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---
name: extract-function
description: Extracts a code block into a named function with proper types and tests
argument-hint: <file-path> <line-start>-<line-end>
user-invocable: true
allowed-tools: Read Edit
effort: low
---
## Extract Function
File: **$1**
Lines: **$2**
1. Read the file, locate the specified lines.
2. Analyze the block:
- What are the inputs? (variables read from outer scope)
- What are the outputs? (values written to or returned)
- What is the single responsibility of this block?
3. Propose a function name that describes what it does (verb phrase).
4. Show the extracted function with:
- Proper TypeScript/language types
- JSDoc if the file uses JSDoc
- The call site replacement
5. Ask for confirmation, then:
- Add the new function (above the calling function, or in a utils file if appropriate)
- Replace the original block with the function call
6. Note if this function would be useful elsewhere in the codebase.
