jest.config.js

module.exports = {
  preset: 'ts-jest',
  testEnvironment: 'node',
  roots: ['<rootDir>/src'],
  testMatch: ['**/__tests__/**/*.ts', '**/?(*.)+(spec|test).ts'],
  transform: {
    '^.+\\.ts$': ['ts-jest', {
      isolatedModules: true
    }],
  },
  moduleFileExtensions: ['ts', 'js', 'json', 'node'],
  collectCoverage: true,
  coverageDirectory: 'coverage',
  collectCoverageFrom: [
    'src/**/*.ts',
    '!src/**/*.d.ts',
    '!src/**/__tests__/**',
  ],
  setupFilesAfterEnv: ['<rootDir>/src/__tests__/setup.ts'],
};