Array#isArray for older browsers

Node.js Streams, a user-land copy of the stream library from Node.js

Returns true if the value is an object and not an array or null.

Node.js Buffer API, for the browser

Express style path to RegExp utility

`Array.prototype.concat`, but made safe by ignoring Symbol.isConcatSpreadable

JSDoc parser

Pass in a string, array, Buffer, Data View, or Uint8Array, and get a Buffer back.

deterministic JSON.stringify() with custom sorting to get deterministic hashes from stringified results

transform the ast on a recursive walk

Convert efficiently index to/from line-column in a string