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// TDD Test: Jest should properly handle ESM modules with .js extensions // This test MUST FAIL first to prove we need the fix import { describe, it, expect, jest } from '@jest/globals'; import { fileURLToPath } from 'url'; import { dirname, join } from 'path'; import { readFileSync } from 'fs'; const __filename = fileURLToPath(import.meta.url); const __dirname = dirname(__filename); describe('Jest ESM Configuration', () => { it('should import ESM modules with .js extensions without errors', async () => { // This test verifies Jest can handle .js extensions in ESM imports // Testing basic ES6 module imports await expect(async () => { const { readFile } = await import('node:fs/promises'); return typeof readFile; }).not.toThrow(); }); it('should have proper Jest configuration for ESM', () => { // Verify Jest config exists and has correct ESM settings const jestConfigPath = join(__dirname, '..', 'jest.config.js'); const config = readFileSync(jestConfigPath, 'utf-8'); // Check for required ESM configuration expect(config).toContain('extensionsToTreatAsEsm'); expect(config).toContain('.js'); expect(config).toMatch(/transform:\s*{|"transform":\s*{/); expect(config).toContain('moduleNameMapper'); expect(config).toContain('^(\\\\.{1,2}/.*)\\\\.js$'); }); it('should handle node: protocol imports', async () => { // Test that node: protocol imports work correctly await expect(async () => { const { readFile } = await import('node:fs/promises'); return readFile; }).not.toThrow(); }); });