I didn't know about Deno and streams, but this looks fine

  const file = await Deno.open("huge-quotes.txt");
  const quotes: string[] = [];

  await file.readable
    .pipeThrough(new TextDecoderStream())
    .pipeThrough(new TextLineStream())
    .pipeTo(new WritableStream({
      write(line) {
        quotes.push(line);
      }
    }));