johnpm-12

# I got tired of seeing examples of mongo healthchecks that weren't actually doing anything
# They appear to work only because the mongo server happens to be up by the time the first health check happens
# But they don't actually assess whether it's ok or not
# This one does

services:
  mongo-express:
    image: mongo-express:1.0
    ports:
      - 8081:8081

johnpm-12

// this function takes in an object whose values are all promises
// and returns a single promise that resolves to an object with all the same keys with resolved values
async function promiseAllObjectValues<T>(
  object: {
    [TK in keyof T]: Promise<T[TK]>;
  }
): Promise<T> {
  return Promise.all(
    Object.entries(object).map(async ([name, promise]) => [
      name,

johnpm-12

import { BigNumberish, Signature, utils, providers, Contract } from "ethers";

// this is designed to work with USDC
export async function signPermit(
  signer: providers.JsonRpcSigner,
  token: Contract,
  chainId: BigNumberish,
  spender: string,
  value: BigNumberish,
  deadline: BigNumberish

johnpm-12

import { ethers } from "ethers";

const provider = new ethers.providers.Web3Provider((window as any).ethereum);

const multiCallAddresses = {
  1: "0xeefba1e63905ef1d7acba5a8513c70307c1ce441",
  3: "0x53C43764255c17BD724F74c4eF150724AC50a3ed", // ropsten
  4: "0x42ad527de7d4e9d9d011ac45b31d8551f8fe9821", // rinkeby
  5: "0x77dca2c955b15e9de4dbbcf1246b4b85b651e50e", // goerli
  42: "0x2cc8688c5f75e365aaeeb4ea8d6a480405a48d2a", // kovan