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codemod-generator

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Generate automated code migration scripts (codemods)

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How to use this skill

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Source SKILL.md: https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/sdk-platform-development/skills/codemod-generator/SKILL.md

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Codemod Generator Skill

Overview

This skill generates automated code migration scripts (codemods) that transform consumer code to use new API versions, reducing the burden of SDK upgrades on developers.

Capabilities

  • Create AST-based code transformations
  • Support multiple languages (JavaScript, TypeScript, Python, Go)
  • Provide dry-run mode with change preview
  • Implement safe rollback mechanisms
  • Generate detailed migration reports
  • Handle edge cases and partial migrations
  • Support interactive migration modes
  • Validate transformations with tests

Target Processes

  • Backward Compatibility Management
  • Package Distribution
  • SDK Versioning and Release Management

Integration Points

  • jscodeshift for JavaScript/TypeScript
  • libcst for Python
  • go-codemod for Go
  • Rector for PHP
  • Custom AST transformers

Input Requirements

  • Source and target API versions
  • Transformation rules specification
  • Test cases for validation
  • Edge case handling requirements
  • Rollback strategy

Output Artifacts

  • Codemod scripts per language
  • Dry-run reports
  • Migration validation tests
  • Edge case documentation
  • CLI wrapper for execution
  • Rollback scripts

Usage Example

skill:
  name: codemod-generator
  context:
    sourceVersion: "1.x"
    targetVersion: "2.0"
    languages:
      - typescript
      - python
    transformations:
      - type: methodRename
        from: oldMethod
        to: newMethod
      - type: parameterChange
        method: createResource
        changes:
          - name: config
            wrap: options
    dryRun: true
    generateTests: true

Best Practices

  1. Always provide dry-run mode first
  2. Generate comprehensive change reports
  3. Handle partial migrations gracefully
  4. Include rollback capabilities
  5. Test codemods against real codebases
  6. Document manual intervention cases