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 state-handler. Try it out:
const StateHandler = require('state-handler')
const state = {
items: []
}
const sh = StateHandler(state)
const off = sh.on(
(s) => s.items.length === 2,
(s) => console.log(JSON.stringify(s.items)),
(s) => s.items = []
)
state.items.push(1)
sh.exec() // NOP
state.items.push(2)
sh.exec() // exec
off()
state.items.push(3)
state.items.push(4)
sh.exec() // NOP
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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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