Export default config

[tkrotoff]

Would be nice to officially export the default Jest configuration so it can be expanded.

Example:

// File jest.config.js

// See https://github.com/facebook/jest/blob/v22.4.2/packages/jest-config/src/defaults.js
const defaults = require('jest-config/build/defaults').default;

module.exports = {
  // ...
  moduleFileExtensions: [...defaults.moduleFileExtensions, 'ts', 'tsx']
  // ...
};

Line const defaults = require('jest-config/build/defaults').default works but is not very elegant (something like import { defaults } from 'jest-config' would be nice).
Also if officially supported, it should be documented.

[SimenB]

Sounds good to me. PR welcome!

Just add the export here: https://github.com/facebook/jest/blob/6979b8e27e88735bfed997d84393f291c8a0a21d/packages/jest-config/src/index.js#L24-L27

[tkrotoff]

See PR #5948

[github-actions]

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