Artificial intelligence company Anthropic PBC today announced it had made its first acquisition in acquiring developer tools startup Bun for an undisclosed price.

Founded in 2019, Bun offers an all-in-one JavaScript/TypeScript toolkit that aims to simplify and accelerate full-stack development. The company’s offering is similar in purpose to Node.js but also includes tools developers usually pull in separately, including a package manager, a bundler, a test runner and script runner, all shipped as a single executable.

Bun is built using the Zig programming language and leverages Apple’s JavaScriptCore under the hood to yield much faster startup times and lower memory usage compared with runtimes based on the V8 engine, the engine used by Node.js and others. Bun is often significantly faster in key developer workflows, such as package installation, build/bundling, test execution and runtime, making it appealing to Anthropic.