bun.sh/test/bun.js/react-dom.test.tsx

import {
  concatArrayBuffers,
  readableStreamToArray,
  readableStreamToArrayBuffer,
  readableStreamToBlob,
  readableStreamToText,
  serve,
} from "bun";
import { heapStats } from "bun:jsc";
import { describe, expect, it } from "bun:test";
import { renderToReadableStream as renderToReadableStreamBrowser } from "react-dom/server.browser";
import { gc } from "./gc";
import { renderToReadableStream as renderToReadableStreamBun } from "./react-dom-server.bun.cjs";
import React from "react";

Object.defineProperty(renderToReadableStreamBrowser, "name", {
  value: "server.browser",
});
Object.defineProperty(renderToReadableStreamBun, "name", {
  value: "server.bun",
});
var port = 8908;

const fixtures = [
  // Needs at least six variations
  // - < 8 chars, latin1
  // - 8+ chars, latin1
  // - 16+ chars, latin1
  // - < 8 chars, utf16
  // - 8+ chars, utf16
  // - 16+ chars, utf16
  ["<a>b</a>", <a>b</a>],
  ["<span>Hello World!</span>", <span>Hello World!</span>],
  ["<a></a>", <a />],
  ["<span>😋</span>", <span>😋</span>],
  ["<a>😋</a>", <a>😋</a>],
  ["<span>Hello World! 😋</span>", <span>Hello World! 😋</span>],
  [
    "<span>Hello World!</span>😋",
    <>
      <span>Hello World!</span>😋
    </>,
  ],
  [
    "<span>😋Hello World!</span>",
    <>
      <span>😋Hello World!</span>
    </>,
  ],
  ["😋", <>😋</>],
  ["l😋l", <>l😋l</>],
  ["lo😋", <>lo😋</>],
  ["😋lo", <>😋lo</>],
  [
    "😋<span>Hello World!</span>",
    <>
      😋
      <span>Hello World!</span>
    </>,
  ],
  [
    "😋😋😋😋<span>Hello World!</span>",
    <>
      😋😋😋😋
      <span>Hello World!</span>
    </>,
  ],
  ["<span>Hello😋😋😋😋World!</span>", <span>Hello😋😋😋😋World!</span>],
  [
    "<span>Hello World!</span>😋😋😋😋",
    <>
      <span>Hello World!</span>
      😋😋😋😋
    </>,
  ],
  [
    "😋L😋l😋L😋<span>Alternating latin1 &amp; utf16</span>",
    <>
      😋L😋l😋L😋<span>Alternating latin1 &amp; utf16</span>
    </>,
  ],
  ["<span>Hello😋L😋l😋L😋World!</span>", <span>Hello😋L😋l😋L😋World!</span>],
  [
    "<span>Hello World!</span>😋L😋l😋L😋",
    <>
      <span>Hello World!</span>
      😋L😋l😋L😋
    </>,
  ],
];

describe("React", () => {
  it("React.createContext works", () => {
    expect(typeof React.createContext).toBe("function");
    const pleaseDontThrow = React.createContext({ foo: true });
    expect((pleaseDontThrow as any).$$typeof.description).toBe("react.context");

    const pleaseDontThrow2 = (React as any).default.createContext({
      foo: true,
    });
    expect(pleaseDontThrow2.$$typeof.description).toBe("react.context");
  });
});

describe("ReactDOM", () => {
  for (let renderToReadableStream of [
    renderToReadableStreamBun,
    renderToReadableStreamBrowser,
  ]) {
    for (let [inputString, reactElement] of fixtures) {
      describe(`${renderToReadableStream.name}(${inputString})`, () => {
        it("Response.text()", async () => {
          const stream = await renderToReadableStream(reactElement);
          gc();
          const response = new Response(stream);
          gc();
          try {
            const text = await response.text();
            gc();
            expect(text.replaceAll("<!-- -->", "")).toBe(inputString);
            gc();
          } catch (e: any) {
            console.log(e.stack);
            throw e;
          }
        });
        it("Response.arrayBuffer()", async () => {
          const stream = await renderToReadableStream(reactElement);
          gc();
          const response = new Response(stream);
          gc();
          const text = new TextDecoder().decode(await response.arrayBuffer());
          gc();
          expect(text.replaceAll("<!-- -->", "")).toBe(inputString);
          gc();
        });
        it("Response.blob()", async () => {
          const stream = await renderToReadableStream(reactElement);
          gc();
          const response = new Response(stream);
          gc();
          const text = await (await response.blob()).text();
          gc();
          expect(text.replaceAll("<!-- -->", "")).toBe(inputString);
          gc();
        });
        it("readableStreamToText(stream)", async () => {
          const stream = await renderToReadableStream(reactElement);
          gc();
          const text = await readableStreamToText(stream);
          gc();
          expect(text.replaceAll("<!-- -->", "")).toBe(inputString);
          gc();
        });
        it("readableStreamToBlob(stream)", async () => {
          try {
            const stream = await renderToReadableStream(reactElement);
            gc();
            const blob = await readableStreamToBlob(stream);
            const text = await blob.text();
            gc();
            expect(text.replaceAll("<!-- -->", "")).toBe(inputString);
            gc();
          } catch (e: any) {
            console.error(e.message);
            console.error(e.stack);
            throw e;
          }
        });
        it("readableStreamToArray(stream)", async () => {
          const stream = await renderToReadableStream(reactElement);
          gc();
          const array = await readableStreamToArray(stream);
          const text =
            renderToReadableStream === renderToReadableStreamBun
              ? array.join("")
              : new TextDecoder().decode(concatArrayBuffers(array as any[]));
          gc();
          expect(text.replaceAll("<!-- -->", "")).toBe(inputString);
          gc();
        });
        it("readableStreamToArrayBuffer(stream)", async () => {
          const stream = await renderToReadableStream(reactElement);
          gc();
          const arrayBuffer = await readableStreamToArrayBuffer(stream);
          const text = new TextDecoder().decode(arrayBuffer);
          gc();
          expect(text.replaceAll("<!-- -->", "")).toBe(inputString);
          gc();
        });
        it("for await (chunk of stream)", async () => {
          const stream = await renderToReadableStream(reactElement);
          gc();
          const chunks: any = [];
          for await (let chunk of stream) {
            chunks.push(chunk);
          }
          const text = await new Response(chunks).text();
          gc();
          expect(text.replaceAll("<!-- -->", "")).toBe(inputString);
          gc();
        });

        it("for await (chunk of stream) (arrayBuffer)", async () => {
          const stream = await renderToReadableStream(reactElement);
          gc();
          const chunks: any[] = [];
          for await (let chunk of stream) {
            chunks.push(chunk);
          }
          const text = new TextDecoder().decode(
            await new Response(chunks as any).arrayBuffer(),
          );
          gc();
          expect(text.replaceAll("<!-- -->", "")).toBe(inputString);
          gc();
        });
      });
    }
  }
  for (let renderToReadableStream of [
    renderToReadableStreamBun,
    renderToReadableStreamBrowser,
  ]) {
    // there is an event loop bug that causes deadlocks
    // the bug is with `fetch`, not with the HTTP server
    for (let [inputString, reactElement] of fixtures) {
      describe(`${renderToReadableStream.name}(${inputString})`, () => {
        it("http server, 1 request", async () => {
          await (async function () {
            var server;
            try {
              server = serve({
                port: port++,
                async fetch(req) {
                  return new Response(
                    await renderToReadableStream(reactElement),
                  );
                },
              });
              const resp = await fetch("http://localhost:" + server.port + "/");
              expect((await resp.text()).replaceAll("<!-- -->", "")).toBe(
                inputString,
              );
              gc();
            } catch (e) {
              throw e;
            } finally {
              server?.stop();
              gc();
            }
          })();
          gc();
          expect(
            heapStats().objectTypeCounts.ReadableHTTPResponseSinkController ??
              0,
          ).toBe(1);
        });
        const count = 4;
        it(`http server, ${count} requests`, async () => {
          var remain = count;
          await (async function () {
            var server;
            try {
              server = serve({
                port: port++,
                async fetch(req) {
                  return new Response(
                    await renderToReadableStream(reactElement),
                  );
                },
              });
              gc();
              while (remain--) {
                var attempt = remain + 1;
                const response = await fetch(
                  "http://localhost:" + server.port + "/",
                );
                gc();
                const result = await response.text();
                try {
                  expect(result.replaceAll("<!-- -->", "")).toBe(inputString);
                } catch (e: any) {
                  e.message += "\nAttempt: " + attempt;
                  throw e;
                }

                gc();
              }
            } catch (e) {
              throw e;
            } finally {
              server.stop();
            }
          })();

          const { ReadableHTTPResponseSinkController = 0 } =
            heapStats().objectTypeCounts;
          expect(ReadableHTTPResponseSinkController).toBe(1);
          expect(remain + 1).toBe(0);
        });
      });
    }
  }
});