Jest + TypeScript

jest.config.js

module.exports = {
  moduleNameMapper: {
    '^components(.*)$': '<rootDir>/src/components/$1',
    '^data(.*)$': '<rootDir>/src/data/$1',
    '^hooks(.*)$': '<rootDir>/src/hooks/$1',
    '^lib(.*)$': '<rootDir>/src/lib/$1',
    '^pages(.*)$': '<rootDir>/src/pages/$1',
    '^types(.*)$': '<rootDir>/src/types/$1',
    '^utils(.*)$': '<rootDir>/src/utils/$1',
  },
  preset: 'ts-jest',
  setupFilesAfterEnv: ['jest-dom/extend-expect', '@testing-library/react/cleanup-after-each'],
  testPathIgnorePatterns: ['/node_modules/', '/dist/'],
};

tsconfig.json

{
  "compilerOptions": {
    "allowSyntheticDefaultImports": true,
    "allowUnreachableCode": false,
    "baseUrl": "src",
    "declaration": false,
    "esModuleInterop": true,
    "experimentalDecorators": true,
    "forceConsistentCasingInFileNames": true,
    "jsx": "react",
    "lib": ["dom", "es2017"],
    "module": "esnext",
    "moduleResolution": "node",
    "noImplicitAny": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "outDir": "dist",
    "strict": true,
    "strictNullChecks": true,
    "target": "esnext",
    "types": ["node", "jest", "react"],
    "paths": {
      "*": ["node_modules/*", "*"]
    }
  },
  "include": ["src"],
  "exclude": ["node_modules"]
}

🤔

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

module.exports = {
  roots: ['<rootDir>/lib/', '<rootDir>/test/'],
  transform: {
    '^.+\\.tsx?$': 'ts-jest'
  },
  testRegex: '(/__tests__/.*|\\.(test|spec))\\.[tj]sx?$',
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
  modulePaths: [
    "<rootDir>/node_modules",
    "<rootDir>/lib/",
  ],
  preset: 'ts-jest',
  moduleNameMapper: pathsToModuleNameMapper(compilerOptions.paths)
}

You shouldn’t need transform, testRegex, or moduleFileExtensions with the ts-jest setup. At least not with Jest 24 (it now supports TS 🎉).

What does console.log(pathsToModuleNameMapper(compilerOptions.paths)) return? Something similar to the above?