aave-protocol-v2/helpers/misc-utils.ts

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import BigNumber from 'bignumber.js';
import BN = require('bn.js');
import low from 'lowdb';
import FileSync from 'lowdb/adapters/FileSync';
import {WAD} from './constants';
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import {Wallet, ContractTransaction} from 'ethers';
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import {BuidlerRuntimeEnvironment} from '@nomiclabs/buidler/types';
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export const toWad = (value: string | number) => new BigNumber(value).times(WAD).toFixed();
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export const bnToBigNumber = (amount: BN): BigNumber => new BigNumber(<any>amount);
export const stringToBigNumber = (amount: string): BigNumber => new BigNumber(amount);
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export const getDb = () => low(new FileSync('./deployed-contracts.json'));
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export let BRE: BuidlerRuntimeEnvironment = {} as BuidlerRuntimeEnvironment;
export const setBRE = (_BRE: BuidlerRuntimeEnvironment) => {
BRE = _BRE;
};
export const sleep = (milliseconds: number) => {
return new Promise((resolve) => setTimeout(resolve, milliseconds));
};
export const createRandomAddress = () => Wallet.createRandom().address;
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export const evmSnapshot = async () => await BRE.ethereum.send('evm_snapshot', []);
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export const evmRevert = async (id: string) => BRE.ethereum.send('evm_revert', [id]);
export const timeLatest = async () => {
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const block = await BRE.ethers.provider.getBlock('latest');
return new BigNumber(block.timestamp);
};
export const advanceBlock = async (timestamp: number) =>
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await BRE.ethers.provider.send('evm_mine', [timestamp]);
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export const increaseTime = async (secondsToIncrease: number) => {
await BRE.ethers.provider.send('evm_increaseTime', [secondsToIncrease]);
await BRE.ethers.provider.send('evm_mine', []);
};
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export const waitForTx = async (tx: ContractTransaction) => await tx.wait();
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export const filterMapBy = (raw: {[key: string]: any}, fn: (key: string) => boolean) =>
Object.keys(raw)
.filter(fn)
.reduce<{[key: string]: any}>((obj, key) => {
obj[key] = raw[key];
return obj;
}, {});