gzip-with-CompressionStream.js

(async function() {
	let compressed_array_buffer = await compress("Hello");
	console.info("compressed_array_buffer", compressed_array_buffer);

	let text_decoder = new TextDecoder("utf-8", {fatal: true});
	// TypeError: Failed to execute 'decode' on 'TextDecoder': The encoded data was not valid.

	let compressed_text = text_decoder.decode(compressed_array_buffer);
	console.info("GZIP", compressed_text);

	// Save compressed_text...

	let encoded_chunks = new TextEncoder("utf-8", {fatal: true}).encode(compressed_text);
	let uncompressed = await decompress(encoded_chunks.buffer);
	console.info("uncompressed", uncompressed);
})();


function compress(string) {
  const byteArray = new TextEncoder("utf-8", {fatal: true}).encode(string);
  const cs = new CompressionStream("gzip");
  const writer = cs.writable.getWriter();
  writer.write(byteArray);
  writer.close();
  return new Response(cs.readable).arrayBuffer();
}

function decompress(byteArray) {
  const cs = new DecompressionStream(encoding);
  const writer = cs.writable.getWriter();
  writer.write(byteArray);
  writer.close();
  return new Response(cs.readable).arrayBuffer().then(function (arrayBuffer) {
    return new TextDecoder("utf-8", {fatal: true}).decode(arrayBuffer);
  });
}