jest-preset-angular

Bug Fixes

• support all node versions >= 12.13.0 (#923) (96782a6), closes #920
• presets: remove moduleNameMapper config (#910) (df482bc), closes #908

Features

• support Jest 27 (#926) (1c761f8)
• config: load zone ESM when running jest in ESM mode (#892) (e03ec19), closes #751
• add exports field to package.json, see https://nodejs.org/api/packages.html#packages_package_entry_points
• presets: add type definition for presets entry point (#801) (e4ff0c0)
• compiler: support ESM (#721) (a2166f8)
• presets: add ESM preset (#723) (b0073b0)
• compiler: use replace-resources AST transformer from Angular (#708) (1b20c19)
• compiler: use downlevel-ctor AST transformer from Angular (#730) (1f964c3)

Performance Improvements

• compiler: reuse cacheFS from jest to reduce file system reading (#679) (f5d9d4b)
• config: set skipLibCheck: true if not defined in tsconfig (#678) (0df3ce1)

BREAKING CHANGES

• Drop support for Angular < 8.0, see https://angular.io/guide/releases#support-policy-and-schedule.
• Drop support for Node.js version 10 since it becomes EOL on 2021-04-30. Required Node version now is >=12.13.0.
• Require Jest 27.
• Users who are using import 'jest-preset-angular' should change to import 'jest-preset-angular/setup-jest'
• transformers: The AST transformers InlineFilesTransformer and StripStylesTransformer are REMOVED and
  default jest-preset-angular uses AST transformers from @angular/compiler-cli and @ngtools/webpack.
  One should remove the old transformers from the jest config.
• compiler: jest-preset-angular now switches to default to use its own transformer which wraps around ts-jest to transform codes.

Users who are currently doing in jest config

// jest.config.js
module.exports = {
    // [...]
    transform: {
      '^.+\\.(ts|js|html)$': 'ts-jest',
    },
}

should change to

// jest.config.js
module.exports = {
    // [...]
    transform: {
      '^.+\\.(ts|js|html)$': 'jest-preset-angular',
    },
}

• serializers:: snapshot serializer paths have been changed:
  • 'jest-preset-angular/build/AngularNoNgAttributesSnapshotSerializer.js' is changed to 'jest-preset-angular/build/serializers/no-ng-attributes.
  • 'jest-preset-angular/build/AngularSnapshotSerializer.js' is changed to 'jest-preset-angular/build/serializers/ng-snapshot.
  • 'jest-preset-angular/build/HTMLCommentSerializer.js' is changed to 'jest-preset-angular/build/serializers/html-comment.
• When generating a new project from Angular CLI, by default the tsconfig.json doesn't contain any path mappings
  hence removing moduleNameMapper from preset will make sure that the preset works in pair with tsconfig.json.
  Ones who are relying on the value of moduleNameMapper from the preset should create their own moduleNameMapper
  config manually or via ts-jest util https://kulshekhar.github.io/ts-jest/docs/getting-started/paths-mapping
• By default, if skipLibCheck is not defined in tsconfig, jest-preset-angular will set it to true. If one wants to have it as false, one can set explicitly in tsconfig.
• compiler: jest-preset-angular now switches to default to use its own transformer which wraps around ts-jest to transform codes.

Users who are currently doing in jest config

// jest.config.js
module.exports = {
    // [...]
    transform: {
      '^.+\\.(ts|js|html)$': 'ts-jest',
    },
}

should change to

// jest.config.js
module.exports = {
    // [...]
    transform: {
      '^.+\\.(ts|js|html)$': 'jest-preset-angular',
    },
}