one/dist/esm/__tests__/polyfills-mobile.test.mjs

One is a new React Framework that makes Vite serve both native and web.

import { describe, expect, it } from "vitest";
describe("mobile polyfills", () => {
  it("installs working web streams globals when the runtime has none", async () => {
    const originals = ["ReadableStream", "WritableStream", "TransformStream"].map(name => [name, Object.getOwnPropertyDescriptor(globalThis, name)]);
    for (const [name] of originals) {
      Reflect.deleteProperty(globalThis, name);
    }
    try {
      await import("../polyfills-mobile.mjs");
      const stream = new globalThis.ReadableStream({
        start(controller) {
          controller.enqueue(new TextEncoder().encode("hello"));
          controller.close();
        }
      });
      const reader = stream.getReader();
      const {
        value,
        done
      } = await reader.read();
      expect(done).toBe(false);
      expect(new TextDecoder().decode(value)).toBe("hello");
      expect(typeof globalThis.WritableStream).toBe("function");
      expect(typeof globalThis.TransformStream).toBe("function");
    } finally {
      for (const [name, descriptor] of originals) {
        Reflect.deleteProperty(globalThis, name);
        if (descriptor) {
          Object.defineProperty(globalThis, name, descriptor);
        }
      }
    }
  });
});
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