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test/setup.ts

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+import { expect, type Assertion, type AsymmetricMatchersContaining } from 'vitest';
+import * as matchers from '@testing-library/jest-dom/matchers';
+import { type TestingLibraryMatchers } from '@testing-library/jest-dom/matchers';
+import '@testing-library/jest-dom';
+
+declare module 'vitest' {
+  interface Assertion<T = any> extends TestingLibraryMatchers<typeof expect.stringContaining, T> { }
+  interface AsymmetricMatchersContaining extends TestingLibraryMatchers<any, any> { }
+}
+
+expect.extend(matchers);
+
+
+// In Node 20 / Vitest environment, Response and Headers are already
+// defined globally. Polyfilling them from node-fetch is no longer
+// required and avoids deprecation warnings.
+if (typeof globalThis.Response === 'undefined') {
+  console.warn('Polyfilling Response for test environment');
+}