AgentSkillsCN

dead-code

查找并删除当前分支中未使用的代码。当被要求查找死代码、删除未使用的函数、清理未引用的代码或检查孤立控制器/服务/SDK函数时使用。触发短语包括“查找死代码”、“删除未使用代码”、“检查孤立函数”或“清理未引用导出”。

SKILL.md
--- frontmatter
name: dead-code
description: Find and remove unused code added in the current branch. Use when asked to find dead code, remove unused functions, clean up unreferenced code, or check for orphaned controllers/services/SDK functions. Triggers on phrases like "find dead code", "remove unused code", "check for orphaned functions", or "clean up unreferenced exports".

Dead Code Removal

Find and remove code added in the current branch that is never actually used.

Workflow

  1. •Get the diff: git diff master...HEAD --name-only to find changed files
  2. •For each changed file, identify newly added exports:
    • •Functions, classes, constants, types
    • •Controllers, services, SDK functions, API endpoints
    • •React components, hooks, utilities
  3. •Search the codebase for references to each new export
  4. •Flag exports with zero references (excluding their own definition and re-exports)
  5. •Remove confirmed dead code or report findings

What to Look For

Backend dead code

  • •Controllers with no routes pointing to them
  • •Service methods never called by controllers or other services
  • •SDK/API client functions never imported in frontend
  • •Middleware not registered in any route
  • •Database models with no queries

Frontend dead code

  • •Components never rendered or imported
  • •Hooks never called
  • •Utility functions never imported
  • •Context providers never used
  • •Redux actions/selectors with no dispatch/useSelector calls

Shared dead code

  • •Types/interfaces never referenced
  • •Constants never imported
  • •Exported functions only used internally (should not be exported)

Search Strategy

For each new export ExportName:

  1. •Grep for import statements: import.*ExportName or require.*ExportName
  2. •Grep for direct usage: ExportName( or <ExportName or .ExportName
  3. •Check barrel files (index.ts) for re-exports
  4. •Exclude the file where it's defined from results

An export is dead if:

  • •Zero imports outside its own file
  • •Zero usages outside its own file
  • •Not re-exported from a public API barrel

Guidelines

  • •Only analyze code added in the current branch (not pre-existing code)
  • •Be careful with dynamically referenced code (string-based imports, reflection)
  • •Check for indirect usage through barrel files and re-exports
  • •When uncertain, report as "potentially unused" rather than auto-deleting
  • •Preserve code that's part of a public API even if unused internally
  • •Report a summary: number of dead exports found, files affected, bytes removed