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Check for a BigNumber instance

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This commit is contained in:
Leonid Logvinov
2017-07-03 14:26:48 -07:00
parent 8151523d33
commit 92c6144b6a
1 changed files with 8 additions and 1 deletions
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9
src/contract_wrappers/exchange_wrapper.ts
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@@ -1,6 +1,7 @@
import * as _ from 'lodash';
import * as BigNumber from 'bignumber.js';
import promisify = require('es6-promisify');
import * as Web3 from 'web3';
import {Web3Wrapper} from '../web3_wrapper';
import {
ECSignature,
@@ -601,7 +602,13 @@ export class ExchangeWrapper extends ContractWrapper {
const bignumberWrappingEventCallback = (err: Error, event: ContractEvent) => {
if (_.isNull(err)) {
const wrapIfBigNumber = (value: ContractEventArg): ContractEventArg => {
return _.isString(value) ? value : new BigNumber(value);
// HACK: The old version of BigNumber used by Web3@0.19.0 does not support the `isBigNumber`
// and checking for a BigNumber instance using `instanceof` does not work either. We therefore
// compare the constructor functions of the possible BigNumber instance and the BigNumber used by
// Web3.
const web3BigNumber = (Web3.prototype as any).BigNumber;
const isWeb3BigNumber = web3BigNumber.toString() === value.constructor.toString();
return isWeb3BigNumber ? new BigNumber(value) : value;
};
event.args = _.mapValues(event.args, wrapIfBigNumber);
}