Encountered an error when running jest test cases in Angular. All of the test suites are failing due to this issue.
The error message
typeError: (options.astTransformers || []).map is not a functionThis guide is tailored for users of Angular 8/9/10
Here are some recommended steps to resolve the issue:
If the above steps do not work, consider installing:
npm install --dev ts-jest
To resolve this issue, simply remove the specific line in your jest.config.js file that is causing the error.
module.exports = {
...
passWithNoTests: true,
projects: '<rootDir>/libs/now-version' // <--- This line was recently added and should be deleted
};
I came across this helpful solution on github. https://github.com/nrwl/nx/issues/3885#issuecomment-706620382
The error surfaced after upgrading Angular to version 11. When creating a new library within NX, this line gets automatically included by the CLI.
Appears to be an updated release of the software.
After modifying the version of jest-preset-angular from "8.3.2" to "8.2.0" in the package.json, the issue was resolved.
After making adjustments to the jest.config.js file as shown below, I was able to resolve my problem:
module.exports = {
displayName: 'UpdatedAppName',
preset: '../../modified-jest.preset.js',
setupFilesAfterEnv: ['<rootDir>/src/test-setup.ts'],
globals: {
'ts-jest': {
tsconfig: '<rootDir>/updated-tsconfig.spec.json',
stringifyContentPathRegex: '\\.(html|svg)$',
},
},
coverageDirectory: '../../coverage/libs/modifiedAppName',
transform: {
'^.+\\.(ts|mjs|js|html)$': 'jest-preset-angular-modified',
},
transformIgnorePatterns: ['node_modules/(?!.*\\.mjs$)'],
snapshotSerializers: [
'jest-preset-angular/build/serializers/no-ng-attributes',
'jest-preset-angular/build/serializers/ng-snapshot',
'jest-preset-angular/build/serializers/html-comment',
],
testRunner: 'jest-jasmine2'
};
Setting up Jest for Angular projects can be a bit tricky.
I highly recommend incorporating jest-preset-angular into your Angular project. This library will help you manage the Jest configuration specifically tailored for Angular applications.
One issue that might arise is the recent update in Jest 27, deprecating the use of astTransformers as string[].
To avoid any problems, make sure to configure your Angular project to utilize Jest 26 along with jest-preset-angular and everything should work smoothly.
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