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How to create and type JavaScript variables. Almost. Version: 28.0 Paths mapping If you use "baseUrl" and "paths" options in your tsconfig file, you should make sure the "moduleNameMapper" option in your Jest config is setup accordingly. sh. Using with webpack · Jest The tsconfig.json is generally put in the root folder of the project. Configuring Jest · Jest This seems obvious in retrospect. Docs on every TSConfig option - TypeScript Paths mapping | ts-jest - GitHub Pages How TypeScript infers types based on runtime behavior. Solved ts jest Issue with rewire "Cannot find module" From allowJs to useDefineForClassFields the TSConfig reference includes information about all of the active compiler flags setting up a TypeScript project. If it cannot find one, it will use the default TypeScript compiler options; except, ES2015 is used as target instead of ES5. Source: I'm struggling to get absolute path to work in a Vite react-ts project. How to fix the 'Cannot find module' error for paths that are in ... I'm trying to set up a TypeScript project with the vue-class-component decorator support. Absolute path not working in Vite project React TS Here's some example output for this file: ts // @filename: index.ts. You very likely want "CommonJS" for node projects. Configuring aliases in webpack + VS Code + Typescript + Jest setupJest.ts. Solved ts jest moduleNameMapper doesn't work for me ts-jest provides a helper to transform the mapping from tsconfig to Jest config format, but it you use it you need the .js version of the config file. ESLint. *)$": "<rootDir>/src/$1" } Please note that this configuration (which is a simple regex) should match the tsconfig path configuration. Here's some example output for this file: ts // @filename: index.ts. How to use with Jest? · Issue #97 · dividab/tsconfig-paths - GitHub If you'd like to use your package.json to store Jest's config, the "jest" key should be used on the top level so Jest will know how to find your settings: