As such, if you make use of webpack 2, you will most likely want to configure Babel to transpile ES modules to CommonJS modules only in the test environment. However, we know that Jest runs in Node, and thus will require that ES modules be transpiled to CommonJS modules. Using TypeScript's absolute paths in Create React App 2. webpack 2 provides native support for ES modules. ![]() Use typescript module resolve in create-react-native-appĬreating path aliases in create-react-app with react-app-rewired "moduleDirectories" :, "moduleNameMapper" : are not taken into considerationĬreate-react-app Typescript 3.5, Path Alias "node_modules. \\.(js|jsx|ts|tsx)$",Īnd this is import Adapter from 'enzyme-adapter-react-16' moduleNameMapper expects to see module with index.js under mentioned path, still webpacks resolve.alias work in another way - it just substitutes file path to. Simple javascript unit tests are working properly But the test configuration is not working properly for unit tests of React components. "^. \\.(css|scss)$": "/config/jest/cssTransform.js", based on some aliases built in Now, I am installing a Jest environment to write tests both for simple javascript files and also for React components. Here’s our work in action (from user. This will help us to create a single source of truth regarding our aliases. If you take a look at the build/, it has already defined. Again, we have a solution We need an extra package: npm i tsconfig-paths-webpack-plugin -D. "/src/app/**/?(*.) (spec|test).(js|ts)?(x)" You just need to add a resolve.alias property in your webpack configuration. Preprocessor for Jest that is able to resolve require() statements using webpack aliases - jest-webpack-alias/package. Eslint Eslint will also be yelling at you at this point with something like Unable to resolve path to module This can be solved with a small library called eslint-import-resolver-alias. Install npm install -save-dev jest-webpack-alias Setup File tests/preprocessor. After doing that your tests should now run as Jest will have the same mapping to the aliased component as Webpack. An example setup can be seen at the Next.js repo. Consider using babel-plugin-module-resolver for new projects instead of jest-webpack-alias. ![]() TypeError: Cannot read property 'duration' of undefined jest-webpack-alias Preprocessor for Jest that is able to resolve require () statements using webpack aliases. ScssConfig is an alias configured in the but in the Jest environment, when executing jest -config, an error pops out because the required file is not read / found and when I try to access its content, this is the error displayed coming out of the line const durationConfig = motionConfig.duration Why webpack 2 provides some custom resolving opinions for enchanging resolving behaviours like directory-named-webpack-plugin and you can't match this kind of resolves with jest's default resolver and this plugins completely changing resolving rules. const motionConfig = require(`scssConfig/shared/motions.scss`) It is a jest plugin for enchanging jest resolving behaviour to webpack resolver through any webpack config. What is not working is the resolving of some requires that use aliases defined in Webpack. ![]() Simple javascript unit tests are working properlyīut the test configuration is not working properly for unit tests of React components. Now, I am installing a Jest environment to write tests both for simple javascript files and also for React components. lots of Webpack plugins, as sass-extract-loader Estou tentando usar aliases de webpack para resolver importaes ao usar jest e, de maneira ideal, fazer referncia a webpack.aliases para evitar duplicao.I've a ReactJs project and these is the current setup:
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