String replacer can not properly handle './module' and ./module/index loading cases. It runs in the background after bundles are generated. How to mock dependency in Jest with TypeScript? Now, you can use the new path aliases for module imports in your application. So we change our ts-jest configuration in package.json (in the "jest" section add) - "moduleNameMapper": { "^src/(. Configuring Jest · Jest Note: <rootDir> is a special token that gets replaced by Jest with the root of your project. Docs on every TSConfig option - TypeScript Does not resolve path from tsconfig.js 'paths' option. - GitHub Path aliases with TypeScript in Node.js - DEV Community Everything seems to be fine, the application compiles properly and works fine as well but there's one thing that bothers me. JavaScript does not understand those module paths. jest cannot find module cannot find type definition file for 'node' tsconfig Also, tools like ts-node or ts-jest do not understand these module path imports. Using with webpack · Jest Angular >=13 | jest-preset-angular - GitHub Pages sh. By default ts-jest will try to find a tsconfig.json in your project. Which says that each module you import will be looked into node_modules first and if not found will be looked into src directory. Step 2: Configuring path resolution on tsconfig.js. it's not plain JavaScript. So dependency updates break our es5-builds more often. Please see the Modules documentation for more information. So, I followed the below instructions, first I have deleted the package-lock.json file, second I removed the node modules from my project, in the 'package.json' file then, I have . Consider an import statement like import { a } from "moduleA" ; in order to check any use of a, the compiler needs to know exactly what it represents, and will need to check its definition moduleA. ('./resolve-tsconfig-path-to-webpack-alias'); module . This is expected. There we will establish the mapping between the aliases and the physical paths. In order to inform that mapping, we need to open the wepback.config.js file and add a new section called resolve.