jest.setup.ts

import { TextDecoder, TextEncoder } from "util";
import { ReadableStream, TransformStream, WritableStream } from "stream/web";
import "whatwg-fetch";

// Polyfills required by MSW 2.x
global.TextEncoder = TextEncoder;
global.TextDecoder = TextDecoder as typeof global.TextDecoder;
global.ReadableStream = ReadableStream as typeof global.ReadableStream;
global.TransformStream = TransformStream as typeof global.TransformStream;
global.WritableStream = WritableStream as typeof global.WritableStream;

// BroadcastChannel polyfill for MSW
global.BroadcastChannel = class BroadcastChannel {
  name: string;
  constructor(name: string) {
    this.name = name;
  }
  postMessage() {}
  close() {}
  addEventListener() {}
  removeEventListener() {}
  dispatchEvent() {
    return true;
  }
  onmessage = null;
  onmessageerror = null;
} as unknown as typeof global.BroadcastChannel;

global.ResizeObserver = jest.fn().mockImplementation(() => ({
  observe: jest.fn(),
  unobserve: jest.fn(),
  disconnect: jest.fn()
}));