#typescript

Zustand is a minimal, hook-based state management library for React (with a framework-agnostic vanilla core) built on simplified flux principles. It avoids context providers and boilerplate while handling React's tricky edge cases like zombie children and concurrency.

Vue.js core is a progressive JavaScript/TypeScript framework for building user interfaces, centered on a reactive data system and declarative component-based rendering. This repository (Vue 3) houses the reactivity engine, compiler, runtime, and Single-File Component support.

Expo is a framework and platform for building universal native apps with React and React Native, providing a managed SDK, build/deployment services (EAS), and a large set of cross-platform native APIs and tooling.

TanStack Query is an async state management library for fetching, caching, synchronizing, and updating server state in web apps. It abstracts the lifecycle of asynchronous data with declarative queries and mutations, supporting any data source (REST, GraphQL, promises) across React, Vue, Svelte, Solid, and Angular.

React Hook Form is a performant, dependency-free form library for React that uses uncontrolled inputs and hooks (register, handleSubmit, formState) to minimize re-renders, with built-in HTML validation and schema resolvers for Zod, Yup, Joi, and others.

Payload is an open-source, TypeScript-native headless CMS and application framework that installs directly into a Next.js `/app` folder. It generates a customizable React admin UI, auto-types your data, and lets you query the database directly from React Server Components alongside REST and GraphQL APIs.

Vuetify is a comprehensive Vue component library implementing Material Design, offering a large catalog of ready-made, accessible UI components and a theming/layout system for building Vue 3 applications.

esbuild is a high-performance JavaScript/TypeScript/CSS bundler and minifier written in Go, designed to be 10-100x faster than traditional web build tools. It offers a unified CLI, JS, and Go API with built-in support for ESM/CommonJS, JSX, tree shaking, source maps, and plugins.

Tiptap is a headless, framework-agnostic rich text editor built on top of ProseMirror. It ships no UI of its own, instead exposing a composable extension system that lets developers build fully custom editing experiences in React, Vue, or vanilla JavaScript.

xyflow is a monorepo of open-source libraries (React Flow and Svelte Flow) for building interactive node-based UIs such as flowcharts, diagrams, and workflow editors. It provides draggable nodes, connectable edges, and built-in components like minimaps, controls, and backgrounds, all heavily customizable.

Fastify is a high-performance Node.js web framework built around a powerful plugin/encapsulation architecture and JSON Schema-based validation and serialization. It aims to minimize per-request overhead while keeping a clean, developer-friendly API for building HTTP APIs and services.

Refine is a React-based meta-framework for building data-intensive applications like internal tools, admin panels, dashboards, and CRMs. It provides headless hooks and adapters for data fetching, auth, routing, and access control while leaving the UI layer open to your choice of component library.

Medusa is an open-source, headless commerce platform built in TypeScript that provides modular building blocks—orders, carts, products, pricing, fulfillment—plus a customization framework so developers can build bespoke commerce backends without rewriting core commerce logic.

Slate is a completely customizable framework for building rich text editors in React. Rather than shipping a fixed editor, it provides a schema-less, plugin-driven core and a nested document model so developers can implement editors like Medium, Dropbox Paper, or Google Docs without fighting against built-in assumptions.

Composio is an integration platform that gives AI agents and LLMs authenticated access to hundreds of external tools and apps (Gmail, Slack, GitHub, etc.) through a managed SDK, handling OAuth, auth config, and tool execution so agents can take real-world actions.

MobX is a signal-based reactive state management library that makes any object observable and automatically tracks which derived computations and UI components depend on which fields, re-running only what's strictly needed. It's framework-agnostic at its core but most commonly paired with React via mobx-react/mobx-react-lite.

TanStack Table is a headless, framework-agnostic datagrid library that supplies table logic—sorting, filtering, grouping, aggregation, pagination, and row selection—while leaving all markup and styling to the developer. It ships adapters for React, Vue, Solid, Svelte, Angular, and Lit.

react-admin is a React/TypeScript framework for building data-driven admin panels and B2B single-page apps on top of any REST or GraphQL API. It ships ready-made hooks and Material UI components for CRUD pages, forms, datagrids, auth, i18n, and more, all wired through a pluggable "Data Provider" adapter layer.

Onlook is an open-source visual editor for React apps that pairs an AI agent with a design-tool-style canvas, letting you edit a live Next.js/TailwindCSS app visually and in code while the changes write back to the actual source. It positions itself as a "Cursor for designers," bridging the gap between design and front-end development.

NativeScript is an open-source framework for building truly native iOS, Android, and visionOS apps from JavaScript or TypeScript, exposing platform APIs directly to JS without a WebView. It integrates with Angular, React, Vue, Svelte, and Solid front-end stacks.

Vercel's AI SDK is a TypeScript toolkit that provides a unified API for calling many LLM providers (OpenAI, Anthropic, Google, etc.), with first-class support for streaming, structured output, tool calling, and agents, plus React/Svelte/Vue hooks for building chat and generative UIs.

Blueprint is Palantir's React-based UI toolkit, distributed as a set of modular NPM packages, designed for building complex, data-dense desktop web interfaces. It ships polished components including an interactive spreadsheet-like table, date/time pickers, selects, and an extensive icon set with a cohesive design system.

Jotai is a minimal, atom-based state management library for React built around tiny composable "atoms" of state that can be derived, combined, and made async. It avoids string keys, integrates with Suspense, and scales from a useState replacement to large TypeScript apps.

Radix Primitives is a low-level, unstyled React component library that provides accessible, customizable building blocks (dialogs, dropdowns, tooltips, etc.) for constructing design systems and web apps. It handles the hard parts—accessibility, keyboard interaction, focus management—while leaving styling entirely up to you.

ice.js is Alibaba's universal React-based application framework offering zero-config builds, file-system routing, built-in state management and data fetching, and hybrid SSR/SSG rendering, extensible through a plugin system and able to target web, mini-programs, and Weex.

Wasp is a Rails-like, declarative full-stack web framework that uses a high-level spec file to generate a React + TanStack Query frontend, Node.js/Express backend, and Prisma database layer — handling auth, RPC, jobs, and deployment with minimal boilerplate.

Naive UI is a Vue 3 component library written entirely in TypeScript, offering 90+ tree-shakable components with a JS-based, type-safe theming system that requires no separate CSS imports or build-loader configuration.

wangEditor is an open-source, web-based rich text (WYSIWYG) editor written in TypeScript, popular in the Chinese developer community. It ships with framework integrations and a configurable toolbar for building content-editing experiences in the browser.

Plate is a TypeScript rich-text editor framework built on Slate and slate-react, offering a plugin system plus a large catalog of plugins, Radix UI-based headless primitives, and ready-made shadcn/ui components for assembling production editors.

Umi is an extensible, convention-over-configuration React application framework from the Ant Group ecosystem, providing routing, build tooling, plugins, and conventions out of the box for enterprise-grade web apps.

Adobe's family of React libraries for building accessible UIs: React Spectrum (styled components implementing Adobe's design system), React Aria (unstyled accessible components and hooks), React Stately (cross-platform state management hooks), and framework-agnostic internationalization utilities.

VERT is a privacy-focused file conversion web app that runs conversions locally in the browser via WebAssembly, supporting 250+ formats across images, audio, documents, and video without uploading files to the cloud.

PrimeVue is a comprehensive open-source UI component library for Vue 3, offering 90+ ready-made components with theming, accessibility support, and first-class Nuxt integration.

A VSCode extension that reformats TypeScript's notoriously dense error messages into readable, syntax-highlighted output, adding inline links to type declarations and external explanation resources.

Rolldown is a Rust-based JavaScript/TypeScript bundler designed as a drop-in, Rollup-compatible replacement, built for speed and intended to become the unified bundler powering the Vite ecosystem.

Omi is a lightweight web components framework from Tencent that combines Custom Elements, JSX/function components, and signal-driven reactivity. It supports both OOP class components and data-oriented reactive functions, and produces standards-based components usable across React, Vue, and plain HTML.

PrimeNG is a comprehensive open-source UI component library for Angular, offering 80+ ready-made components such as data tables, forms, overlays, charts, and menus, along with theming support.

boardgame.io is a JavaScript/TypeScript engine for building turn-based games by writing pure functions that describe how game state changes on each move. It automatically handles multiplayer synchronization, storage, game phases, bots, and lobby/matchmaking, with view-layer-agnostic clients including React bindings.

Chat UI is Hugging Face's open-source SvelteKit web app that provides a polished chat interface for any OpenAI-compatible LLM endpoint. It powers HuggingChat and supports MongoDB-backed history, MCP tool calling, and local heuristic model routing.

CKEditor 5 is a TypeScript-built, modular WYSIWYG rich-text editor and framework with a custom document model, virtual DOM rendering, and a large plugin ecosystem covering everything from basic formatting to real-time collaborative editing, comments, and track changes.

Flowbite is an open-source UI component library built on top of Tailwind CSS, providing pre-styled interactive elements (modals, dropdowns, navbars, tooltips, etc.) that can be wired up via HTML data attributes or controlled programmatically through a JavaScript/TypeScript API.

An enterprise-focused Angular UI component library implementing the Ant Design system, providing 70+ TypeScript components with theming, i18n, SSR, and zoneless/OnPush support.

tsParticles is a dependency-free TypeScript library for rendering animated particle effects (confetti, snow, fireworks, interactive link networks, and more) on a canvas. It ships a modular engine with optional feature bundles and official wrapper components for nearly every major frontend framework.

Radix Themes is a pre-styled, themeable React component library built on top of Radix UI's accessible primitives, offering a complete design system with ready-to-use components, tokens, and styling controls for rapid app development.

Microbundle is a zero-configuration bundler for small JavaScript and TypeScript libraries, built on Rollup. It reads your package.json and emits optimized CJS, UMD, ESM, and modern ES2017 bundles with Babel transpilation, Terser minification, and TypeScript typings out of the box.

React95 is a React component library that recreates the Windows 95 user interface aesthetic with modern, themeable components built on styled-components. It provides classic widgets like menus, windows, buttons, and separators for building retro-styled web apps.

A comprehensive UI toolset and component library for React Native by Wix, offering pre-built components plus a design-system foundation layer (colors, typography, spacings) and a modifier-based styling syntax for rapidly composing theme-consistent screens.

TanStack Form is a headless, framework-agnostic form state library for managing complex forms with full TypeScript typing, reactive field hooks, and synchronous/asynchronous validation. You bring your own UI while it handles form state, validation, and workflows.

Windi CSS is a utility-first CSS framework that generates styles on demand by scanning your HTML/CSS, offering Tailwind-compatible utilities with faster build times and HMR. The project has been officially sunset and is no longer recommended for new projects.

Arco Design is a comprehensive React UI component library (60+ components) built on ByteDance's Arco Design system, with strong TypeScript support, extensive theming via design tokens, and a surrounding ecosystem for themes, materials, and icons.

Fusion Next (@alifd/next) is Alibaba's enterprise-class React UI component library built around a design-system collaboration workflow, letting designers customize component themes and ship them as npm packages that developers consume without manual UI rework.

Taiga UI is a large, fully tree-shakable Angular UI kit offering 130+ components, 100+ directives, plus utilities and tokens, with CSS-custom-property theming and dark mode out of the box. It is built on dependency injection, OnPush change detection, and strict TypeScript.

Data Client is a TypeScript data-fetching and normalized caching library for React (and Vue, React Native, Next.js, Expo) that uses declarative, schema-driven resource definitions to bind dynamic data—REST, GraphQL, WebSockets/SSE—to components with one-line hooks and zero manual cache updater functions.