exenv

React's ExecutionEnvironment module extracted.

Many modules and components out there in the wild, uses React's private ExecutionEnvironment lib for feature detection, like:

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canUseDOM = require('react/lib/ExecutionEnvironment').canUseDOM; // BAD

Which is not a good practice as private libs are prone to modification or deletion, so Jed Watson has created exenv for us.

P.S: isInWorker has been left out as it's very specific to react.

Install it: npm install --save exenv

Sample usage:

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var exenv = require('exenv');
console.log(exenv);
//Object {canUseDOM: true, canUseWorkers: true, canUseEventListeners: true, canUseViewport: true}

GIF FTW!