Buidler + Waffle + Ethers on Node >= 12

buidler.config.ts

import { ethers } from "@nomiclabs/buidler";
import { task, usePlugin, BuidlerConfig } from "@nomiclabs/buidler/config";
import { getWallets, defaultAccounts } from "ethereum-waffle";

usePlugin("@nomiclabs/buidler-ethers");

task("accounts", "Prints the list of accounts", async (taskArgs, env) => {
  const accounts = await getWallets(ethers.provider);

  for (const account of accounts) {
    console.log(account);
  }
});

const config: BuidlerConfig = {
  defaultNetwork: "buidlerevm",
  networks: {
    buidlerevm: {
      accounts: defaultAccounts.map(acc => ({
        balance: acc.balance,
        privateKey: acc.secretKey
      }))
    }
  }
};

export default config;

not-working-package.json

{
  "name": "buidler-labs",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "devDependencies": {
    "@nomiclabs/buidler": "^1.0.1",
    "@nomiclabs/buidler-ethers": "^1.0.1",
    "@nomiclabs/buidler-truffle5": "^1.0.1",
    "@nomiclabs/buidler-web3": "^1.0.1",
    "@types/mocha": "^5.2.7",
    "@types/node": "^12.11.7",
    "ethereum-waffle": "^2.1.0",
    "ethers": "^4.0.38",
    "ts-node": "^8.4.1",
    "typescript": "^3.6.4",
    "web3": "^1.2.2"
  }
}

working-package.json

{
  "name": "buidler-labs",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "devDependencies": {
    "@nomiclabs/buidler": "^1.0.1",
    "@nomiclabs/buidler-ethers": "^1.0.1",
    "@types/mocha": "^5.2.7",
    "@types/node": "^12.11.7",
    "ethereum-waffle": "^2.1.0",
    "ethers": "^4.0.38",
    "ts-node": "^8.4.1",
    "typescript": "^3.6.4"
  }
}