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 @pumpn/cssnano-preset-default. Try it out:
require("postcss/package.json"); // postcss is a peer dependency.
var cssnanoPresetDefault = require("@pumpn/cssnano-preset-default")
- all documents on RunKit are public
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
This service is provided by RunKit and is not affiliated with npm, Inc or the package authors.