Babysitter codemod-generator

Generate automated code migration scripts (codemods)

install

source · Clone the upstream repo

git clone https://github.com/a5c-ai/babysitter

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/a5c-ai/babysitter "$T" && mkdir -p ~/.claude/skills && cp -r "$T/library/specializations/sdk-platform-development/skills/codemod-generator" ~/.claude/skills/a5c-ai-babysitter-codemod-generator && rm -rf "$T"

manifest: library/specializations/sdk-platform-development/skills/codemod-generator/SKILL.md

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

Always provide dry-run mode first
Generate comprehensive change reports
Handle partial migrations gracefully
Include rollback capabilities
Test codemods against real codebases
Document manual intervention cases