I (very carefully) measured that '' + something is 5% faster than String(something). I still prefer latter for string coercion.

require() returns {} when requiring a cyclically dependent module. I'd rather have a warning.

let socket = require("socket.io-client")("http://www.example.com", { extraHeaders: { Cookie: "foo=bar; baz=qux" }})

There's a service for that: https://console.re/

(source: https://stackoverflow.com/a/506004)

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Yes, you may require JSON.

const data = require('./data.json');