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TypeScript compiler uses tsconfig.json to get configuration options for generating JavaScript code from TypeScript source-code. The error you get "Cannot find module" is thrown by TypeScript compiler (internal ts-jest) which indicates that TypeScript cannot find that module because that module doesn't exist with that import path. Using Webpack aliases with Typescript and Jest | code & such Note: <rootDir> is a special token that gets replaced by Jest with the root of your project. You'll need to map the configuration to the Jest config format, which uses regular expressions. Now, you can use the new path aliases for module imports in your application. As mentioned in the comments by Emily Zhai, this can sometimes just require a language server restart. tsconfig paths not working - NewbeDEV ts cannot find module '@. jsconfig.json Reference - Visual Studio Code package.json. Note: jsconfig.json can be used when you don't use TypeScript Note: you need to restart dev server to reflect modifications done in tsconfig.json / jsconfig.json. Imagine code snippet: import {generate} from './license' and tsconfig.json The tsconfig option allows you to define which tsconfig JSON file to use. typescript - tsconfig paths not working - Stack Overflow First of all, we have to declare the path aliases in our tsconfig file. This results in Cannot find module error since the target *.js file does not exist. TypeScript configuration and TS2307: Cannot find module error How to create and type JavaScript variables. Absolute Imports; Next.js automatically supports the tsconfig.json and jsconfig.json "paths" and "baseUrl" options since Next.js 9.4.. Configuring Jest. This is expected. The tsconfig option allows you to define which tsconfig JSON file to use. An inline compiler options object can also be specified instead of a file path.. By default ts-jest will try to find a tsconfig.json in your project. By default ts-jest will try to find a tsconfig.json in your project. Jest's configuration can be defined in the package.json file of your project, or through a jest.config.js, or jest.config.ts file or through the --config option. So dependency updates break our es5-builds more often. Does not resolve path from tsconfig.js 'paths' option. - GitHub