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denoland-deno/tests/node_compat/test/parallel/test-stream-readable-no-unneeded-readable.js

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// deno-fmt-ignore-file
// deno-lint-ignore-file
// Copyright Joyent and Node contributors. All rights reserved. MIT license.
// Taken from Node 18.12.1
// This file is automatically generated by `tests/node_compat/runner/setup.ts`. Do not modify this file manually.
'use strict';
const common = require('../common');
const { Readable, PassThrough } = require('stream');
function test(r) {
const wrapper = new Readable({
read: () => {
let data = r.read();
if (data) {
wrapper.push(data);
return;
}
r.once('readable', function() {
data = r.read();
if (data) {
wrapper.push(data);
}
// else: the end event should fire
});
},
});
r.once('end', function() {
wrapper.push(null);
});
wrapper.resume();
wrapper.once('end', common.mustCall());
}
{
const source = new Readable({
read: () => {}
});
source.push('foo');
source.push('bar');
source.push(null);
const pt = source.pipe(new PassThrough());
test(pt);
}
{
// This is the underlying cause of the above test case.
const pushChunks = ['foo', 'bar'];
const r = new Readable({
read: () => {
const chunk = pushChunks.shift();
if (chunk) {
// synchronous call
r.push(chunk);
} else {
// asynchronous call
process.nextTick(() => r.push(null));
}
},
});
test(r);
}