Running react native testing 3x faster

Changwoo Yoo — Thu, 08 Feb 2024 16:51:54 +0000

I just made react-native testing 3x faster than when I was using babel-jest!

babel-jest (61s)	react-native-fast-jest (23s)

How to use?

1. Install react-native-fast-jest

npm i --save-dev react-native-fast-jest

2. Configure .swcrc on the root like below.

{
    "jsc": {
        "parser": {
            "syntax": "typescript",
            "jsx": true,
            "tsx": true,
            "dynamicImport": false,
            "privateMethod": false,
            "functionBind": false,
            "exportDefaultFrom": false,
            "exportNamespaceFrom": false,
            "decorators": false,
            "decoratorsBeforeExport": false,
            "topLevelAwait": false,
            "importMeta": false,
            "preserveAllComments": false
        },
        "transform": null,
        "target": "es5",
        "loose": true,
        "externalHelpers": false,
        "keepClassNames": false
    },
    "isModule": true
}

3. Configure jest transform config.

transform: {
  '^.+\\.(t|j)sx?$': 'react-native-fast-jest',
},

That's it!! You just made the react-native testing 3x faster!

If you're interested in the source code of the library, you can visit here: https://github.com/changwoolab/react-native-fast-jest

DEV Community: Changwoo Yoo

Running react native testing 3x faster

How to use?