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import * as _ from 'lodash';
import * as BigNumber from 'bignumber.js';
import Web3 = require('web3');
const HEX_REGEX = /^0x([0-9A-F]{2})*$/i;
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));
},
isHexString(variableName: string, value: string) {
this.assert(_.isString(value) && HEX_REGEX.test(value),
this.typeAssertionMessage(variableName, 'HexString', 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}`;
},
};
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