jest.config.js

/**
 * @license
 * SPDX-License-Identifier: MIT
 *
 * Copyright (c) 2025-2026 Ryan Johnson
 *
 * Jest configuration optimized for memory usage and performance.
 */

module.exports = {
  // Test configuration.
  clearMocks: true,
  moduleFileExtensions: ['js', 'ts'],
  testEnvironment: 'node',
  testMatch: ['**/*.test.ts'],
  testPathIgnorePatterns: ['/node_modules/', '/dist/'],

  // Optimize for memory usage
  maxWorkers: 1, // Run tests sequentially to reduce memory pressure.
  forceExit: true, // Force exit the Jest process once all tests complete.
  detectOpenHandles: true, // Detect open handles to prevent memory leaks.
  testTimeout: 30000, // Longer timeout for network operations.

  // Transform with ts-jest.
  transform: {
    '^.+\\.ts$': [
      'ts-jest',
      {
        tsconfig: 'tsconfig.test.json', // Use test-specific tsconfig.
        diagnostics: {
          warnOnly: true, // Only warn on TS errors to reduce memory impact.
          ignoreCodes: [
            2571, // Object is of type 'unknown'.
            6133, // Unused variable.
            18003 // No inputs were found in config file.
          ]
        }
      }
    ]
  },

  // Reporting and coverage - disable by default for better performance.
  // Enable explicitly with --coverage flag only when needed.
  verbose: true,
  coverageDirectory: './coverage/',
  collectCoverage: process.env.COLLECT_COVERAGE === 'true',
  collectCoverageFrom: ['src/**/*.ts', '!src/types.ts', '!src/constants.ts'],

  // Setup for Node.js compatibility with @actions packages.
  setupFilesAfterEnv: ['<rootDir>/jest.setup.js']
};