Rule Catalog

Get confused what ast-grep is? This is a list of rewriting rule to inspire you!

Explore the power of ast-grep with these rewriting rules that can transform your code in seconds!

Feel free to join our Discord channel and ask @ast-grep-bot to explain the rules for you line by line!

• C
  • Match Function Call
  • Rewrite Method to Function Call
  • Rewrite Check to Yoda Condition
• Go
  • Match Function Call
  • Find function declarations with names of certain pattern
• Python
  • Migrate OpenAi SDK
  • Use Walrus Operator in if statement
  • Prefer Generator Expressions
  • Remove async function
  • Rewrite Optional[Type] to Type | None
• Ruby
  • Prefer Symbol over Proc
  • Migrate action_filter in Ruby on Rails
  • Refactor pytest fixtures
• Rust
  • Avoid Duplicated Exports
  • Get number of digits in a usize
  • Beware of char offset when iterate over a string
• TypeScript
  • Repository of ESLint rules 🔗
  • Unnecessary useState Type
  • No await in Promise.all
  • No console except in catch block
  • Find Import File without Extension
  • Migrate XState to V5 from V4
• TSX
  • Avoid && short circuit in JSX
  • Rewrite MobX Component Style
  • Unnecessary React Hook
• Java
  • No Unused Vars