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author | Fabio Berger <me@fabioberger.com> | 2017-05-25 16:58:40 +0800 |
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committer | Fabio Berger <me@fabioberger.com> | 2017-05-25 16:58:40 +0800 |
commit | 755c980a56385f2fe4198b5d4a312d7af0eab02c (patch) | |
tree | 60b53698073d403d2a02f355dcae348c84a34333 /src/ts/utils/assert.ts | |
parent | 140a160ba0627f80f998555438df1d797c75380e (diff) | |
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Add assertions library and add them for all function args
Diffstat (limited to 'src/ts/utils/assert.ts')
-rw-r--r-- | src/ts/utils/assert.ts | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/ts/utils/assert.ts b/src/ts/utils/assert.ts new file mode 100644 index 000000000..a29ae922d --- /dev/null +++ b/src/ts/utils/assert.ts @@ -0,0 +1,31 @@ +import * as _ from 'lodash'; +import * as BigNumber from 'bignumber.js'; +import Web3 = require('web3'); + +export const assert = { + isBigNumber(variableName: string, value: BigNumber.BigNumber) { + const isBigNumber = _.isObject(value) && value.isBigNumber; + this.assert(isBigNumber, this.typeAssertionMessage(variableName, 'BigNumber', value)); + }, + isString(variableName: string, value: string) { + this.assert(_.isString(value), this.typeAssertionMessage(variableName, 'string', value)); + }, + isETHAddressHex(variableName: string, value: ETHAddressHex) { + const web3 = new Web3(); + this.assert(web3.isAddress(value), this.typeAssertionMessage(variableName, 'ETHAddressHex', value)); + }, + isObject(variableName: string, value: object) { + this.assert(_.isObject(value), this.typeAssertionMessage(variableName, 'object', value)); + }, + isNumber(variableName: string, value: number) { + this.assert(_.isFinite(value), this.typeAssertionMessage(variableName, 'number', value)); + }, + assert(condition: boolean, message: string) { + if (!condition) { + throw new Error(message); + } + }, + typeAssertionMessage(variableName: string, type: string, value: any) { + return `Expected ${variableName} to be of type ${type}, encountered: ${value}`; + }, +}; |