Jest Path Mapping

How to configure jest so it able to transform the mapping from tsconfig

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To enable absolute path import in our test files, we need to configure it first. ts-jest provides a helper to transform the mapping from tsconfig.

js
// jest.config.js
const { pathsToModuleNameMapper } = require('ts-jest');
const { compilerOptions } = require('./tsconfig');

/** @type {import('ts-jest').JestConfigWithTsJest} */
module.exports = {
  // [...]
  modulePaths: [compilerOptions.baseUrl],
  moduleNameMapper: pathsToModuleNameMapper(compilerOptions.paths, {
    prefix: '<rootDir>/src', // this might depend on your tsconfig configuration
  }),
};

References / Further Guide: https://kulshekhar.github.io/ts-jest/docs/getting-started/paths-mapping