Simple file streamer for Deno.

stream-file.ts

function streamFile(path: string) {
  let file: Deno.File,
    iter: AsyncIterableIterator<Uint8Array>;

  return new ReadableStream({
    async start() {
      file = await Deno.open(path);
      iter = Deno.iter(file);
    },

    async pull(controller) {
      const { value: chunk, done } = await iter.next();
      if (done) controller.close();
      else controller.enqueue(chunk);
    },
  });
}