The same useRef, but with callback

## Installation

Run an array of functions in parallel

Easily read/write JSON files.

Make a callback- or promise-based function support both promises and callbacks.

Additive request-field registry for the official DeepSeek LLM API adapter

React hook which returns the latest callback without changing the reference

React components for auto-hwp: open .hwp/.hwpx, render pages to SVG, mark cells/ranges, chat-edit via a host-supplied AI callback, and download HTML/PDF — one <HwpWorkspace/> line. No LLM, no keys, no bundled fonts.

Write files in an atomic fashion w/configurable ownership

Get a random temporary file or directory path

Client core services: SlotsService, SessionsService (scope tree + object layer)

JSON Web Token implementation (symmetric and asymmetric)

Returns a promise from a node-style callback function.

An efficient queue capable of managing thousands of concurrent animations.

List files and directories inside the specified directory

Get and validate the raw body of a readable stream.

A library for efficiently walking a directory recursively

Get the status of a file with some features

Run a child as if it's the foreground process. Give it stdio. Exit when it exits.

Langfuse integration for Vercel AI SDK v7