https://github.com/joscha/ts-jest-transformer

A base class that can be used to implement a transformer for use with ts-jest
https://github.com/joscha/ts-jest-transformer

jest testing transformer ts-jest typescript

Last synced: 5 months ago
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A base class that can be used to implement a transformer for use with ts-jest

• Host: GitHub
• URL: https://github.com/joscha/ts-jest-transformer
• Owner: joscha
• License: mit
• Created: 2017-03-14T12:15:11.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2020-05-30T20:15:53.000Z (about 6 years ago)
• Last Synced: 2025-09-12T20:22:24.891Z (10 months ago)
• Topics: jest, testing, transformer, ts-jest, typescript
• Language: JavaScript
• Size: 3.33 MB
• Stars: 0
• Watchers: 1
• Forks: 1
• Open Issues: 6
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# `ts-jest` transformer base class

[![Build Status](https://travis-ci.org/joscha/ts-jest-transformer.svg?branch=master)](https://travis-ci.org/joscha/ts-jest-transformer)

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A base class that can be used to implement a transformer for use with [ts-jest](https://github.com/kulshekhar/ts-jest).

## Usage

Run

```console

yarn add ts-jest-transformer --dev

```

then create your custom transformer:

```js

// my-transformer.js

const path = require('path');

const TsJestTransformer = require('ts-jest-transformer');

class MyFileBaseNameTransformer extends TsJestTransformer {

    process(src, filename, config, options) {

        // Write TS here

        const source = 'export default ' + JSON.stringify(path.basename(filename)) + ';';

        return super.process(source, filename, config, options);

    }

}

module.exports = new MyFileBaseNameTransformer();

```

and finally add the according `jest` config:

```json

{

    "transform": {

        "\\.(svg)$": "/my-transformer.js",

        "\\.(ts|tsx)$": "/node_modules/ts-jest/preprocessor.js"

    },

    "testRegex": "(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$",

    "moduleFileExtensions": [

        "ts",

        "tsx",

        "js"

    ]

}

```

## Example

For a more complete example, you can have a look at the [ts-jest-transformer-example](https://github.com/joscha/ts-jest-transformer-example) repository.