Question

83

How to check whether a script is running under Node.js?

rated 0 times [ 86] [ 3] / answers: 1 / hits: 112226 / 14 Years ago, fri, november 19, 2010, 12:00:00

I have a script I am requiring from a Node.js script, which I want to keep JavaScript engine independent.

For example, I want to do exports.x = y; only if it’s running under Node.js. How can I perform this test?

When posting this question, I didn’t know the Node.js modules feature is based on CommonJS.

For the specific example I gave, a more accurate question would’ve been:

How can a script tell whether it has been required as a CommonJS module?

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brynnleslis

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3 Years ago

answered 14 Years ago collinisaaka · Accepted Answer

By looking for CommonJS support, this is how the Underscore.js library does it:

Edit: to your updated question:

(function () {



    // Establish the root object, `window` in the browser, or `global` on the server.

    var root = this; 



    // Create a reference to this

    var _ = new Object();



    var isNode = false;



    // Export the Underscore object for **CommonJS**, with backwards-compatibility

    // for the old `require()` API. If we're not in CommonJS, add `_` to the

    // global object.

    if (typeof module !== 'undefined' && module.exports) {

            module.exports = _;

            root._ = _;

            isNode = true;

    } else {

            root._ = _;

    }

})();

Example here retains the Module pattern.