A fast jest transform

README
Issues 3

esjest-transform

(DEPRECATED, use esbuild-jest instead)

A fast jest transform.

module.exports = {
  // ...
  transform: {
    "\\.[jt]sx?$": "esjest-transform",
  },
  // ...
};

2 Open More issues

Closed

Test doesn't run when it has spread props in the test

● Test suite failed to run

    SyntaxError: /Users/haroen.viaene/Developer/algolia/instantsearch.js/src/components/GeoSearchControls/__tests__/GeoSearchToggle-test.js: Unexpected token, expected "," (21:23)

      19 |
      20 |     const wrapper = shallow(
    > 21 |       <GeoSearchToggle {...props}>
         |                        ^
      22 |         Clear the current map refinement
      23 |       </GeoSearchToggle>
      24 |     );

      at Object._raise (node_modules/esjest-transform/node_modules/@babel/parser/src/parser/error.js:97:45)

babel config:

/* eslint-disable import/no-commonjs */

const wrapWarningWithDevCheck = require('./scripts/babel/wrap-warning-with-dev-check');

const isCJS = process.env.BABEL_ENV === 'cjs';
const isES = process.env.BABEL_ENV === 'es';
const isUMD = process.env.BABEL_ENV === 'umd';

const clean = x => x.filter(Boolean);

module.exports = api => {
  const isTest = api.env('test');
  const modules = isTest || isCJS ? 'commonjs' : false;
  const targets = {};

  if (isTest) {
    targets.node = true;
  } else {
    targets.browsers = ['last 2 versions', 'ie >= 9'];
  }

  const testPlugins = [
    '@babel/plugin-proposal-class-properties',
    wrapWarningWithDevCheck,
  ];

  const buildPlugins = clean([
    '@babel/plugin-proposal-class-properties',
    '@babel/plugin-transform-react-constant-elements',
    [
      'babel-plugin-transform-react-remove-prop-types',
      {
        mode: 'remove',
        removeImport: true,
      },
    ],
    'babel-plugin-transform-react-pure-class-to-function',
    wrapWarningWithDevCheck,
    (isCJS || isES) && [
      'inline-replace-variables',
      {
        __DEV__: {
          type: 'node',
          replacement: "process.env.NODE_ENV === 'development'",
        },
      },
    ],
    // this plugin is used to test if we need polyfills, not to actually insert them
    // only UMD, since cjs & esm have false positives due to imports
    isUMD && [
      'polyfill-es-shims',
      {
        method: 'usage-global',
        targets: {
          ie: 11,
        },
        shouldInjectPolyfill(name, defaultShouldInject) {
          const exclude = [
            // false positives (we access these from objects only)
            'Array.prototype.item',
            'String.prototype.item',
            'Array.prototype.values',
            'Function.prototype.name',

            // we require polyfills for this already
            'Array.prototype.includes',
            // false positive (babel doesn't know types)
            // this is actually only called on arrays
            'String.prototype.includes',
          ];
          if (defaultShouldInject && !exclude.includes(name)) {
            throw new Error(
              `Usage of a builtin which isn't allowed to be polyfilled: ${name}`
            );
          }
          return false;
        },
      },
    ],
  ]);

  return {
    presets: [
      '@babel/preset-typescript',
      '@babel/preset-react',
      [
        '@babel/preset-env',
        {
          modules,
          targets,
        },
      ],
    ],
    plugins: isTest ? testPlugins : buildPlugins,
  };
};

opened Feb 18, 2021 by Haroenv 4

Open

No real benefit in terms of speed

I ran this in on my work setup, which is a windows VM and couldn't see any real benefits of switching over to esjest-transform or esbuild-jest. All the test's ran without issues which is roughly about 700 test's. Using the babel transformations, I was seeing about 5 minutes after cleaning the cache. With esjest-transform it went beyond the 5 minute mark.

opened Feb 25, 2021 by nimeshgurung 3

Open

can not find jest globals in tests using jest/require.requireActual

 FAIL  src/widgets/pagination/__tests__/pagination-test.js
  ● Test suite failed to run

    Cannot find module '@jest/globals' from 'pagination-test.js'

      23 | });
      24 | 
    > 25 | describe('Usage', () => {
         |       ^
      26 |   it('throws without container', () => {
      27 |     expect(() => {
      28 |       pagination({ container: undefined });

      at Resolver.resolveModule (node_modules/jest-resolve/build/index.js:276:11)
      at _getJestObj (src/widgets/pagination/__tests__/pagination-test.js:25:7)
      at Object.<anonymous> (src/widgets/pagination/__tests__/pagination-test.js:8:1)

this didn't happen in every test, and on different spots in the code, some describe, some expect, some an unrelated code point

opened Feb 18, 2021 by Haroenv 6