switch @0x/contract-wrappers to generated wrappers (#2037)

* switch @0x/contract-wrappers to generated wrappers

- remove TransactionEncoder
- move TokenUtils to @0x/dev-utils
- detailed changes in #2040

packages/dev-utils/CHANGELOG.json

@@ -1,4 +1,13 @@
 [
+    {
+        "version": "2.3.0",
+        "changes": [
+            {
+                "note": "Move `tokenUtils` here from `@0x/contract-wrappers`",
+                "pr": 2037
+            }
+        ]
+    },
     {
         "timestamp": 1564604963,
         "version": "2.2.6",

packages/dev-utils/src/index.ts

@@ -3,3 +3,4 @@ export { web3Factory } from './web3_factory';
 export { constants as devConstants } from './constants';
 export { env, EnvVars } from './env';
 export { callbackErrorReporter } from './callback_error_reporter';
+export { tokenUtils } from './token_utils';

packages/dev-utils/src/token_utils.ts

@@ -0,0 +1,21 @@
+// Those addresses come from migrations. They're deterministic so it's relatively safe to hard-code them here.
+// Before we were fetching them from the TokenRegistry but now we can't as it's deprecated and removed.
+// TODO(albrow): Import these from the migrations package instead of hard-coding them.
+const DUMMY_ERC_20_ADRESSES = [
+    '0x34d402f14d58e001d8efbe6585051bf9706aa064',
+    '0x25b8fe1de9daf8ba351890744ff28cf7dfa8f5e3',
+    '0xcdb594a32b1cc3479d8746279712c39d18a07fc0',
+    '0x1e2f9e10d02a6b8f8f69fcbf515e75039d2ea30d',
+    '0xbe0037eaf2d64fe5529bca93c18c9702d3930376',
+];
+
+const DUMMY_ERC_721_ADRESSES = ['0x07f96aa816c1f244cbc6ef114bb2b023ba54a2eb'];
+
+export const tokenUtils = {
+    getDummyERC20TokenAddresses(): string[] {
+        return DUMMY_ERC_20_ADRESSES;
+    },
+    getDummyERC721TokenAddresses(): string[] {
+        return DUMMY_ERC_721_ADRESSES;
+    },
+};