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metamask-extension/jest.config.js
Erik Marks 3de3765425
Add build-time code exclusion using code fencing (#12060)
This PR adds build-time code exclusion by means of code fencing. For details, please see the README in `./development/build/transforms`. Note that linting of transformed files as a form of validation is added in a follow-up, #12075.

Hopefully exhaustive tests are added to ensure that the transform works according to its specification. Since these tests are Node-only, they required their own Jest config. The recommended way to work with multiple Jest configs is using the `projects` field in the Jest config, however [that feature breaks coverage collection](https://github.com/facebook/jest/issues/9628). That being the case, I had to set up two separate Jest configs. In order to get both test suites to run in parallel, Jest is now invoked via a script, `./test/run-jest.sh`.

By way of example, this build system feature allows us to add fences like this:

```javascript
this.store.updateStructure({
  ...,
  GasFeeController: this.gasFeeController,
  TokenListController: this.tokenListController,
  ///: BEGIN:ONLY_INCLUDE_IN(beta)
  PluginController: this.pluginController,
  ///: END:ONLY_INCLUDE_IN
});
```

Which at build time are transformed to the following if the build type is not `beta`:

```javascript
this.store.updateStructure({
  ...,
  GasFeeController: this.gasFeeController,
  TokenListController: this.tokenListController,
});
```

Co-authored-by: Mark Stacey <markjstacey@gmail.com>
2021-09-14 10:00:04 -07:00

23 lines
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JavaScript

module.exports = {
displayName: '/ui, /shared',
collectCoverageFrom: ['<rootDir>/ui/**/*.js', '<rootDir>/shared/**/*.js'],
coverageDirectory: './jest-coverage/main',
coveragePathIgnorePatterns: ['.stories.js', '.snap'],
coverageReporters: ['json', 'lcov', 'text', 'clover'],
coverageThreshold: {
global: {
branches: 35,
functions: 37,
lines: 43,
statements: 43,
},
},
// TODO: enable resetMocks
// resetMocks: true,
restoreMocks: true,
setupFiles: ['<rootDir>/test/setup.js', '<rootDir>/test/env.js'],
setupFilesAfterEnv: ['<rootDir>/test/jest/setup.js'],
testMatch: ['<rootDir>/ui/**/*.test.js', '<rootDir>/shared/**/*.test.js'],
testTimeout: 2500,
};