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 setup-referee-sinon. Try it out:
require("referee/package.json"); // referee is a peer dependency.
require("referee-sinon/package.json"); // referee-sinon is a peer dependency.
require("sinon/package.json"); // sinon is a peer dependency.
require("sinon-as-promised/package.json"); // sinon-as-promised is a peer dependency.
var setupRefereeSinon = require("setup-referee-sinon")
- 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
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