jest.config.js

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

// https://jestjs.io/docs/en/configuration.html
module.exports = {
  preset: 'ts-jest',
  roots: ['<rootDir>/src'],
  testEnvironment: 'node',
  testEnvironmentOptions: {
    NODE_ENV: 'test',
  },
  collectCoverageFrom: ['src/**/*.{js,jsx,ts,tsx}', '!src/**/index.ts', '!src/**/*.interface.ts', '!src/**/*.d.ts'],
  coveragePathIgnorePatterns: ['node_modules', 'src/config', 'src/app.ts', 'src/server.ts', 'tests'],
  coverageReporters: ['text', 'lcov', 'clover', 'html'],
  roots: ['<rootDir>/src'],
  transform: {
    '^.+\\.tsx?$': ['ts-jest', { tsconfig: './tsconfig.spec.json' }],
  },
  moduleNameMapper: pathsToModuleNameMapper(compilerOptions.paths, { prefix: '<rootDir>/src' }),
  setupFiles: [],
  setupFilesAfterEnv: ['<rootDir>/setupTests.ts'],
  testMatch: ['<rootDir>/src/**/__tests__/**/*.{js,jsx,ts,tsx}', '<rootDir>/src/**/*.{spec,test}.{js,jsx,ts,tsx}'],
  resetMocks: true,
};