denoland-deno/tests/node_compat/test/parallel/test-stream2-read-sync-stack.js

// deno-fmt-ignore-file
// deno-lint-ignore-file

// Copyright Joyent and Node contributors. All rights reserved. MIT license.
// Taken from Node 20.11.1
// This file is automatically generated by `tests/node_compat/runner/setup.ts`. Do not modify this file manually.

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//
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'use strict';
const common = require('../common');
const Readable = require('stream').Readable;

// This tests synchronous read callbacks and verifies that even if they nest
// heavily the process handles it without an error

const r = new Readable();
const N = 256 * 1024;

let reads = 0;
r._read = function(n) {
  const chunk = reads++ === N ? null : Buffer.allocUnsafe(1);
  r.push(chunk);
};

r.on('readable', function onReadable() {
  if (!(r.readableLength % 256))
    console.error('readable', r.readableLength);
  r.read(N * 2);
});

r.on('end', common.mustCall());

r.read(0);