README.md

Using the “JS for impatient programmers” exercise setup with latest language features

Instructions:

• Replace the existing package.json with the file shown here.
• Execute in the shell:

  cd impatient-js-code*
  rm -rf node_modules
  npm install
  

• If you move nullish-coalescing_test.mjs into the directory, you can run it as follows:

  npm t nullish-coalescing_test.mjs
  

nullish-coalescing_test.mjs

import test from 'ava';
import * as assert from 'assert/strict';

test('nullish coalescing operator', () => {
  assert.equal(undefined ?? 'abc', 'abc');
});

package.json

{
  "author": "Axel Rauschmayer",
  "private": true,
  "scripts": {
    "test": "ava --match \"!*#bonus\"",
    "testall": "ava",
    "serve": "http-server test_data/"
  },
  "// dependencies": [
    "http-server is needed for fetch_json_test.mjs and fetch_json_test2.mjs",
    "isomorphic-fetch is needed for fetch_json_test.mjs and fetch_json_test2.mjs"
  ],
  "dependencies": {
    "ava": "^3.15.0",
    "esm": "^3.2.25",
    "http-server": "^0.12.3",
    "isomorphic-fetch": "^3.0.0"
  },
  "// ava": [
    "failWithoutAssertions must be false, because assert.* is not tracked by AVA",
    "esm is needed to run ESM-based tests on older Node.js versions"
  ],
  "ava": {
    "files": [
      "**/*.mjs"
    ],
    "extensions": [
      "mjs"
    ],
    "require": [
      "esm"
    ],
    "failWithoutAssertions": false
  }
}

I had to change the second import to:
import {strict as assert} from 'assert';

Other than that, it worked great. Thanks!