Move more shared utils into utils package and reuse them

packages/contracts/package.json

@@ -29,6 +29,7 @@
   },
   "homepage": "https://github.com/0xProject/0x.js/packages/contracts/README.md",
   "devDependencies": {
+    "@0xproject/dev-utils": "^0.0.1",
     "@0xproject/tslint-config": "^0.2.1",
     "@0xproject/types": "^0.1.0",
     "@types/bluebird": "^3.5.3",

packages/contracts/test/ts/multi_sig_with_time_lock.ts

@@ -1,13 +1,14 @@
+import {RPC} from '@0xproject/dev-utils';
 import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as chai from 'chai';
 import Web3 = require('web3');
 
 import * as multiSigWalletJSON from '../../build/contracts/MultiSigWalletWithTimeLock.json';
+import * as truffleConf from '../../truffle.js';
 import {Artifacts} from '../../util/artifacts';
 import {constants} from '../../util/constants';
 import {MultiSigWrapper} from '../../util/multi_sig_wrapper';
-import {RPC} from '../../util/rpc';
 import {ContractInstance} from '../../util/types';
 
 import {chaiSetup} from './utils/chai_setup';
@@ -38,7 +39,8 @@ contract('MultiSigWalletWithTimeLock', (accounts: string[]) => {
 
         const secondsTimeLocked = await multiSig.secondsTimeLocked.call();
         initialSecondsTimeLocked = secondsTimeLocked.toNumber();
-        rpc = new RPC();
+        const rpcUrl = `http://${truffleConf.networks.development.host}:${truffleConf.networks.development.port}`;
+        rpc = new RPC(rpcUrl);
     });
 
     describe('changeTimeLock', () => {

packages/contracts/util/balances.ts

@@ -1,7 +1,7 @@
+import {bigNumberConfigs} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as _ from 'lodash';
 
-import {bigNumberConfigs} from './bignumber_config';
 import {BalancesByOwner, ContractInstance} from './types';
 
 bigNumberConfigs.configure();

packages/contracts/util/bignumber_config.ts

@@ -1,11 +0,0 @@
-import {BigNumber} from 'bignumber.js';
-
-export const bigNumberConfigs = {
-    configure() {
-        // By default BigNumber's `toString` method converts to exponential notation if the value has
-        // more then 20 digits. We want to avoid this behavior, so we set EXPONENTIAL_AT to a high number
-        BigNumber.config({
-            EXPONENTIAL_AT: 1000,
-        });
-    },
-};

packages/contracts/util/rpc.ts

@@ -1,43 +0,0 @@
-import 'isomorphic-fetch';
-
-import * as truffleConf from '../truffle.js';
-
-export class RPC {
-    private host: string;
-    private port: number;
-    private id: number;
-    constructor() {
-        this.host = truffleConf.networks.development.host;
-        this.port = truffleConf.networks.development.port;
-        this.id = 0;
-    }
-    public async increaseTimeAsync(time: number) {
-        const method = 'evm_increaseTime';
-        const params = [time];
-        const payload = this.toPayload(method, params);
-        return this.sendAsync(payload);
-    }
-    public async mineBlockAsync() {
-        const method = 'evm_mine';
-        const payload = this.toPayload(method);
-        return this.sendAsync(payload);
-    }
-    private toPayload(method: string, params: any[] = []) {
-        const payload = JSON.stringify({
-            id: this.id,
-            method,
-            params,
-        });
-        this.id++;
-        return payload;
-    }
-    private async sendAsync(payload: string): Promise<any> {
-        const opts = {
-            method: 'POST',
-            body: payload,
-        };
-        const response = await fetch(`http://${this.host}:${this.port}`, opts);
-        const responsePayload = await response.json();
-        return responsePayload;
-    }
-}