Babel Module Resolver with Jest

 by Robin Wieruch
 - Edit this Post
babel module resolver jest

This tutorial is part 2 of 2 in the series.

Here you will learn how to use Jest with Babel Module Resolver for aliases that are defined in your .babelrc file:

{
...
"plugins": [
[
"module-resolver",
{
"root": ["./"],
"alias": {
"@components": "./src/components",
"@constants": "./src/constants",
}
}
],
]
}

In order to get the same alias mappings to Jest, the jest.config.js file needs to look like this:

module.exports = {
roots: ['<rootDir>'],
moduleFileExtensions: ['js', 'ts', 'tsx', 'json'],
testPathIgnorePatterns: ['./node_modules/'],
moduleNameMapper: {
'^@components(.*)$': '<rootDir>/src/components$1',
'^@constants(.*)$': '<rootDir>/src/constants$1',
},
testEnvironment: 'jsdom',
transform: {
'^.+\\.(js|jsx|ts|tsx)$': 'babel-jest',
},
};

Now you can use import statemes with aliases in your Jest testing environment too.

Keep reading about 

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Here you will learn how to use TypeScript with Babel Module Resolver for aliases that are defined in your .babelrc file: In order to get the same alias mappings to TypeScript, the tsconfig.json file…

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