jest.config.js

const { pathsToModuleNameMapper } = require('ts-jest');
const { compilerOptions } = require('get-tsconfig').getTsconfig('./tsconfig.json')['config'];

module.exports = {
  /* Basic settings */
  // Enable verbosity
  verbose: true,
  // The root directory that Jest should scan for tests and modules within
  rootDir: './',
  // A list of paths to directories that Jest should use to search for files in
  roots: ['<rootDir>'],
  testEnvironment: 'node',
  testEnvironmentOptions: {
    NODE_ENV: 'test'
  },
  testMatch: ['<rootDir>/test/**/?(*.)+(unit|int|e2e|spec|test).(ts|js)'],
  preset: 'ts-jest',
  transform: {
    '^.+.tsx?$': [
      'ts-jest',
      {
        tsconfig: '<rootDir>/tsconfig.json'
      }
    ]
  },
  // Resolve 'paths' from tsconfig.json
  moduleNameMapper: pathsToModuleNameMapper(compilerOptions.paths, { prefix: '<rootDir>' }),
  // Ignore paths and modules
  modulePathIgnorePatterns: ['<rootDir>/dist'],

  /* Bootstrap settings */
  // Set initial config and enable jest-extended features
  setupFilesAfterEnv: ['<rootDir>/test/jest.setup.ts', 'jest-extended/all'],

  /* Global test settings */
  // Automatically clear mock calls and instances between every test
  clearMocks: true,

  /* Coverage settings */
  collectCoverage: false,
  // The directory where Jest should output its coverage files
  coverageDirectory: 'coverage',
  // An array of glob patterns indicating a set of files for which coverage information should be collected
  collectCoverageFrom: ['<rootDir>/src/**/*.ts'],
  coveragePathIgnorePatterns: [
    '<rootDir>/node_modules',
    '<rootDir>/src/types',
    '<rootDir>/src/index.ts',
    '<rootDir>/src/healthcheck.ts'
  ],
  // Jest custom reporters
  reporters: ['default']
  /*
   * Uncomment if you want to set thresholds for code coverage
  coverageThreshold: {
    global: {
      branches: 100,
      functions: 100,
      lines: 100,
      statements: 100
    }
  }
  */
};