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 @lido-sdk/contracts. Try it out:
require("@ethersproject/abstract-signer/package.json"); // @ethersproject/abstract-signer is a peer dependency.
require("@ethersproject/contracts/package.json"); // @ethersproject/contracts is a peer dependency.
require("@ethersproject/providers/package.json"); // @ethersproject/providers is a peer dependency.
require("ethers/package.json"); // ethers is a peer dependency.
var contracts = require("@lido-sdk/contracts")
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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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