Create your next immutable state by mutating the current one

One short retrieval question about the thing you just built, inside Claude Code, GitHub Copilot, Cursor, Codex or any MCP client. Loop included.

Solves PCB copper pour regions from Circuit JSON or from a small geometry input format, returning `pcb_copper_pour`-ready B-Rep shapes.

Rules for consistent, readable, and valid package.json files. 🗂️

One Time Password (HOTP/TOTP) library for Node.js, Deno, Bun and browsers

Portable, evidence-backed development harness for coding agents.

Run async tasks one by one.

Promise based HTTP client for the browser and node.js

fast, tiny `queueMicrotask` shim for modern engines

fast and safe way to escape and unescape &<>'" chars

A cache object that deletes the least-recently-used items.

Undo Redo Manager

Google One Tap authentication strategy for Passport.

A memoization algorithm that only caches the result of the latest set of arguments, where argument equality is determined via a provided equality function.

A function to parse floating point hexadecimal strings as defined by the WebAssembly specification

Run the supplied function exactly one time (once)

A Map-like data structure that only stores the most recently set key/value pair

A well-tested CSS minifier

One-time password input component for React.

Sitemap-generating lib/cli