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<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <title>TTY | Node.js v9.11.2 Documentation</title> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Lato:400,700,400italic"> <link rel="stylesheet" href="assets/style.css"> <link rel="stylesheet" href="assets/sh.css"> <link rel="canonical" href="https://nodejs.org/api/tty.html"> </head> <body class="alt apidoc" id="api-section-tty"> <div id="content" class="clearfix"> <div id="column2" class="interior"> <div id="intro" class="interior"> <a href="/" title="Go back to the home page"> Node.js </a> </div> <!--introduced_in=v0.10.0--> <ul> <li><a class="nav-documentation" href="documentation.html">About these Docs</a></li> <li><a class="nav-synopsis" href="synopsis.html">Usage & Example</a></li> </ul> <div class="line"></div> <ul> <li><a class="nav-assert" href="assert.html">Assertion Testing</a></li> <li><a class="nav-async_hooks" 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<li><a class="nav-https-groups-google-com-group-nodejs" href="https://groups.google.com/group/nodejs">Mailing List</a></li> </ul> </div> <div id="column1" data-id="tty" class="interior"> <header> <h1>Node.js v9.11.2 Documentation</h1> <div id="gtoc"> <ul> <li> <a href="index.html" name="toc">Index</a> </li> <li> <a href="all.html">View on single page</a> </li> <li> <a href="tty.json">View as JSON</a> </li> <li class="version-picker"> <a href="#">View another version <span>▼</span></a> <ol class="version-picker"><li><a href="https://nodejs.org/docs/latest-v9.x/api/tty.html">9.x</a></li> <li><a href="https://nodejs.org/docs/latest-v8.x/api/tty.html">8.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v7.x/api/tty.html">7.x</a></li> <li><a href="https://nodejs.org/docs/latest-v6.x/api/tty.html">6.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v5.x/api/tty.html">5.x</a></li> <li><a href="https://nodejs.org/docs/latest-v4.x/api/tty.html">4.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v0.12.x/api/tty.html">0.12.x</a></li> <li><a href="https://nodejs.org/docs/latest-v0.10.x/api/tty.html">0.10.x</a></li></ol> </li> </ul> </div> <hr> </header> <div id="toc"> <h2>Table of Contents</h2> <ul> <li><span class="stability_2"><a href="#tty_tty">TTY</a></span><ul> <li><span class="stability_undefined"><a href="#tty_class_tty_readstream">Class: tty.ReadStream</a></span><ul> <li><span class="stability_undefined"><a href="#tty_readstream_israw">readStream.isRaw</a></span></li> <li><span class="stability_undefined"><a href="#tty_readstream_istty">readStream.isTTY</a></span></li> <li><span class="stability_undefined"><a href="#tty_readstream_setrawmode_mode">readStream.setRawMode(mode)</a></span></li> </ul> </li> <li><span class="stability_undefined"><a href="#tty_class_tty_writestream">Class: tty.WriteStream</a></span><ul> <li><span class="stability_undefined"><a href="#tty_event_resize">Event: 'resize'</a></span></li> <li><span class="stability_undefined"><a href="#tty_writestream_columns">writeStream.columns</a></span></li> <li><span class="stability_undefined"><a href="#tty_writestream_istty">writeStream.isTTY</a></span></li> <li><span class="stability_undefined"><a href="#tty_writestream_rows">writeStream.rows</a></span></li> <li><span class="stability_undefined"><a href="#tty_writestream_getcolordepth_env">writeStream.getColorDepth([env])</a></span></li> </ul> </li> <li><span class="stability_undefined"><a href="#tty_tty_isatty_fd">tty.isatty(fd)</a></span></li> </ul> </li> </ul> </div> <div id="apicontent"> <h1>TTY<span><a class="mark" href="#tty_tty" id="tty_tty">#</a></span></h1> <!--introduced_in=v0.10.0--> <div class="api_stability api_stability_2"><a href="documentation.html#documentation_stability_index">Stability: 2</a> - Stable</div><p>The <code>tty</code> module provides the <code>tty.ReadStream</code> and <code>tty.WriteStream</code> classes. In most cases, it will not be necessary or possible to use this module directly. However, it can be accessed using:</p> <pre><code class="lang-js">const tty = require('tty'); </code></pre> <p>When Node.js detects that it is being run with a text terminal ("TTY") attached, <a href="process.html#process_process_stdin"><code>process.stdin</code></a> will, by default, be initialized as an instance of <code>tty.ReadStream</code> and both <a href="process.html#process_process_stdout"><code>process.stdout</code></a> and <a href="process.html#process_process_stderr"><code>process.stderr</code></a> will, by default be instances of <code>tty.WriteStream</code>. The preferred method of determining whether Node.js is being run within a TTY context is to check that the value of the <code>process.stdout.isTTY</code> property is <code>true</code>:</p> <pre><code class="lang-sh">$ node -p -e "Boolean(process.stdout.isTTY)" true $ node -p -e "Boolean(process.stdout.isTTY)" | cat false </code></pre> <p>In most cases, there should be little to no reason for an application to manually create instances of the <code>tty.ReadStream</code> and <code>tty.WriteStream</code> classes.</p> <h2>Class: tty.ReadStream<span><a class="mark" href="#tty_class_tty_readstream" id="tty_class_tty_readstream">#</a></span></h2> <div class="api_metadata"> <span>Added in: v0.5.8</span> </div><p>The <code>tty.ReadStream</code> class is a subclass of <a href="net.html#net_class_net_socket"><code>net.Socket</code></a> that represents the readable side of a TTY. In normal circumstances <a href="process.html#process_process_stdin"><code>process.stdin</code></a> will be the only <code>tty.ReadStream</code> instance in a Node.js process and there should be no reason to create additional instances.</p> <h3>readStream.isRaw<span><a class="mark" href="#tty_readstream_israw" id="tty_readstream_israw">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.7.7</span> </div><p>A <code>boolean</code> that is <code>true</code> if the TTY is currently configured to operate as a raw device. Defaults to <code>false</code>.</p> <h3>readStream.isTTY<span><a class="mark" href="#tty_readstream_istty" id="tty_readstream_istty">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.5.8</span> </div><p>A <code>boolean</code> that is always <code>true</code> for <code>tty.ReadStream</code> instances.</p> <h3>readStream.setRawMode(mode)<span><a class="mark" href="#tty_readstream_setrawmode_mode" id="tty_readstream_setrawmode_mode">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.7.7</span> </div><p>Allows configuration of <code>tty.ReadStream</code> so that it operates as a raw device.</p> <p>When in raw mode, input is always available character-by-character, not including modifiers. Additionally, all special processing of characters by the terminal is disabled, including echoing input characters. Note that <code>CTRL</code>+<code>C</code> will no longer cause a <code>SIGINT</code> when in this mode.</p> <ul> <li><code>mode</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type" class="type"><boolean></a> If <code>true</code>, configures the <code>tty.ReadStream</code> to operate as a raw device. If <code>false</code>, configures the <code>tty.ReadStream</code> to operate in its default mode. The <code>readStream.isRaw</code> property will be set to the resulting mode.</li> </ul> <h2>Class: tty.WriteStream<span><a class="mark" href="#tty_class_tty_writestream" id="tty_class_tty_writestream">#</a></span></h2> <div class="api_metadata"> <span>Added in: v0.5.8</span> </div><p>The <code>tty.WriteStream</code> class is a subclass of <code>net.Socket</code> that represents the writable side of a TTY. In normal circumstances, <a href="process.html#process_process_stdout"><code>process.stdout</code></a> and <a href="process.html#process_process_stderr"><code>process.stderr</code></a> will be the only <code>tty.WriteStream</code> instances created for a Node.js process and there should be no reason to create additional instances.</p> <h3>Event: 'resize'<span><a class="mark" href="#tty_event_resize" id="tty_event_resize">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.7.7</span> </div><p>The <code>'resize'</code> event is emitted whenever either of the <code>writeStream.columns</code> or <code>writeStream.rows</code> properties have changed. No arguments are passed to the listener callback when called.</p> <pre><code class="lang-js">process.stdout.on('resize', () => { console.log('screen size has changed!'); console.log(`${process.stdout.columns}x${process.stdout.rows}`); }); </code></pre> <h3>writeStream.columns<span><a class="mark" href="#tty_writestream_columns" id="tty_writestream_columns">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.7.7</span> </div><p>A <code>number</code> specifying the number of columns the TTY currently has. This property is updated whenever the <code>'resize'</code> event is emitted.</p> <h3>writeStream.isTTY<span><a class="mark" href="#tty_writestream_istty" id="tty_writestream_istty">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.5.8</span> </div><p>A <code>boolean</code> that is always <code>true</code>.</p> <h3>writeStream.rows<span><a class="mark" href="#tty_writestream_rows" id="tty_writestream_rows">#</a></span></h3> <div class="api_metadata"> <span>Added in: v0.7.7</span> </div><p>A <code>number</code> specifying the number of rows the TTY currently has. This property is updated whenever the <code>'resize'</code> event is emitted.</p> <h3>writeStream.getColorDepth([env])<span><a class="mark" href="#tty_writestream_getcolordepth_env" id="tty_writestream_getcolordepth_env">#</a></span></h3> <div class="api_metadata"> <span>Added in: v9.9.0</span> </div><ul> <li><code>env</code> <span class="type"><object></span> A object containing the environment variables to check. Defaults to <code>process.env</code>.</li> <li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li> </ul> <p>Returns:</p> <ul> <li>1 for 2,</li> <li>4 for 16,</li> <li>8 for 256,</li> <li>24 for 16,777,216 colors supported.</li> </ul> <p>Use this to determine what colors the terminal supports. Due to the nature of colors in terminals it is possible to either have false positives or false negatives. It depends on process information and the environment variables that may lie about what terminal is used. To enforce a specific behavior without relying on <code>process.env</code> it is possible to pass in an object with different settings.</p> <p>Use the <code>NODE_DISABLE_COLORS</code> environment variable to enforce this function to always return 1.</p> <h2>tty.isatty(fd)<span><a class="mark" href="#tty_tty_isatty_fd" id="tty_tty_isatty_fd">#</a></span></h2> <div class="api_metadata"> <span>Added in: v0.5.8</span> </div><ul> <li><code>fd</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a> A numeric file descriptor</li> </ul> <p>The <code>tty.isatty()</code> method returns <code>true</code> if the given <code>fd</code> is associated with a TTY and <code>false</code> if it is not, including whenever <code>fd</code> is not a non-negative integer.</p> </div> </div> </div> <script src="assets/sh_main.js"></script> <script src="assets/sh_javascript.min.js"></script> <script>highlight(undefined, undefined, 'pre');</script> <!-- __TRACKING__ --> </body> </html>
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