README.md (2034B)
1 <!-- 2 3 @license Apache-2.0 4 5 Copyright (c) 2018 The Stdlib Authors. 6 7 Licensed under the Apache License, Version 2.0 (the "License"); 8 you may not use this file except in compliance with the License. 9 You may obtain a copy of the License at 10 11 http://www.apache.org/licenses/LICENSE-2.0 12 13 Unless required by applicable law or agreed to in writing, software 14 distributed under the License is distributed on an "AS IS" BASIS, 15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 See the License for the specific language governing permissions and 17 limitations under the License. 18 19 --> 20 21 # Standard Error 22 23 > [Standard error][standard-streams]. 24 25 <section class="usage"> 26 27 ## Usage 28 29 ```javascript 30 var stderr = require( '@stdlib/streams/node/stderr' ); 31 ``` 32 33 #### stderr 34 35 [Standard error][standard-streams] as a [Writable stream][writable-stream]. 36 37 ```javascript 38 // Write to the terminal... 39 stderr.write( 'Oh no!', 'utf8' ); 40 // e.g., => 'Oh no!' 41 ``` 42 43 </section> 44 45 <!-- /.usage --> 46 47 <section class="notes"> 48 49 ## Notes 50 51 - Unlike other streams, `stderr` can **never** be closed and, thus, never emits a `'finish'` event. 52 - Although rare, writes can block when output is redirected to a file. 53 54 </section> 55 56 <!-- /.notes --> 57 58 <section class="examples"> 59 60 ## Examples 61 62 <!-- run-disable --> 63 64 <!-- eslint no-undef: "error" --> 65 66 ```javascript 67 var proc = require( 'process' ); 68 var stdin = require( '@stdlib/streams/node/stdin' ); 69 var stderr = require( '@stdlib/streams/node/stderr' ); 70 71 // Set the encoding: 72 stdin.setEncoding( 'utf8' ); 73 74 // Create an echo stream: 75 stdin.pipe( stderr ); 76 77 // Push data to `stdin`: 78 stdin.push( 'beep' ); 79 stdin.push( ' ' ); 80 stdin.push( 'boop' ); 81 stdin.push( '\n' ); 82 83 // End the stream: 84 stdin.push( null ); 85 86 // Ensure the process closes: 87 setTimeout( proc.exit, 1000 ); 88 ``` 89 90 </section> 91 92 <!-- /.examples --> 93 94 <section class="links"> 95 96 [standard-streams]: https://en.wikipedia.org/wiki/Standard_streams 97 98 [writable-stream]: https://nodejs.org/api/stream.html#stream_class_stream_writable 99 100 </section> 101 102 <!-- /.links -->