browser-gzip.ts

declare const DecompressionStream: any;
declare const CompressionStream: any;

const encoder = new TextEncoder();
const decoder = new TextDecoder();
async function compress(str: string): Promise<ArrayBuffer> {
  const cs = new CompressionStream("gzip");
  const buf = encoder.encode(str);
  const stream = new Response(buf).body!.pipeThrough(cs);
  return new Response(stream as any).arrayBuffer();
}

async function decompress(buffer: ArrayBuffer): Promise<string> {
  const ds = new DecompressionStream("gzip");
  const decompressedStream = new Blob([buffer]).stream().pipeThrough(ds);
  const buf = await new Response(decompressedStream as any).arrayBuffer();
  return decoder.decode(buf);
}

async function main() {
  const json = { a: 1 };
  const str = JSON.stringify(json);
  const compressed = await compress(str);
  const restored = await decompress(compressed);
  console.assert(str === restored);
}

main();

await new Response(new Blob([new TextEncoder().encode(JSON.stringify({"hello": "world"}))]).stream().pipeThrough(new CompressionStream("gzip"))).arrayBuffer()