Migration Guide

CodingAdvanced

For major version upgrades (e.g., React 18 to 19, Next.js 14 to 15) or framework transitions, analyzes changes and guides you through a step-by-step migration plan with code modifications.

Trigger/migrate

FrequencyQuarterly

Developer maintaining a legacy project? Run /migrate react 19 to auto-detect breaking changes during upgrade

CTO? Quickly assess the impact scope of a tech stack transition

MigrationUpgradeCompatibilityLegacy

How It Works

Run /migrate [from -> to]

↓

Phase 1: 3 analyses in parallel

breaking-scan

Search breaking changes

dep-check

Check dependency compatibility

code-impact

Analyze code impact scope

↓

Create step-by-step migration plan

↓

✓ Migration plan + auto code modifications

Skill Code

# Migration Guide Skill
## Trigger: /migrate [framework/library] [from version] [to version]

When invoked:

1. Identify breaking changes:
 - Read official migration guide / changelog
 - Scan codebase for affected patterns
 - List deprecated APIs in use

2. Analyze impact:
 - Files affected (count + list)
 - Dependencies that need updating
 - Test coverage of affected areas

3. Generate step-by-step plan:
---
## 🔄 Migration: [lib] v[X] → v[Y]

### Impact Summary
- Files affected: [N]
- Breaking changes: [N]
- Estimated effort: [hours/days]

### Pre-migration Checklist
- [ ] Ensure all tests pass on current version
- [ ] Create migration branch
- [ ] Backup database (if applicable)

### Step-by-Step Plan
1. **Update dependencies**
 `npm install [package]@[version]`

2. **Fix breaking change: [name]**
 - Before: `[old code]`
 - After: `[new code]`
 - Files: [list]

3. [Continue for each breaking change]

### Post-migration
- [ ] Run full test suite
- [ ] Verify build passes
- [ ] Test critical user flows
---

Copy and paste into your CLAUDE.md to start using immediately.

How Migration Guide Works

Migration Guide analyzes your current framework/library version, compares it with the target version's breaking changes and deprecations, then generates a step-by-step upgrade plan with code transformation examples.

When to Use Migration Guide

Essential during major version upgrades (React 18→19, Next.js 14→15) where hundreds of breaking changes exist and manual migration would take days — it prioritizes changes by risk and provides safe migration order.

Key Strengths

Maps breaking changes to your actual codebase usage
Generates migration steps in safe dependency order
Includes code transformation examples for each change
Reduces multi-day migrations to hours with systematic approach

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