RESOLVE ALIASES JEST TEST WEBPACK INSTALL

Install npm install -save-dev jest-webpack-aliasįile _tests_/preprocessor. An example setup can be seen at the Next.js repo. $1: map it to this value in the directory I specify.Preprocessor for Jest that is able to resolve require() statements using webpack aliases.Ĭonsider using babel-plugin-module-resolver for new projects instead of jest-webpack-alias. Relative paths for imports in small projects are fine but as your Webpack allows you to use aliases by using its resolve.alias property. Testing with Jest and Webpack aliases I am looking to be able to use webpack aliases to resolve imports when using jest, and optimally, reference the webpack.aliases to avoid duplication.(.*)$: capture whatever comes after the exact match (the directory).'^_test-utils_/(.)$': '/js/app/_test-utils_/$1' Preprocessor for Jest that is able to resolve require() statements using webpack aliases - jest-webpack-alias/package. After a brief search, I found a recommendation. Specifically, Jest, the test runner, could not resolve the imports which relied on the alias. But while using this alias I found I had broken some tests. '^components/(.*)$': '/js/app/components/$1', Recent work had me creating a webpack alias which would vary by build. Install npm install -save-dev jest-webpack-alias Setup File tests/preprocessor. An example setup can be seen at the Next.js repo. 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. Consider using babel-plugin-module-resolver for new projects instead of jest-webpack-alias.

'_test-utils_': path.resolve(_dirname, 'js/app/_test-utils_') jest-webpack-alias Preprocessor for Jest that is able to resolve require () statements using webpack aliases. In this way we can minimize the usage of relative paths, e.g. Assume your webpack aliases lies in webpack.yml in resolvedpaths. 'reducers': path.resolve(_dirname, 'js/app/reducers'), How can we solve this We can create aliases at root folder level. Solved-Testing with Jest and Webpack aliases-Reactjs. Here’s our work in action (from user. This will help us to create a single source of truth regarding our aliases. 'hooks': path.resolve(_dirname, 'js/app/hooks'), Again, we have a solution We need an extra package: npm i tsconfig-paths-webpack-plugin -D. That doesn't really solve the issue of multiple directories it. The best way to mimic the behavior of the resolve.root config in webpack is to set the environment variable NODEPATH to the same directory when running jest: NODEPATHsrc jest. In Next.js project it is easy, use next-transpile-modules. The only think that remains to solve is to make consumer package to transpile the required package (since default configs of babel & webpack is to ignore nodemodule transpilation). 'types': path.resolve(_dirname, 'js/types'), After a good nights rest I looked at this again and realized it wasn't a Jest configuration but node. This will enable yarn workspace with lerna. 'modules': path.resolve(_dirname, 'js/app/modules'), 'components': path.resolve(_dirname, 'js/app/components'), I was able to properly match anycodings_webpack my webpack/typescript aliases in the anycodings_webpack with this pattern:

I have tried using jest-webpack-alias, anycodings_jestjs babel-plugin-module-resolver and the anycodings_jestjs Jest/Webpack docs 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. Imports: import Ordinal from Avatar from some reason the causes issues, so when anycodings_jestjs removed (in both alias and import), it can anycodings_jestjs find shared but components still cannot be anycodings_jestjs resolved. After doing that your tests should now run as Jest will have the same mapping to the aliased component as Webpack.

Webpack aliases: exports.aliases = path.resolve(paths.APP_DIR, path.resolve(paths.APP_DIR, 'shared/components'), 'moduleNameMapper': '/shared/components/' I am looking to be able to use webpack anycodings_jestjs aliases to resolve imports when using jest, anycodings_jestjs and optimally, reference the webpack.aliases anycodings_jestjs to avoid duplication.

Resolve aliases jest test webpack