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 @nomiclabs/truffle-contract. Try it out:
require("web3/package.json"); // web3 is a peer dependency.
require("web3-core-helpers/package.json"); // web3-core-helpers is a peer dependency.
require("web3-core-promievent/package.json"); // web3-core-promievent is a peer dependency.
require("web3-eth-abi/package.json"); // web3-eth-abi is a peer dependency.
require("web3-utils/package.json"); // web3-utils is a peer dependency.
var truffleContract = require("@nomiclabs/truffle-contract")
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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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