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 er2-map. Try it out:
require("aphrodite/package.json"); // aphrodite is a peer dependency.
require("babel-core/package.json"); // babel-core is a peer dependency.
require("redux/package.json"); // redux is a peer dependency.
require("webpack/package.json"); // webpack is a peer dependency.
var er2Map = require("er2-map")
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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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