runtime: implement CompressionStream/DecompressionStream (#24757)

Closes https://github.com/oven-sh/bun/issues/1723
Closes https://github.com/oven-sh/bun/pull/22214
Closes https://github.com/oven-sh/bun/pull/24241

also supports the `"brotli"` and `"zstd"` formats

<img width="1244" height="547" alt="image"
src="https://github.com/user-attachments/assets/aecf4489-29ad-411d-9f6b-3bee50ed1b27"
/>

bench/runner.mjs

@@ -13,7 +13,4 @@ export function run(opts = {}) {
 }
 
 export const bench = Mitata.bench;
-
-export function group(_name, fn) {
-  return Mitata.group(fn);
-}
+export const group = Mitata.group;

bench/snippets/compression-streams.mjs

@@ -0,0 +1,156 @@
+import { bench, group, run } from "../runner.mjs";
+
+const runAll = !process.argv.includes("--simple");
+
+const small = new Uint8Array(1024);
+const medium = new Uint8Array(1024 * 100);
+const large = new Uint8Array(1024 * 1024);
+
+for (let i = 0; i < large.length; i++) {
+  const value = Math.floor(Math.sin(i / 100) * 128 + 128);
+  if (i < small.length) small[i] = value;
+  if (i < medium.length) medium[i] = value;
+  large[i] = value;
+}
+
+const format = new Intl.NumberFormat("en-US", { notation: "compact", unit: "byte" });
+
+async function compress(data, format) {
+  const cs = new CompressionStream(format);
+  const writer = cs.writable.getWriter();
+  const reader = cs.readable.getReader();
+
+  writer.write(data);
+  writer.close();
+
+  const chunks = [];
+  while (true) {
+    const { done, value } = await reader.read();
+    if (done) break;
+    chunks.push(value);
+  }
+
+  const result = new Uint8Array(chunks.reduce((acc, chunk) => acc + chunk.length, 0));
+  let offset = 0;
+  for (const chunk of chunks) {
+    result.set(chunk, offset);
+    offset += chunk.length;
+  }
+  return result;
+}
+
+async function decompress(data, format) {
+  const ds = new DecompressionStream(format);
+  const writer = ds.writable.getWriter();
+  const reader = ds.readable.getReader();
+
+  writer.write(data);
+  writer.close();
+
+  const chunks = [];
+  while (true) {
+    const { done, value } = await reader.read();
+    if (done) break;
+    chunks.push(value);
+  }
+
+  const result = new Uint8Array(chunks.reduce((acc, chunk) => acc + chunk.length, 0));
+  let offset = 0;
+  for (const chunk of chunks) {
+    result.set(chunk, offset);
+    offset += chunk.length;
+  }
+  return result;
+}
+
+async function roundTrip(data, format) {
+  const compressed = await compress(data, format);
+  return await decompress(compressed, format);
+}
+
+const formats = ["deflate", "gzip", "deflate-raw"];
+if (runAll) formats.push("brotli", "zstd");
+
+// Small data benchmarks (1KB)
+group(`CompressionStream ${format.format(small.length)}`, () => {
+  for (const fmt of formats) {
+    try {
+      new CompressionStream(fmt);
+      bench(fmt, async () => await compress(small, fmt));
+    } catch (e) {
+      // Skip unsupported formats
+    }
+  }
+});
+
+// Medium data benchmarks (100KB)
+group(`CompressionStream ${format.format(medium.length)}`, () => {
+  for (const fmt of formats) {
+    try {
+      new CompressionStream(fmt);
+      bench(fmt, async () => await compress(medium, fmt));
+    } catch (e) {}
+  }
+});
+
+// Large data benchmarks (1MB)
+group(`CompressionStream ${format.format(large.length)}`, () => {
+  for (const fmt of formats) {
+    try {
+      new CompressionStream(fmt);
+      bench(fmt, async () => await compress(large, fmt));
+    } catch (e) {
+      // Skip unsupported formats
+    }
+  }
+});
+
+const compressedData = {};
+for (const fmt of formats) {
+  try {
+    compressedData[fmt] = {
+      small: await compress(small, fmt),
+      medium: await compress(medium, fmt),
+      large: await compress(large, fmt),
+    };
+  } catch (e) {
+    // Skip unsupported formats
+  }
+}
+
+group(`DecompressionStream ${format.format(small.length)}`, () => {
+  for (const fmt of formats) {
+    if (compressedData[fmt]) {
+      bench(fmt, async () => await decompress(compressedData[fmt].small, fmt));
+    }
+  }
+});
+
+group(`DecompressionStream ${format.format(medium.length)}`, () => {
+  for (const fmt of formats) {
+    if (compressedData[fmt]) {
+      bench(fmt, async () => await decompress(compressedData[fmt].medium, fmt));
+    }
+  }
+});
+
+group(`DecompressionStream ${format.format(large.length)}`, () => {
+  for (const fmt of formats) {
+    if (compressedData[fmt]) {
+      bench(fmt, async () => await decompress(compressedData[fmt].large, fmt));
+    }
+  }
+});
+
+group(`roundtrip ${format.format(large.length)}`, () => {
+  for (const fmt of formats) {
+    try {
+      new CompressionStream(fmt);
+      bench(fmt, async () => await roundTrip(large, fmt));
+    } catch (e) {
+      // Skip unsupported formats
+    }
+  }
+});
+
+await run();