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15303641
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0
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2013-03-08T21:29:37.683
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2013-03-08T21:58:23.963
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2013-03-08T21:58:23.963
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1637178
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1637178
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15302618
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2
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<code>module.paths</code> stores array of search paths for <code>require</code>. Search paths are relative to the current module from where <code>require</code> is called. So: <pre><code>var fs = require("fs"); // checks if module is available to load var isModuleAvailableSync = function(moduleName) { var ret = false; // return value, boolean var dirSeparator = require("path").sep // scan each module.paths. If there exists // node_modules/moduleName then // return true. Otherwise return false. module.paths.forEach(function(nodeModulesPath) { if(fs.existsSync(nodeModulesPath + dirSeparator + moduleName) === true) { ret = true; return false; // break forEach } }); return ret; } </code></pre> And asynchronous version: <pre><code>// asynchronous version, calls callback(true) on success // or callback(false) on failure. var isModuleAvailable = function(moduleName, callback) { var counter = 0; var dirSeparator = require("path").sep module.paths.forEach(function(nodeModulesPath) { var path = nodeModulesPath + dirSeparator + moduleName; fs.exists(path, function(exists) { if(exists) { callback(true); } else { counter++; if(counter === module.paths.length) { callback(false); } } }); }); }; </code></pre> Usage: <pre><code>if( isModuleAvailableSync("mocha") === true ) { console.log("yay!"); } </code></pre> Or: <pre><code>isModuleAvailable("colors", function(exists) { if(exists) { console.log("yay!"); } else { console.log("nay:("); } }); </code></pre> Edit: Note: <ul> <li><code>module.paths</code> is not in the <a href="http://nodejs.org/api/modules.html" rel="nofollow">API</a></li> <li>Documentation <a href="http://nodejs.org/api/modules.html#modules_loading_from_the_global_folders" rel="nofollow">states</a> that you can add paths that will be scanned by <code>require</code> but I couldn't make it work (I'm on Windows XP).</li> </ul>
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1. PONode.js - check if module is installed without actually requiring it
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1. USJan Święcki
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