Best TypeScript Tools & Libraries

refly

github

The first open-source agent skills builder. Define skills by vibe workflow, run on Claude Code, Cursor, Codex & more. Build Clawdbot 🦞· APIs for Lovable · Bots for Slack & Lark/Feishu · Skills are infrastructure, not prompts.

ts-jest

github

A Jest transformer with source map support that lets you use Jest to test projects written in TypeScript.

oneuptime

github

Complete open-source monitoring and observability platform.

howtheytest

github

A collection of public resources about how software companies test their software

massCode

github

A free, open-source developer workspace. Snippets, notes, calculations, and dev tools in one local-first app

superagent

github

Superagent protects your AI applications against prompt injections, data leaks, and harmful outputs. Embed safety directly into your app and prove compliance to your customers.

codeburn

github

See where your AI coding tokens go. Interactive TUI dashboard for Claude Code, Codex, and Cursor cost observability.

yalc

github

Work with yarn/npm packages locally like a boss.

headlamp

github

A Kubernetes web UI that is fully-featured, user-friendly and extensible

cypress-realworld-app

github

A payment application to demonstrate real-world usage of Cypress testing methods, patterns, and workflows.

helicone

github

🧊 Open source LLM observability platform. One line of code to monitor, evaluate, and experiment. YC W23 🍓

shortest

github

QA via natural language AI tests

privacy.sexy

github

Open-source tool to enforce privacy & security best-practices on Windows, macOS and Linux, because privacy is sexy

react-hooks-testing-library

github

🐏 Simple and complete React hooks testing utilities that encourage good testing practices.

DeepSeek-Reasonix

github

DeepSeek-native AI coding agent for your terminal. Engineered around prefix-cache stability — leave it running.

awesome-agent-skills

github

Tutorials, Guides and Agent Skills Directories

mission-control

github

Self-hosted AI agent orchestration platform: dispatch tasks, run multi-agent workflows, monitor spend, and govern operations from one mission control dashboard.

fast-check

github

Property based testing framework for JavaScript (like QuickCheck) written in TypeScript

pomatez

github

Stay Focused. Take a Break.

byterover-cli

github

ByteRover CLI (brv) - The portable memory layer for autonomous coding agents (formerly Cipher)

paseo

github

Orchestrate coding agents remotely from your phone, desktop and CLI

ueli

github

Cross-Platform Keystroke Launcher

buttercup-desktop

github

:key: Cross-Platform Passwords & Secrets Vault

intern

github

A next-generation code testing stack for JavaScript.