Codemod Executor Skill Skill

Codemod Executor Skill

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

{
  "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

Agent Skills: Codemod Executor Skill

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Skill Files