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

Set a function's name property

A date range picker for your React app.

A promise based streaming tokenizer

Is this an arguments object? It's a harder question than you think.

Blazing fast and accurate glob matcher written in JavaScript, with no dependencies and full support for standard and extended Bash glob features, including braces, extglobs, POSIX brackets, and regular expressions.

Get the byteLength out of a DataView, robustly.

A function that returns the normally hidden `GeneratorFunction` constructor

Is this value a JS SharedArrayBuffer?

Push an array of items into an array, while being robust against prototype modification

A small, fast, and correct TOML parser/serializer

Get the byteOffset out of a DataView, robustly.

Determine XDG Base Directory paths (OS/platform portable)

Run commands concurrently

Common token types for decoding and encoding numeric and string values

Extend native Error to create custom errors

Promptbook: Create persistent AI agents that turn your company's scattered knowledge into action

An ESnext spec-compliant `Object.groupBy` shim/polyfill/replacement that works as far down as ES3.

Determine common OS/platform paths (home, temp, ...)

Firefox 17-26 iterators throw a StopIteration object to indicate "done". This normalizes it.