jest-chain-transform enables jest can transform file by multiple transformers.
npm
npm install jest-chain-transform -Dyarn
yarn add jest-chain-transform -D// jest.config.js
module.exports = {
transform: {
"\\.[jt]sx?$": [
'jest-chain-transform',
{
transformers: [
'path-of-your-custom-transformer', 'ts-jest'
]
}
]
},
}Jest will transform all files that match \\.[jt]sx?$ by path-of-your-custom-transformer and 'ts-jest' in turn.
If you need to pass extra option to transform, you can write config as follow
// jest.config.js
module.exports = {
transform: {
"\\.[jt]sx?$": [
'jest-chain-transform',
{
transformers: [
['path-of-your-custom-transformer', { ... }],
['babel-jest', { ... }]
]
}
]
},
}interface Config {
/**
* multiple transforms
* @example
* ```js
* ['babel-jest', 'ts-jest']
* [
* ['babel-jest', { }],
* ['ts-jest', { }]
* ]
* ```
*/
transformers: string[] | [string, Record<string, any>][];
}