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import { concat, indexOf } from "./deps.ts";
export interface ReadlineOptions {  separator: Uint8Array;}
const defaultReadlineOptions = {  separator: new Uint8Array([10]), // newline symbol};
export async function* readline(  reader: Deno.Reader,  options: ReadlineOptions = defaultReadlineOptions,): AsyncIterableIterator<Uint8Array> {  const { separator } = options;
  let buf = new Uint8Array(0);  for await (const chunk of Deno.iter(reader)) {    buf = concat(buf, chunk);
    let index;    while ((index = indexOf(buf, separator)) >= 0) {      const line = buf.slice(0, index);      buf = buf.slice(index + separator.length);      yield line;    }  }
  yield buf;}