https://github.com/topheman/jest-esm-experiments

https://github.com/topheman/jest-esm-experiments

Last synced: about 2 months ago
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• Host: GitHub
• URL: https://github.com/topheman/jest-esm-experiments
• Owner: topheman
• Created: 2019-08-03T10:30:44.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2023-01-04T06:37:11.000Z (almost 2 years ago)
• Last Synced: 2024-04-08T00:39:39.483Z (9 months ago)
• Language: JavaScript
• Size: 782 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 11
• Metadata Files:
  • Readme: README.md

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README

        
# jest-esm-experiments

This project is a minimal reproducible bug of the [problem I encountered in my other project topheman/webrtc-experiments](https://github.com/topheman/webrtc-experiments/blob/master/NOTES.md).

```

git clone

```

## 1) Due to following error:

```

TypeError: Jest: a transform must export a `process` function.

```

**Downgrading to [email protected]** - [source](https://github.com/kenotron/esm-jest/issues/5#issuecomment-503016224)

## 2) Not working even with esm setup as loader for jest

Basic [`jest.config.js`](jest.config.js):

```js

module.exports = {

  transform: {

    "\\.m?jsx?$": "esm"

  },

  moduleNameMapper: {

    "^anotherRoot/(.*)$": "/lib/anotherRoot/$1"

  },

  transformIgnorePatterns: []

};

```

When you run `npm test`, you fill get the following error:

```

 PASS  src/common.test.js

 FAIL  src/string.test.js

  ● Test suite failed to run

    TypeError: Cannot read property 'next' of undefined

      at Object.n.(anonymous function) (node_modules/esm/esm.js:1:1796)

 FAIL  src/math.test.js

  ● Test suite failed to run

    TypeError: Cannot read property 'next' of undefined

      at Object.n.(anonymous function) (node_modules/esm/esm.js:1:1796)

Test Suites: 2 failed, 1 passed, 3 total

Tests:       1 passed, 1 total

Snapshots:   0 total

Time:        1.457s

Ran all test suites

```

This might be due to the fact that `src/common.js` file is being imported:

- directly in one of the tests

- indirectly by the components I'm testing in the 2 other tests