
-    function slice(
-        bytes memory b,
-        uint256 from,
-        uint256 to
-    ) internal pure returns (bytes memory result) {
+    function slice(bytes memory b, uint256 from, uint256 to) internal pure returns (bytes memory result) {
         // Ensure that the from and to positions are valid positions for a slice within
         // the byte array that is being used.
         if (from > to) {
@@ -201,11 +191,7 @@ library LibBytes {
     /// @param to The final index for the slice (exclusive).
     /// @return result The slice containing bytes at indices [from, to)
     /// @dev When `from == 0`, the original array will match the slice. In other cases its state will be corrupted.
-    function sliceDestructive(
-        bytes memory b,
-        uint256 from,
-        uint256 to
-    ) internal pure returns (bytes memory result) {
+    function sliceDestructive(bytes memory b, uint256 from, uint256 to) internal pure returns (bytes memory result) {
         // Ensure that the from and to positions are valid positions for a slice within
         // the byte array that is being used.
         if (from > to) {
@@ -305,11 +291,7 @@ library LibBytes {
     /// @param b Byte array to insert address into.
     /// @param index Index in byte array of address.
     /// @param input Address to put into byte array.
-    function writeAddress(
-        bytes memory b,
-        uint256 index,
-        address input
-    ) internal pure {
+    function writeAddress(bytes memory b, uint256 index, address input) internal pure {
         if (b.length < index + 20) {
             LibRichErrors.rrevert(
                 LibBytesRichErrors.InvalidByteOperationError(
@@ -378,11 +360,7 @@ library LibBytes {
     /// @param b Byte array to insert <input> into.
     /// @param index Index in byte array of <input>.
     /// @param input bytes32 to put into byte array.
-    function writeBytes32(
-        bytes memory b,
-        uint256 index,
-        bytes32 input
-    ) internal pure {
+    function writeBytes32(bytes memory b, uint256 index, bytes32 input) internal pure {
         if (b.length < index + 32) {
             LibRichErrors.rrevert(
                 LibBytesRichErrors.InvalidByteOperationError(
@@ -415,11 +393,7 @@ library LibBytes {
     /// @param b Byte array to insert <input> into.
     /// @param index Index in byte array of <input>.
     /// @param input uint256 to put into byte array.
-    function writeUint256(
-        bytes memory b,
-        uint256 index,
-        uint256 input
-    ) internal pure {
+    function writeUint256(bytes memory b, uint256 index, uint256 input) internal pure {
         writeBytes32(b, index, bytes32(input));
     }
 

contracts/utils/contracts/src/LibBytesRichErrors.sol

@@ -33,7 +33,6 @@ library LibBytesRichErrors {
     // bytes4(keccak256("InvalidByteOperationError(uint8,uint256,uint256)"))
     bytes4 internal constant INVALID_BYTE_OPERATION_ERROR_SELECTOR = 0x28006595;
 
-    // solhint-disable func-name-mixedcase
     function InvalidByteOperationError(
         InvalidByteOperationErrorCodes errorCode,
         uint256 offset,

contracts/utils/contracts/src/LibFractions.sol

@@ -62,12 +62,11 @@ library LibFractions {
     /// @param denominator The denominator.
     /// @return scaledNumerator The rescaled numerator.
     /// @return scaledDenominator The rescaled denominator.
-    function normalize(uint256 numerator, uint256 denominator)
-        internal
-        pure
-        returns (uint256 scaledNumerator, uint256 scaledDenominator)
-    {
-        return normalize(numerator, denominator, 2**127);
+    function normalize(
+        uint256 numerator,
+        uint256 denominator
+    ) internal pure returns (uint256 scaledNumerator, uint256 scaledDenominator) {
+        return normalize(numerator, denominator, 2 ** 127);
     }
 
     /// @dev Safely scales the difference between two fractions.

contracts/utils/contracts/src/LibMathRichErrors.sol

@@ -7,7 +7,6 @@ library LibMathRichErrors {
     // bytes4(keccak256("RoundingError(uint256,uint256,uint256)"))
     bytes4 internal constant ROUNDING_ERROR_SELECTOR = 0x339f3de2;
 
-    // solhint-disable func-name-mixedcase
     function DivisionByZeroError() internal pure returns (bytes memory) {
         return DIVISION_BY_ZERO_ERROR;
     }

contracts/utils/contracts/src/LibOwnableRichErrors.sol

@@ -7,7 +7,6 @@ library LibOwnableRichErrors {
     // bytes4(keccak256("TransferOwnerToZeroError()"))
     bytes internal constant TRANSFER_OWNER_TO_ZERO_ERROR_BYTES = hex"e69edc3e";
 
-    // solhint-disable func-name-mixedcase
     function OnlyOwnerError(address sender, address owner) internal pure returns (bytes memory) {
         return abi.encodeWithSelector(ONLY_OWNER_ERROR_SELECTOR, sender, owner);
     }

contracts/utils/contracts/src/LibReentrancyGuardRichErrors.sol

@@ -22,7 +22,6 @@ library LibReentrancyGuardRichErrors {
     // bytes4(keccak256("IllegalReentrancyError()"))
     bytes internal constant ILLEGAL_REENTRANCY_ERROR_SELECTOR_BYTES = hex"0c3b823f";
 
-    // solhint-disable func-name-mixedcase
     function IllegalReentrancyError() internal pure returns (bytes memory) {
         return ILLEGAL_REENTRANCY_ERROR_SELECTOR_BYTES;
     }

contracts/utils/contracts/src/LibRichErrors.sol

@@ -22,7 +22,6 @@ library LibRichErrors {
     // bytes4(keccak256("Error(string)"))
     bytes4 internal constant STANDARD_ERROR_SELECTOR = 0x08c379a0;
 
-    // solhint-disable func-name-mixedcase
     /// @dev ABI encode a standard, string revert error payload.
     ///      This is the same payload that would be included by a `revert(string)`
     ///      solidity statement. It has the function signature `Error(string)`.
@@ -32,8 +31,6 @@ library LibRichErrors {
         return abi.encodeWithSelector(STANDARD_ERROR_SELECTOR, bytes(message));
     }
 
-    // solhint-enable func-name-mixedcase
-
     /// @dev Reverts an encoded rich revert reason `errorData`.
     /// @param errorData ABI encoded error data.
     function rrevert(bytes memory errorData) internal pure {

contracts/utils/contracts/src/LibSafeMathRichErrors.sol

@@ -20,12 +20,7 @@ library LibSafeMathRichErrors {
         VALUE_TOO_LARGE_TO_DOWNCAST_TO_UINT96
     }
 
-    // solhint-disable func-name-mixedcase
-    function Uint256BinOpError(
-        BinOpErrorCodes errorCode,
-        uint256 a,
-        uint256 b
-    ) internal pure returns (bytes memory) {
+    function Uint256BinOpError(BinOpErrorCodes errorCode, uint256 a, uint256 b) internal pure returns (bytes memory) {
         return abi.encodeWithSelector(UINT256_BINOP_ERROR_SELECTOR, errorCode, a, b);
     }
 

contracts/utils/contracts/src/v06/AuthorizableV06.sol

@@ -24,7 +24,6 @@ import "./errors/LibRichErrorsV06.sol";
 import "./errors/LibAuthorizableRichErrorsV06.sol";
 import "./OwnableV06.sol";
 
-// solhint-disable no-empty-blocks
 contract AuthorizableV06 is OwnableV06, IAuthorizableV06 {
     /// @dev Only authorized addresses can invoke functions with this modifier.
     modifier onlyAuthorized() {

contracts/utils/contracts/src/v06/LibBytesV06.sol

@@ -51,11 +51,7 @@ library LibBytesV06 {
     /// @param dest memory address to copy bytes to.
     /// @param source memory address to copy bytes from.
     /// @param length number of bytes to copy.
-    function memCopy(
-        uint256 dest,
-        uint256 source,
-        uint256 length
-    ) internal pure {
+    function memCopy(uint256 dest, uint256 source, uint256 length) internal pure {
         if (length < 32) {
             // Handle a partial word by reading destination and masking
             // off the bits we are interested in.
@@ -106,7 +102,6 @@ library LibBytesV06 {
                     // Copy whole words front to back
                     // Note: the first check is always true,
                     // this could have been a do-while loop.
-                    // solhint-disable-next-line no-empty-blocks
                     for {
 
                     } lt(source, sEnd) {
@@ -141,7 +136,6 @@ library LibBytesV06 {
                     // 2**255, so they can be safely re-interpreted as signed.
                     // Note: the first check is always true,
                     // this could have been a do-while loop.
-                    // solhint-disable-next-line no-empty-blocks
                     for {
 
                     } slt(dest, dEnd) {
@@ -164,11 +158,7 @@ library LibBytesV06 {
     /// @param from The starting index for the slice (inclusive).
     /// @param to The final index for the slice (exclusive).
     /// @return result The slice containing bytes at indices [from, to)
-    function slice(
-        bytes memory b,
-        uint256 from,
-        uint256 to
-    ) internal pure returns (bytes memory result) {
+    function slice(bytes memory b, uint256 from, uint256 to) internal pure returns (bytes memory result) {
         // Ensure that the from and to positions are valid positions for a slice within
         // the byte array that is being used.
         if (from > to) {
@@ -203,11 +193,7 @@ library LibBytesV06 {
     /// @param from The starting index for the slice (inclusive).
     /// @param to The final index for the slice (exclusive).
     /// @return result The slice containing bytes at indices [from, to)
-    function sliceDestructive(
-        bytes memory b,
-        uint256 from,
-        uint256 to
-    ) internal pure returns (bytes memory result) {
+    function sliceDestructive(bytes memory b, uint256 from, uint256 to) internal pure returns (bytes memory result) {
         // Ensure that the from and to positions are valid positions for a slice within
         // the byte array that is being used.
         if (from > to) {
@@ -307,11 +293,7 @@ library LibBytesV06 {
     /// @param b Byte array to insert address into.
     /// @param index Index in byte array of address.
     /// @param input Address to put into byte array.
-    function writeAddress(
-        bytes memory b,
-        uint256 index,
-        address input
-    ) internal pure {
+    function writeAddress(bytes memory b, uint256 index, address input) internal pure {
         if (b.length < index + 20) {
             LibRichErrorsV06.rrevert(
                 LibBytesRichErrorsV06.InvalidByteOperationError(
@@ -380,11 +362,7 @@ library LibBytesV06 {
     /// @param b Byte array to insert <input> into.
     /// @param index Index in byte array of <input>.
     /// @param input bytes32 to put into byte array.
-    function writeBytes32(
-        bytes memory b,
-        uint256 index,
-        bytes32 input
-    ) internal pure {
+    function writeBytes32(bytes memory b, uint256 index, bytes32 input) internal pure {
         if (b.length < index + 32) {
             LibRichErrorsV06.rrevert(
                 LibBytesRichErrorsV06.InvalidByteOperationError(
@@ -417,11 +395,7 @@ library LibBytesV06 {
     /// @param b Byte array to insert <input> into.
     /// @param index Index in byte array of <input>.
     /// @param input uint256 to put into byte array.
-    function writeUint256(
-        bytes memory b,
-        uint256 index,
-        uint256 input
-    ) internal pure {
+    function writeUint256(bytes memory b, uint256 index, uint256 input) internal pure {
         writeBytes32(b, index, bytes32(input));
     }
 

contracts/utils/contracts/src/v06/errors/LibAuthorizableRichErrorsV06.sol

@@ -38,7 +38,6 @@ library LibAuthorizableRichErrorsV06 {
     // bytes4(keccak256("ZeroCantBeAuthorizedError()"))
     bytes internal constant ZERO_CANT_BE_AUTHORIZED_ERROR_BYTES = hex"57654fe4";
 
-    // solhint-disable func-name-mixedcase
     function AuthorizedAddressMismatchError(address authorized, address target) internal pure returns (bytes memory) {
         return abi.encodeWithSelector(AUTHORIZED_ADDRESS_MISMATCH_ERROR_SELECTOR, authorized, target);
     }

contracts/utils/contracts/src/v06/errors/LibBytesRichErrorsV06.sol

@@ -34,7 +34,6 @@ library LibBytesRichErrorsV06 {
     // bytes4(keccak256("InvalidByteOperationError(uint8,uint256,uint256)"))
     bytes4 internal constant INVALID_BYTE_OPERATION_ERROR_SELECTOR = 0x28006595;
 
-    // solhint-disable func-name-mixedcase
     function InvalidByteOperationError(
         InvalidByteOperationErrorCodes errorCode,
         uint256 offset,

contracts/utils/contracts/src/v06/errors/LibMathRichErrorsV06.sol

@@ -26,7 +26,6 @@ library LibMathRichErrorsV06 {
     // bytes4(keccak256("RoundingError(uint256,uint256,uint256)"))
     bytes4 internal constant ROUNDING_ERROR_SELECTOR = 0x339f3de2;
 
-    // solhint-disable func-name-mixedcase
     function DivisionByZeroError() internal pure returns (bytes memory) {
         return DIVISION_BY_ZERO_ERROR;
     }

contracts/utils/contracts/src/v06/errors/LibOwnableRichErrorsV06.sol

@@ -25,7 +25,6 @@ library LibOwnableRichErrorsV06 {
     // bytes4(keccak256("TransferOwnerToZeroError()"))
     bytes internal constant TRANSFER_OWNER_TO_ZERO_ERROR_BYTES = hex"e69edc3e";
 
-    // solhint-disable func-name-mixedcase
     function OnlyOwnerError(address sender, address owner) internal pure returns (bytes memory) {
         return abi.encodeWithSelector(ONLY_OWNER_ERROR_SELECTOR, sender, owner);
     }

contracts/utils/contracts/src/v06/errors/LibReentrancyGuardRichErrorsV06.sol

@@ -23,7 +23,6 @@ library LibReentrancyGuardRichErrorsV06 {
     // bytes4(keccak256("IllegalReentrancyError()"))
     bytes internal constant ILLEGAL_REENTRANCY_ERROR_SELECTOR_BYTES = hex"0c3b823f";
 
-    // solhint-disable func-name-mixedcase
     function IllegalReentrancyError() internal pure returns (bytes memory) {
         return ILLEGAL_REENTRANCY_ERROR_SELECTOR_BYTES;
     }

contracts/utils/contracts/src/v06/errors/LibRichErrorsV06.sol

@@ -23,7 +23,6 @@ library LibRichErrorsV06 {
     // bytes4(keccak256("Error(string)"))
     bytes4 internal constant STANDARD_ERROR_SELECTOR = 0x08c379a0;
 
-    // solhint-disable func-name-mixedcase
     /// @dev ABI encode a standard, string revert error payload.
     ///      This is the same payload that would be included by a `revert(string)`
     ///      solidity statement. It has the function signature `Error(string)`.
@@ -33,8 +32,6 @@ library LibRichErrorsV06 {
         return abi.encodeWithSelector(STANDARD_ERROR_SELECTOR, bytes(message));
     }
 
-    // solhint-enable func-name-mixedcase
-
     /// @dev Reverts an encoded rich revert reason `errorData`.
     /// @param errorData ABI encoded error data.
     function rrevert(bytes memory errorData) internal pure {

contracts/utils/contracts/src/v06/errors/LibSafeMathRichErrorsV06.sol

@@ -40,12 +40,7 @@ library LibSafeMathRichErrorsV06 {
         VALUE_TOO_LARGE_TO_DOWNCAST_TO_UINT128
     }
 
-    // solhint-disable func-name-mixedcase
-    function Uint256BinOpError(
-        BinOpErrorCodes errorCode,
-        uint256 a,
-        uint256 b
-    ) internal pure returns (bytes memory) {
+    function Uint256BinOpError(BinOpErrorCodes errorCode, uint256 a, uint256 b) internal pure returns (bytes memory) {
         return abi.encodeWithSelector(UINT256_BINOP_ERROR_SELECTOR, errorCode, a, b);
     }
 

contracts/utils/contracts/src/v08/AuthorizableV08.sol

@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2020 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.8;
+
+import "./interfaces/IAuthorizableV08.sol";
+import "./errors/LibRichErrorsV08.sol";
+import "./errors/LibAuthorizableRichErrorsV08.sol";
+import "./OwnableV08.sol";
+
+contract AuthorizableV08 is OwnableV08, IAuthorizableV08 {
+    /// @dev Only authorized addresses can invoke functions with this modifier.
+    modifier onlyAuthorized() {
+        _assertSenderIsAuthorized();
+        _;
+    }
+
+    // @dev Whether an address is authorized to call privileged functions.
+    // @param 0 Address to query.
+    // @return 0 Whether the address is authorized.
+    mapping(address => bool) public override authorized;
+    // @dev Whether an address is authorized to call privileged functions.
+    // @param 0 Index of authorized address.
+    // @return 0 Authorized address.
+    address[] public override authorities;
+
+    /// @dev Initializes the `owner` address.
+    constructor() OwnableV08() {}
+
+    /// @dev Authorizes an address.
+    /// @param target Address to authorize.
+    function addAuthorizedAddress(address target) external override onlyOwner {
+        _addAuthorizedAddress(target);
+    }
+
+    /// @dev Removes authorizion of an address.
+    /// @param target Address to remove authorization from.
+    function removeAuthorizedAddress(address target) external override onlyOwner {
+        if (!authorized[target]) {
+            LibRichErrorsV08.rrevert(LibAuthorizableRichErrorsV08.TargetNotAuthorizedError(target));
+        }
+        for (uint256 i = 0; i < authorities.length; i++) {
+            if (authorities[i] == target) {
+                _removeAuthorizedAddressAtIndex(target, i);
+                break;
+            }
+        }
+    }
+
+    /// @dev Removes authorizion of an address.
+    /// @param target Address to remove authorization from.
+    /// @param index Index of target in authorities array.
+    function removeAuthorizedAddressAtIndex(address target, uint256 index) external override onlyOwner {
+        _removeAuthorizedAddressAtIndex(target, index);
+    }
+
+    /// @dev Gets all authorized addresses.
+    /// @return Array of authorized addresses.
+    function getAuthorizedAddresses() external view override returns (address[] memory) {
+        return authorities;
+    }
+
+    /// @dev Reverts if msg.sender is not authorized.
+    function _assertSenderIsAuthorized() internal view {
+        if (!authorized[msg.sender]) {
+            LibRichErrorsV08.rrevert(LibAuthorizableRichErrorsV08.SenderNotAuthorizedError(msg.sender));
+        }
+    }
+
+    /// @dev Authorizes an address.
+    /// @param target Address to authorize.
+    function _addAuthorizedAddress(address target) internal {
+        // Ensure that the target is not the zero address.
+        if (target == address(0)) {
+            LibRichErrorsV08.rrevert(LibAuthorizableRichErrorsV08.ZeroCantBeAuthorizedError());
+        }
+
+        // Ensure that the target is not already authorized.
+        if (authorized[target]) {
+            LibRichErrorsV08.rrevert(LibAuthorizableRichErrorsV08.TargetAlreadyAuthorizedError(target));
+        }
+
+        authorized[target] = true;
+        authorities.push(target);
+        emit AuthorizedAddressAdded(target, msg.sender);
+    }
+
+    /// @dev Removes authorizion of an address.
+    /// @param target Address to remove authorization from.
+    /// @param index Index of target in authorities array.
+    function _removeAuthorizedAddressAtIndex(address target, uint256 index) internal {
+        if (!authorized[target]) {
+            LibRichErrorsV08.rrevert(LibAuthorizableRichErrorsV08.TargetNotAuthorizedError(target));
+        }
+        if (index >= authorities.length) {
+            LibRichErrorsV08.rrevert(LibAuthorizableRichErrorsV08.IndexOutOfBoundsError(index, authorities.length));
+        }
+        if (authorities[index] != target) {
+            LibRichErrorsV08.rrevert(
+                LibAuthorizableRichErrorsV08.AuthorizedAddressMismatchError(authorities[index], target)
+            );
+        }
+
+        delete authorized[target];
+        authorities[index] = authorities[authorities.length - 1];
+        authorities.pop();
+        emit AuthorizedAddressRemoved(target, msg.sender);
+    }
+}

contracts/utils/contracts/src/v08/LibBytesV08.sol

@@ -0,0 +1,434 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2020 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.8;
+
+import "./errors/LibBytesRichErrorsV08.sol";
+import "./errors/LibRichErrorsV08.sol";
+
+library LibBytesV08 {
+    using LibBytesV08 for bytes;
+
+    /// @dev Gets the memory address for a byte array.
+    /// @param input Byte array to lookup.
+    /// @return memoryAddress Memory address of byte array. This
+    ///         points to the header of the byte array which contains
+    ///         the length.
+    function rawAddress(bytes memory input) internal pure returns (uint256 memoryAddress) {
+        assembly ("memory-safe") {
+            memoryAddress := input
+        }
+        return memoryAddress;
+    }
+
+    /// @dev Gets the memory address for the contents of a byte array.
+    /// @param input Byte array to lookup.
+    /// @return memoryAddress Memory address of the contents of the byte array.
+    function contentAddress(bytes memory input) internal pure returns (uint256 memoryAddress) {
+        assembly ("memory-safe") {
+            memoryAddress := add(input, 32)
+        }
+        return memoryAddress;
+    }
+
+    /// @dev Copies `length` bytes from memory location `source` to `dest`.
+    /// @param dest memory address to copy bytes to.
+    /// @param source memory address to copy bytes from.
+    /// @param length number of bytes to copy.
+    function memCopy(uint256 dest, uint256 source, uint256 length) internal pure {
+        if (length < 32) {
+            // Handle a partial word by reading destination and masking
+            // off the bits we are interested in.
+            // This correctly handles overlap, zero lengths and source == dest
+            assembly {
+                let mask := sub(exp(256, sub(32, length)), 1)
+                let s := and(mload(source), not(mask))
+                let d := and(mload(dest), mask)
+                mstore(dest, or(s, d))
+            }
+        } else {
+            // Skip the O(length) loop when source == dest.
+            if (source == dest) {
+                return;
+            }
+
+            // For large copies we copy whole words at a time. The final
+            // word is aligned to the end of the range (instead of after the
+            // previous) to handle partial words. So a copy will look like this:
+            //
+            //  ####
+            //      ####
+            //          ####
+            //            ####
+            //
+            // We handle overlap in the source and destination range by
+            // changing the copying direction. This prevents us from
+            // overwriting parts of source that we still need to copy.
+            //
+            // This correctly handles source == dest
+            //
+            if (source > dest) {
+                assembly {
+                    // We subtract 32 from `sEnd` and `dEnd` because it
+                    // is easier to compare with in the loop, and these
+                    // are also the addresses we need for copying the
+                    // last bytes.
+                    length := sub(length, 32)
+                    let sEnd := add(source, length)
+                    let dEnd := add(dest, length)
+
+                    // Remember the last 32 bytes of source
+                    // This needs to be done here and not after the loop
+                    // because we may have overwritten the last bytes in
+                    // source already due to overlap.
+                    let last := mload(sEnd)
+
+                    // Copy whole words front to back
+                    // Note: the first check is always true,
+                    // this could have been a do-while loop.
+                    for {
+
+                    } lt(source, sEnd) {
+
+                    } {
+                        mstore(dest, mload(source))
+                        source := add(source, 32)
+                        dest := add(dest, 32)
+                    }
+
+                    // Write the last 32 bytes
+                    mstore(dEnd, last)
+                }
+            } else {
+                assembly {
+                    // We subtract 32 from `sEnd` and `dEnd` because those
+                    // are the starting points when copying a word at the end.
+                    length := sub(length, 32)
+                    let sEnd := add(source, length)
+                    let dEnd := add(dest, length)
+
+                    // Remember the first 32 bytes of source
+                    // This needs to be done here and not after the loop
+                    // because we may have overwritten the first bytes in
+                    // source already due to overlap.
+                    let first := mload(source)
+
+                    // Copy whole words back to front
+                    // We use a signed comparisson here to allow dEnd to become
+                    // negative (happens when source and dest < 32). Valid
+                    // addresses in local memory will never be larger than
+                    // 2**255, so they can be safely re-interpreted as signed.
+                    // Note: the first check is always true,
+                    // this could have been a do-while loop.
+                    for {
+
+                    } slt(dest, dEnd) {
+
+                    } {
+                        mstore(dEnd, mload(sEnd))
+                        sEnd := sub(sEnd, 32)
+                        dEnd := sub(dEnd, 32)
+                    }
+
+                    // Write the first 32 bytes
+                    mstore(dest, first)
+                }
+            }
+        }
+    }
+
+    /// @dev Returns a slices from a byte array.
+    /// @param b The byte array to take a slice from.
+    /// @param from The starting index for the slice (inclusive).
+    /// @param to The final index for the slice (exclusive).
+    /// @return result The slice containing bytes at indices [from, to)
+    function slice(bytes memory b, uint256 from, uint256 to) internal pure returns (bytes memory result) {
+        // Ensure that the from and to positions are valid positions for a slice within
+        // the byte array that is being used.
+        if (from > to) {
+            LibRichErrorsV08.rrevert(
+                LibBytesRichErrorsV08.InvalidByteOperationError(
+                    LibBytesRichErrorsV08.InvalidByteOperationErrorCodes.FromLessThanOrEqualsToRequired,
+                    from,
+                    to
+                )
+            );
+        }
+        if (to > b.length) {
+            LibRichErrorsV08.rrevert(
+                LibBytesRichErrorsV08.InvalidByteOperationError(
+                    LibBytesRichErrorsV08.InvalidByteOperationErrorCodes.ToLessThanOrEqualsLengthRequired,
+                    to,
+                    b.length
+                )
+            );
+        }
+
+        // Create a new bytes structure and copy contents
+        result = new bytes(to - from);
+        memCopy(result.contentAddress(), b.contentAddress() + from, result.length);
+        return result;
+    }
+
+    /// @dev Returns a slice from a byte array without preserving the input.
+    ///      When `from == 0`, the original array will match the slice.
+    ///      In other cases its state will be corrupted.
+    /// @param b The byte array to take a slice from. Will be destroyed in the process.
+    /// @param from The starting index for the slice (inclusive).
+    /// @param to The final index for the slice (exclusive).
+    /// @return result The slice containing bytes at indices [from, to)
+    function sliceDestructive(bytes memory b, uint256 from, uint256 to) internal pure returns (bytes memory result) {
+        // Ensure that the from and to positions are valid positions for a slice within
+        // the byte array that is being used.
+        if (from > to) {
+            LibRichErrorsV08.rrevert(
+                LibBytesRichErrorsV08.InvalidByteOperationError(
+                    LibBytesRichErrorsV08.InvalidByteOperationErrorCodes.FromLessThanOrEqualsToRequired,
+                    from,
+                    to
+                )
+            );
+        }
+        if (to > b.length) {
+            LibRichErrorsV08.rrevert(
+                LibBytesRichErrorsV08.InvalidByteOperationError(
+                    LibBytesRichErrorsV08.InvalidByteOperationErrorCodes.ToLessThanOrEqualsLengthRequired,
+                    to,
+                    b.length
+                )
+            );
+        }
+
+        // Create a new bytes structure around [from, to) in-place.
+        assembly {
+            result := add(b, from)
+            mstore(result, sub(to, from))
+        }
+        return result;
+    }
+
+    /// @dev Pops the last byte off of a byte array by modifying its length.
+    /// @param b Byte array that will be modified.
+    /// @return result The byte that was popped off.
+    function popLastByte(bytes memory b) internal pure returns (bytes1 result) {
+        if (b.length == 0) {
+            LibRichErrorsV08.rrevert(
+                LibBytesRichErrorsV08.InvalidByteOperationError(
+                    LibBytesRichErrorsV08.InvalidByteOperationErrorCodes.LengthGreaterThanZeroRequired,
+                    b.length,
+                    0
+                )
+            );
+        }
+
+        // Store last byte.
+        result = b[b.length - 1];
+
+        assembly ("memory-safe") {
+            // Decrement length of byte array.
+            let newLen := sub(mload(b), 1)
+            mstore(b, newLen)
+        }
+        return result;
+    }
+
+    /// @dev Tests equality of two byte arrays.
+    /// @param lhs First byte array to compare.
+    /// @param rhs Second byte array to compare.
+    /// @return equal True if arrays are the same. False otherwise.
+    function equals(bytes memory lhs, bytes memory rhs) internal pure returns (bool equal) {
+        // Keccak gas cost is 30 + numWords * 6. This is a cheap way to compare.
+        return keccak256(lhs) == keccak256(rhs);
+    }
+
+    /// @dev Reads an address from a position in a byte array.
+    /// @param b Byte array containing an address.
+    /// @param index Index in byte array of address.
+    /// @return result address from byte array.
+    function readAddress(bytes memory b, uint256 index) internal pure returns (address result) {
+        if (b.length < index + 20) {
+            LibRichErrorsV08.rrevert(
+                LibBytesRichErrorsV08.InvalidByteOperationError(
+                    LibBytesRichErrorsV08.InvalidByteOperationErrorCodes.LengthGreaterThanOrEqualsTwentyRequired,
+                    b.length,
+                    index + 20 // 20 is length of address
+                )
+            );
+        }
+
+        // Add offset to index:
+        // 1. Arrays are prefixed by 32-byte length parameter (add 32 to index)
+        // 2. Account for size difference between address length and 32-byte storage word (subtract 12 from index)
+        index += 20;
+
+        // Read address from array memory
+        assembly ("memory-safe") {
+            // 1. Add index to address of bytes array
+            // 2. Load 32-byte word from memory
+            result := mload(add(b, index))
+        }
+        return result;
+    }
+
+    /// @dev Writes an address into a specific position in a byte array.
+    /// @param b Byte array to insert address into.
+    /// @param index Index in byte array of address.
+    /// @param input Address to put into byte array.
+    function writeAddress(bytes memory b, uint256 index, address input) internal pure {
+        if (b.length < index + 20) {
+            LibRichErrorsV08.rrevert(
+                LibBytesRichErrorsV08.InvalidByteOperationError(
+                    LibBytesRichErrorsV08.InvalidByteOperationErrorCodes.LengthGreaterThanOrEqualsTwentyRequired,
+                    b.length,
+                    index + 20 // 20 is length of address
+                )
+            );
+        }
+
+        // Add offset to index:
+        // 1. Arrays are prefixed by 32-byte length parameter (add 32 to index)
+        // 2. Account for size difference between address length and 32-byte storage word (subtract 12 from index)
+        index += 20;
+
+        // Store address into array memory
+        assembly ("memory-safe") {
+            // The address occupies 20 bytes and mstore stores 32 bytes.
+            // First fetch the 32-byte word where we'll be storing the address, then
+            // apply a mask so we have only the bytes in the word that the address will not occupy.
+            // Then combine these bytes with the address and store the 32 bytes back to memory with mstore.
+
+            // 1. Add index to address of bytes array
+            // 2. Load 32-byte word from memory
+            // 3. Apply 12-byte mask to obtain extra bytes occupying word of memory where we'll store the address
+            let neighbors := and(
+                mload(add(b, index)),
+                0xffffffffffffffffffffffff0000000000000000000000000000000000000000
+            )
+
+            // Make sure input address is clean.
+            // (Solidity does not guarantee this)
+            input := and(input, 0xffffffffffffffffffffffffffffffffffffffff)
+
+            // Store the neighbors and address into memory
+            mstore(add(b, index), xor(input, neighbors))
+        }
+    }
+
+    /// @dev Reads a bytes32 value from a position in a byte array.
+    /// @param b Byte array containing a bytes32 value.
+    /// @param index Index in byte array of bytes32 value.
+    /// @return result bytes32 value from byte array.
+    function readBytes32(bytes memory b, uint256 index) internal pure returns (bytes32 result) {
+        if (b.length < index + 32) {
+            LibRichErrorsV08.rrevert(
+                LibBytesRichErrorsV08.InvalidByteOperationError(
+                    LibBytesRichErrorsV08.InvalidByteOperationErrorCodes.LengthGreaterThanOrEqualsThirtyTwoRequired,
+                    b.length,
+                    index + 32
+                )
+            );
+        }
+
+        // Arrays are prefixed by a 256 bit length parameter
+        index += 32;
+
+        // Read the bytes32 from array memory
+        assembly ("memory-safe") {
+            result := mload(add(b, index))
+        }
+        return result;
+    }
+
+    /// @dev Writes a bytes32 into a specific position in a byte array.
+    /// @param b Byte array to insert <input> into.
+    /// @param index Index in byte array of <input>.
+    /// @param input bytes32 to put into byte array.
+    function writeBytes32(bytes memory b, uint256 index, bytes32 input) internal pure {
+        if (b.length < index + 32) {
+            LibRichErrorsV08.rrevert(
+                LibBytesRichErrorsV08.InvalidByteOperationError(
+                    LibBytesRichErrorsV08.InvalidByteOperationErrorCodes.LengthGreaterThanOrEqualsThirtyTwoRequired,
+                    b.length,
+                    index + 32
+                )
+            );
+        }
+
+        // Arrays are prefixed by a 256 bit length parameter
+        index += 32;
+
+        // Read the bytes32 from array memory
+        assembly ("memory-safe") {
+            mstore(add(b, index), input)
+        }
+    }
+
+    /// @dev Reads a uint256 value from a position in a byte array.
+    /// @param b Byte array containing a uint256 value.
+    /// @param index Index in byte array of uint256 value.
+    /// @return result uint256 value from byte array.
+    function readUint256(bytes memory b, uint256 index) internal pure returns (uint256 result) {
+        result = uint256(readBytes32(b, index));
+        return result;
+    }
+
+    /// @dev Writes a uint256 into a specific position in a byte array.
+    /// @param b Byte array to insert <input> into.
+    /// @param index Index in byte array of <input>.
+    /// @param input uint256 to put into byte array.
+    function writeUint256(bytes memory b, uint256 index, uint256 input) internal pure {
+        writeBytes32(b, index, bytes32(input));
+    }
+
+    /// @dev Reads an unpadded bytes4 value from a position in a byte array.
+    /// @param b Byte array containing a bytes4 value.
+    /// @param index Index in byte array of bytes4 value.
+    /// @return result bytes4 value from byte array.
+    function readBytes4(bytes memory b, uint256 index) internal pure returns (bytes4 result) {
+        if (b.length < index + 4) {
+            LibRichErrorsV08.rrevert(
+                LibBytesRichErrorsV08.InvalidByteOperationError(
+                    LibBytesRichErrorsV08.InvalidByteOperationErrorCodes.LengthGreaterThanOrEqualsFourRequired,
+                    b.length,
+                    index + 4
+                )
+            );
+        }
+
+        // Arrays are prefixed by a 32 byte length field
+        index += 32;
+
+        // Read the bytes4 from array memory
+        assembly ("memory-safe") {
+            result := mload(add(b, index))
+        }
+        return result;
+    }
+
+    /// @dev Writes a new length to a byte array.
+    ///      Decreasing length will lead to removing the corresponding lower order bytes from the byte array.
+    ///      Increasing length may lead to appending adjacent in-memory bytes to the end of the byte array.
+    /// @param b Bytes array to write new length to.
+    /// @param length New length of byte array.
+    function writeLength(bytes memory b, uint256 length) internal pure {
+        assembly {
+            mstore(b, length)
+        }
+    }
+}

contracts/utils/contracts/src/v08/LibMathV08.sol

@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.8;
+
+import "./errors/LibRichErrorsV08.sol";
+import "./errors/LibMathRichErrorsV08.sol";
+import "./errors/LibSafeMathRichErrorsV08.sol";
+
+library LibMathV08 {
+    function max256(uint256 a, uint256 b) internal pure returns (uint256) {
+        return a >= b ? a : b;
+    }
+
+    function min256(uint256 a, uint256 b) internal pure returns (uint256) {
+        return a < b ? a : b;
+    }
+
+    function max128(uint128 a, uint128 b) internal pure returns (uint128) {
+        return a >= b ? a : b;
+    }
+
+    function min128(uint128 a, uint128 b) internal pure returns (uint128) {
+        return a < b ? a : b;
+    }
+
+    function safeDowncastToUint128(uint256 a) internal pure returns (uint128) {
+        if (a > type(uint128).max) {
+            LibRichErrorsV08.rrevert(
+                LibSafeMathRichErrorsV08.Uint256DowncastError(
+                    LibSafeMathRichErrorsV08.DowncastErrorCodes.VALUE_TOO_LARGE_TO_DOWNCAST_TO_UINT128,
+                    a
+                )
+            );
+        }
+        return uint128(a);
+    }
+
+    /// @dev Calculates partial value given a numerator and denominator rounded down.
+    ///      Reverts if rounding error is >= 0.1%
+    /// @param numerator Numerator.
+    /// @param denominator Denominator.
+    /// @param target Value to calculate partial of.
+    /// @return partialAmount Partial value of target rounded down.
+    function safeGetPartialAmountFloor(
+        uint256 numerator,
+        uint256 denominator,
+        uint256 target
+    ) internal pure returns (uint256 partialAmount) {
+        if (isRoundingErrorFloor(numerator, denominator, target)) {
+            LibRichErrorsV08.rrevert(LibMathRichErrorsV08.RoundingError(numerator, denominator, target));
+        }
+
+        partialAmount = (numerator * target) / denominator;
+        return partialAmount;
+    }
+
+    /// @dev Calculates partial value given a numerator and denominator rounded down.
+    ///      Reverts if rounding error is >= 0.1%
+    /// @param numerator Numerator.
+    /// @param denominator Denominator.
+    /// @param target Value to calculate partial of.
+    /// @return partialAmount Partial value of target rounded up.
+    function safeGetPartialAmountCeil(
+        uint256 numerator,
+        uint256 denominator,
+        uint256 target
+    ) internal pure returns (uint256 partialAmount) {
+        if (isRoundingErrorCeil(numerator, denominator, target)) {
+            LibRichErrorsV08.rrevert(LibMathRichErrorsV08.RoundingError(numerator, denominator, target));
+        }
+
+        // safeDiv computes `floor(a / b)`. We use the identity (a, b integer):
+        //       ceil(a / b) = floor((a + b - 1) / b)
+        // To implement `ceil(a / b)` using safeDiv.
+        partialAmount = (numerator * target + (denominator - 1)) / denominator;
+
+        return partialAmount;
+    }
+
+    /// @dev Calculates partial value given a numerator and denominator rounded down.
+    /// @param numerator Numerator.
+    /// @param denominator Denominator.
+    /// @param target Value to calculate partial of.
+    /// @return partialAmount Partial value of target rounded down.
+    function getPartialAmountFloor(
+        uint256 numerator,
+        uint256 denominator,
+        uint256 target
+    ) internal pure returns (uint256 partialAmount) {
+        partialAmount = (numerator * target) / denominator;
+        return partialAmount;
+    }
+
+    /// @dev Calculates partial value given a numerator and denominator rounded down.
+    /// @param numerator Numerator.
+    /// @param denominator Denominator.
+    /// @param target Value to calculate partial of.
+    /// @return partialAmount Partial value of target rounded up.
+    function getPartialAmountCeil(
+        uint256 numerator,
+        uint256 denominator,
+        uint256 target
+    ) internal pure returns (uint256 partialAmount) {
+        // safeDiv computes `floor(a / b)`. We use the identity (a, b integer):
+        //       ceil(a / b) = floor((a + b - 1) / b)
+        // To implement `ceil(a / b)` using safeDiv.
+        partialAmount = (numerator * target + (denominator - 1)) / denominator;
+
+        return partialAmount;
+    }
+
+    /// @dev Checks if rounding error >= 0.1% when rounding down.
+    /// @param numerator Numerator.
+    /// @param denominator Denominator.
+    /// @param target Value to multiply with numerator/denominator.
+    /// @return isError Rounding error is present.
+    function isRoundingErrorFloor(
+        uint256 numerator,
+        uint256 denominator,
+        uint256 target
+    ) internal pure returns (bool isError) {
+        if (denominator == 0) {
+            LibRichErrorsV08.rrevert(LibMathRichErrorsV08.DivisionByZeroError());
+        }
+
+        // The absolute rounding error is the difference between the rounded
+        // value and the ideal value. The relative rounding error is the
+        // absolute rounding error divided by the absolute value of the
+        // ideal value. This is undefined when the ideal value is zero.
+        //
+        // The ideal value is `numerator * target / denominator`.
+        // Let's call `numerator * target % denominator` the remainder.
+        // The absolute error is `remainder / denominator`.
+        //
+        // When the ideal value is zero, we require the absolute error to
+        // be zero. Fortunately, this is always the case. The ideal value is
+        // zero iff `numerator == 0` and/or `target == 0`. In this case the
+        // remainder and absolute error are also zero.
+        if (target == 0 || numerator == 0) {
+            return false;
+        }
+
+        // Otherwise, we want the relative rounding error to be strictly
+        // less than 0.1%.
+        // The relative error is `remainder / (numerator * target)`.
+        // We want the relative error less than 1 / 1000:
+        //        remainder / (numerator * denominator)  <  1 / 1000
+        // or equivalently:
+        //        1000 * remainder  <  numerator * target
+        // so we have a rounding error iff:
+        //        1000 * remainder  >=  numerator * target
+        uint256 remainder = mulmod(target, numerator, denominator);
+        isError = remainder * 1000 >= numerator * target;
+        return isError;
+    }
+
+    /// @dev Checks if rounding error >= 0.1% when rounding up.
+    /// @param numerator Numerator.
+    /// @param denominator Denominator.
+    /// @param target Value to multiply with numerator/denominator.
+    /// @return isError Rounding error is present.
+    function isRoundingErrorCeil(
+        uint256 numerator,
+        uint256 denominator,
+        uint256 target
+    ) internal pure returns (bool isError) {
+        if (denominator == 0) {
+            LibRichErrorsV08.rrevert(LibMathRichErrorsV08.DivisionByZeroError());
+        }
+
+        // See the comments in `isRoundingError`.
+        if (target == 0 || numerator == 0) {
+            // When either is zero, the ideal value and rounded value are zero
+            // and there is no rounding error. (Although the relative error
+            // is undefined.)
+            return false;
+        }
+        // Compute remainder as before
+        uint256 remainder = mulmod(target, numerator, denominator);
+        remainder = denominator - (remainder % denominator);
+        isError = remainder * 1000 >= numerator * target;
+        return isError;
+    }
+}

contracts/utils/contracts/src/v08/OwnableV08.sol

@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.8;
+
+import "./interfaces/IOwnableV08.sol";
+import "./errors/LibRichErrorsV08.sol";
+import "./errors/LibOwnableRichErrorsV08.sol";
+
+contract OwnableV08 is IOwnableV08 {
+    /// @dev The owner of this contract.
+    /// @return 0 The owner address.
+    address public override owner;
+
+    constructor() {
+        owner = msg.sender;
+    }
+
+    modifier onlyOwner() {
+        _assertSenderIsOwner();
+        _;
+    }
+
+    /// @dev Change the owner of this contract.
+    /// @param newOwner New owner address.
+    function transferOwnership(address newOwner) public override onlyOwner {
+        if (newOwner == address(0)) {
+            LibRichErrorsV08.rrevert(LibOwnableRichErrorsV08.TransferOwnerToZeroError());
+        } else {
+            owner = newOwner;
+            emit OwnershipTransferred(msg.sender, newOwner);
+        }
+    }
+
+    function _assertSenderIsOwner() internal view {
+        if (msg.sender != owner) {
+            LibRichErrorsV08.rrevert(LibOwnableRichErrorsV08.OnlyOwnerError(msg.sender, owner));
+        }
+    }
+}

contracts/utils/contracts/src/v08/ReentrancyGuardV08.sol

@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2020 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.8;
+
+import "./errors/LibReentrancyGuardRichErrorsV08.sol";
+import "./errors/LibRichErrorsV08.sol";
+
+contract ReentrancyGuardV08 {
+    // Locked state of mutex.
+    bool private _locked = false;
+
+    /// @dev Functions with this modifer cannot be reentered. The mutex will be locked
+    ///      before function execution and unlocked after.
+    modifier nonReentrant() {
+        _lockMutexOrThrowIfAlreadyLocked();
+        _;
+        _unlockMutex();
+    }
+
+    function _lockMutexOrThrowIfAlreadyLocked() internal {
+        // Ensure mutex is unlocked.
+        if (_locked) {
+            LibRichErrorsV08.rrevert(LibReentrancyGuardRichErrorsV08.IllegalReentrancyError());
+        }
+        // Lock mutex.
+        _locked = true;
+    }
+
+    function _unlockMutex() internal {
+        // Unlock mutex.
+        _locked = false;
+    }
+}