Jest transformIgnorePatterns not working

问题

I have spent a long time looking at other questions about this and looking at other projects on Github but none of the answers seem to work for me.

I am loading a third party library in my project, and when running Jest tests I get the error

export default portalCommunication;
^^^^^^

SyntaxError: Unexpected token export

> 1 | import portalCommunication from 'mathletics-portal-communication-service';

I have tried updating my Jest config in many ways to get it to transpile this library but I always get the same error.

This is my current jest.config.js file:

module.exports = {
    moduleNameMapper: {
        '\\.(css|scss)$': 'identity-obj-proxy',
        '\\.svg$': '<rootDir>/test/mocks/svg-mock.js'
    },
    setupFiles: ['./test/test-setup.js'],
    transformIgnorePatterns: [
        '<rootDir>/node_modules/(?!mathletics-portal-communication-service)'
    ]
};

I have also tried adding the transform property to run babel-jest against this mathletics-portal-communication-service directory.

Please help!

回答1:

The transformIgnorePatterns didn't work for me until I changed my .babelrc to babel.config.js, like this:

module.exports = {
    "presets": [
        "@babel/preset-env"
    ]
};

as seen on this comment: https://github.com/facebook/jest/issues/6229#issuecomment-403539460

回答2:

As a workaround for now I have changed my config to use the moduleNameMapper option to load a mock class for that library instead. I would have preferred to use transformIgnorePatterns instead so would still appreciate any ideas.

New config:

module.exports = {
    moduleNameMapper: {
        '\\.(css|scss)$': 'identity-obj-proxy',
        '\\.svg$': '<rootDir>/test/mocks/svg-mock.js',
        'mathletics-portal-communication-service': '<rootDir>/test/mocks/mathletics-portal-communication-service-mock.js'
    },
    setupFiles: ['./test/test-setup.js']
};

回答3:

It might be your use of rootDir. Try:

    "transformIgnorePatterns": [
      "node_modules/(?!(mathletics-portal-communication-service))"
    ]

来源：https://stackoverflow.com/questions/50147915/jest-transformignorepatterns-not-working

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javascript

reactjs

jestjs

babel-jest