Source: https://seerepo.com/r/tailwindlabs/tailwindcss/built
Markdown source: https://seerepo.com/r/tailwindlabs/tailwindcss/built.md
Description: tailwindcss is a TypeScript repo built with H3 and Vite. It is tested with libfuzzer-sys, @playwright/test, and Vitest.

# What is tailwindcss built with?

tailwindcss is a TypeScript repo built with H3 and Vite. It is tested with libfuzzer-sys, @playwright/test, and Vitest and deploys with log, tracing, and tracing-subscriber. It has 165,694 written lines, with 137 test files.

Read on November 4, 2026, at commit 2626ae6.

Repository: https://github.com/tailwindlabs/tailwindcss

## Support (/)

### Testing

- **libfuzzer-sys**

### Deploy

- **[log](https://seerepo.com/uses/log)**: 4 files
- **[tracing](https://seerepo.com/uses/tracing)**: 4 files
- **[tracing-subscriber](https://seerepo.com/uses/tracing-subscriber)**: 1 file

### Tools

- **proc-macro2**
- **quote**: 1 file
- **syn**: 1 file

### Other

- **bstr**: 8 files
- **dunce**: 6 files
- **rustc-hash**: 4 files
- **walkdir**: 3 files
- **globset**: 2 files
- **regex**: 2 files
- **regex-automata**: 2 files
- **winapi-util**: 2 files
- **memchr**: 1 file
- **rayon**: 1 file
- **same-file**: 1 file

## Support (crates/node)

### Tools

- **napi-derive**: 1 file

### Other

- **napi**
- **rayon**

## Support (packages/@tailwindcss-browser)

### The base

- **H3**: 1 file

### Testing

- **@playwright/test**: 1 file

## Support (packages/@tailwindcss-cli)

### Testing

- **Vitest**: 4 files

### Other

- **picocolors**: 2 files

## Frontend (packages/@tailwindcss-node)

### Styles

- **lightningcss**: 1 file

## Support (packages/@tailwindcss-node)

### Testing

- **Vitest**: 3 files

### Tools

- **jiti**: 1 file
- **magic-string**: 1 file
- **source-map-js**: 1 file

## Frontend (packages/@tailwindcss-postcss)

### Styles

- **PostCSS**: 3 files
- **postcss-import**: 2 files

## Support (packages/@tailwindcss-postcss)

### Testing

- **Vitest**: 3 files

### Other

- **dedent**: 2 files

## Frontend (packages/@tailwindcss-standalone)

### Styles

- **tailwindcss**: 1 file

## Support (packages/@tailwindcss-turbopack)

### Tools

- **Webpack**: 1 file

## Frontend (packages/@tailwindcss-upgrade)

### Styles

- **PostCSS**: 18 files
- **postcss-selector-parser**: 1 file

## Support (packages/@tailwindcss-upgrade)

### Testing

- **Vitest**: 28 files

### Tools

- **globby**: 2 files
- **Prettier**: 1 file
- **tree-sitter**: 1 file
- **tree-sitter-typescript**: 1 file

### Other

- **picocolors**: 3 files
- **dedent**: 1 file
- **SemVer**: 1 file

## Frontend (packages/@tailwindcss-vite)

### The base

- **[Vite](https://seerepo.com/uses/vite)**: 1 file

## Support (packages/@tailwindcss-webpack)

### Tools

- **Webpack**: 1 file

## Support (packages/tailwindcss)

### Testing

- **Vitest**: 58 files
- **@playwright/test**: 1 file

### Tools

- **magic-string**: 1 file
- **source-map-js**: 1 file

### Other

- **dedent**: 5 files

## Other repos with a similar stack

- [CapSoftware/Cap](https://seerepo.com/r/CapSoftware/Cap/built): Vite, log, tracing, tracing-subscriber · [Compare](https://seerepo.com/compare/CapSoftware/Cap/vs/tailwindlabs/tailwindcss)
- [NousResearch/hermes-agent](https://seerepo.com/r/NousResearch/hermes-agent/built): Vite, tracing, tracing-subscriber · [Compare](https://seerepo.com/compare/NousResearch/hermes-agent/vs/tailwindlabs/tailwindcss)
- [clash-verge-rev/clash-verge-rev](https://seerepo.com/r/clash-verge-rev/clash-verge-rev/built): Vite, log, tracing · [Compare](https://seerepo.com/compare/clash-verge-rev/clash-verge-rev/vs/tailwindlabs/tailwindcss)
- [vercel/next.js](https://seerepo.com/r/vercel/next.js/built): tracing, tracing-subscriber, PostCSS · [Compare](https://seerepo.com/compare/tailwindlabs/tailwindcss/vs/vercel/next.js)
- [openai/codex](https://seerepo.com/r/openai/codex/built): log, tracing, tracing-subscriber · [Compare](https://seerepo.com/compare/openai/codex/vs/tailwindlabs/tailwindcss)
- [denoland/deno](https://seerepo.com/r/denoland/deno/built): log, tracing, tracing-subscriber · [Compare](https://seerepo.com/compare/denoland/deno/vs/tailwindlabs/tailwindcss)

## Frequently asked questions

### What language is tailwindcss written in?

tailwindcss is written in TypeScript, with 165,694 written lines.

### What framework does tailwindcss use?

tailwindcss is built with H3 and Vite.

### Does tailwindcss have tests?

Yes. tailwindcss has 137 test files and is tested with libfuzzer-sys, @playwright/test, and Vitest.

### Which repos have a stack like tailwindcss's?

The ones that share most of its stack: CapSoftware/Cap, NousResearch/hermes-agent, and clash-verge-rev/clash-verge-rev.

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.