/**
 * Custom Jest environment that extends jest-environment-jsdom and polyfills
 * the Fetch API (fetch, Request, Response, Headers) from Node 18+'s native
 * implementation.  This lets tests spy on `global.fetch` with jest.spyOn.
 */
const JSDOMEnvironment = require('jest-environment-jsdom').default;

class CustomJSDOMEnvironment extends JSDOMEnvironment {
  async setup() {
    await super.setup();

    // Node 18+ exposes fetch on globalThis; copy it into the jsdom sandbox.
    if (typeof globalThis.fetch === 'function') {
      this.global.fetch = globalThis.fetch.bind(globalThis);
      this.global.Request = globalThis.Request;
      this.global.Response = globalThis.Response;
      this.global.Headers = globalThis.Headers;
    }
  }
}

module.exports = CustomJSDOMEnvironment;