# Developer guide

- [Rules](/docs/developer-guide/rules.md) - working on stylelint's rules.
- [Plugins](/docs/developer-guide/plugins.md) - writing your own plugins.
- [Formatters](/docs/developer-guide/formatters.md) - writing your own formatters.
- [Rule testers](/docs/developer-guide/rule-testers.md) - using and writing rule testers.
- [Benchmarks](/docs/developer-guide/benchmarks.md) - running benchmarks on rules.