1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
// deno-fmt-ignore-file// deno-lint-ignore-file
// Copyright Joyent and Node contributors. All rights reserved. MIT license.// Taken from Node 18.12.0// This file is automatically generated by "node/_tools/setup.ts". Do not modify this file manually
// Copyright Joyent, Inc. and other Node contributors.//// Permission is hereby granted, free of charge, to any person obtaining a// copy of this software and associated documentation files (the// "Software"), to deal in the Software without restriction, including// without limitation the rights to use, copy, modify, merge, publish,// distribute, sublicense, and/or sell copies of the Software, and to permit// persons to whom the Software is furnished to do so, subject to the// following conditions://// The above copyright notice and this permission notice shall be included// in all copies or substantial portions of the Software.//// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';require('../common');const assert = require('assert');
// This test verifies that stream.unshift(Buffer.alloc(0)) or// stream.unshift('') does not set state.reading=false.const Readable = require('stream').Readable;
const r = new Readable();let nChunks = 10;const chunk = Buffer.alloc(10, 'x');
r._read = function(n) {  setImmediate(() => {    r.push(--nChunks === 0 ? null : chunk);  });};
let readAll = false;const seen = [];r.on('readable', () => {  let chunk;  while ((chunk = r.read()) !== null) {    seen.push(chunk.toString());    // Simulate only reading a certain amount of the data,    // and then putting the rest of the chunk back into the    // stream, like a parser might do.  We just fill it with    // 'y' so that it's easy to see which bits were touched,    // and which were not.    const putBack = Buffer.alloc(readAll ? 0 : 5, 'y');    readAll = !readAll;    r.unshift(putBack);  }});
const expect =  [ 'xxxxxxxxxx',    'yyyyy',    'xxxxxxxxxx',    'yyyyy',    'xxxxxxxxxx',    'yyyyy',    'xxxxxxxxxx',    'yyyyy',    'xxxxxxxxxx',    'yyyyy',    'xxxxxxxxxx',    'yyyyy',    'xxxxxxxxxx',    'yyyyy',    'xxxxxxxxxx',    'yyyyy',    'xxxxxxxxxx',    'yyyyy' ];
r.on('end', () => {  assert.deepStrictEqual(seen, expect);  console.log('ok');});