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 codemirror-line-numbers-relative. Try it out:
require("@codemirror/state/package.json"); // @codemirror/state is a peer dependency.
require("@codemirror/view/package.json"); // @codemirror/view is a peer dependency.
require("@codemirror/gutter/package.json"); // @codemirror/gutter is a peer dependency.
var codemirrorLineNumbersRelative = require("codemirror-line-numbers-relative")
- 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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