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 @seneca/refer. Try it out:
require("@seneca/entity-util/package.json"); // @seneca/entity-util is a peer dependency.
require("seneca/package.json"); // seneca is a peer dependency.
require("seneca-entity/package.json"); // seneca-entity is a peer dependency.
require("seneca-promisify/package.json"); // seneca-promisify is a peer dependency.
var refer = require("@seneca/refer")
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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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