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Jest

craco.config.js
module.exports = {
  // ...
  jest: {
    babel: {
      addPresets: true /* (default value) */,
      addPlugins: true /* (default value) */,
    },
    configure: { /* ... */ },
    configure: (jestConfig, { env, paths, resolve, rootDir }) => {
      /* ... */
      return jestConfig;
    },
  },
};
tip

Properties listed twice in the outline above (for example, configure) can be assigned an object literal or a function. See configuration tips for details.

jest.babel​

Configuration options for the babel-jest transformer: https://jestjs.io/docs/code-transformation

jest.babel.addPresets​

boolean = true

Whether or not Babel presets should be added.

jest.babel.addPlugins​

boolean = true

Whether or not Babel plugins should be added.

jest.configure​

JestConfig or (config: JestConfig, { env, paths, resolve, rootDir }) => JestConfig

Any Jest configuration options: https://jestjs.io/docs/configuration

The function version of configure provides two extra properties within the context object:

  • resolve - provided by CRA
  • rootDir - provided by CRA