Bun is an all-in-one JavaScript toolchain that combines a fast runtime, a high-performance bundler, a modern transpiler, a test runner, and a package manager into a single binary. Built with Zig, it emphasizes speed, startup time, and reduced disk I/O, aiming to replace multiple separate tools with one cohesive workflow. Core features include native support for TypeScript and JSX, zero-config defaults, an efficient caching layer, and streamlined project setup and dependency management across platforms.

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Bun

Unified JS runtime with bundling, transpiling, and package manager

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