RunKit + 
Try any Node.js package right in your browser
This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including detective-postcss. Try it out:
'use strict';
const detective = require('detective-postcss');
const css = `
.my_class {
background: url('myFile.png');
}`;
// or to also detect any url() references to images, fonts, etc.
const allDependencies = detective(css, { url: true });
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require()any package directly from npm- use arrow functions, classes, template strings, and most of ES6
awaitany promise instead of using callbacks (example)- create your own embedded node.js snippets
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