packages/lit-dev-content/site/docs/v3/tools/overview.md
Lit components are written using plain JavaScript or TypeScript and run out-of-the box on modern browsers with minimal tooling, so you don't need any Lit-specific compilers, tools, or workflows.
However, Lit uses very modern web platform features, so it does require some tooling and polyfills to run on older browsers. Some tools also require configuration options to handle modern JavaScript. And, while Lit is "just JavaScript" there are some tools that make working with web components much nicer.
The tools and workflows docs cover the different phases of development: