Codemod Executor Skill

Name: codemod-executor
Rating: 76
Author: a5c-ai

Executes automated code transformations using AST-based tools for large-scale refactoring, framework migrations, and language version upgrades.

Purpose

Enable automated code transformations for:

•Framework migration (React, Angular, Vue)
•Language version upgrades
•API deprecation handling
•Pattern standardization
•Large-scale refactoring

Capabilities

1. AST-Based Transformations

•Parse source code to AST
•Apply transformation rules
•Generate modified source
•Preserve code style

2. Pattern Matching and Replacement

•Define source patterns
•Specify target patterns
•Handle edge cases
•Support wildcards and captures

3. Multi-File Transformations

•Apply across entire codebase
•Handle import updates
•Coordinate cross-file changes
•Manage side effects

4. Dry-Run Preview

•Preview changes before applying
•Generate diff reports
•Estimate impact scope
•Identify risky transformations

5. Rollback Support

•Create transformation checkpoints
•Enable selective rollback
•Track applied codemods
•Maintain change history

6. Custom Codemod Creation

•Define new transformation rules
•Test codemods in isolation
•Document transformation logic
•Share across teams

Tool Integrations

Tool	Language	Integration Method
jscodeshift	JavaScript/TypeScript	CLI
ts-morph	TypeScript	Library
Rector	PHP	CLI
Scalafix	Scala	CLI
OpenRewrite	Java	CLI / Maven
Bowler	Python	CLI
ast-grep	Multi-language	CLI / MCP
gofmt -r	Go	CLI

Output Schema

json

{
  "executionId": "string",
  "timestamp": "ISO8601",
  "codemod": {
    "name": "string",
    "version": "string",
    "description": "string"
  },
  "results": {
    "filesProcessed": "number",
    "filesModified": "number",
    "filesSkipped": "number",
    "transformations": "number"
  },
  "changes": [
    {
      "file": "string",
      "transformations": [
        {
          "type": "string",
          "line": "number",
          "before": "string",
          "after": "string"
        }
      ]
    }
  ],
  "errors": [],
  "warnings": []
}

Integration with Migration Processes

•code-refactoring: Large-scale refactoring
•framework-upgrade: Framework migrations
•language-version-migration: Syntax upgrades
•code-translation: Language conversion assist

Related Skills

•refactoring-assistant: Suggests transformations
•static-code-analyzer: Pre-transformation analysis

Related Agents

•code-transformation-executor: Orchestrates codemods
•framework-upgrade-specialist: Framework-specific codemods