essencium-frontend-migration

A Claude Code plugin that automates migrating downstream projects built on essencium-frontend. It analyzes upstream changes between versions, detects customizations in your downstream project, and applies version-by-version migrations interactively -- so you stay up to date without losing your local modifications.

Installation

# Add the plugin source
claude plugin marketplace add Frachtwerk/essencium-frontend-migration-plugin

# Install the plugin
claude plugin install essencium-frontend-migration@essencium-frontend-migration

Updating

claude plugin marketplace update essencium-frontend-migration
claude plugin update essencium-frontend-migration@essencium-frontend-migration

Restart Claude Code after updating to apply changes.

Usage

In your downstream project directory, invoke the migration skill:

/migrate-essencium-frontend

Optionally specify a target version:

/migrate-essencium-frontend 9.5.0

The plugin detects your current essencium version, calculates the migration path, and walks you through each version step interactively.

What it automates

The plugin handles seven categories of upstream changes:

1. Dependency ecosystem migrations -- library upgrades (e.g., Zod v3 to v4) that affect your entire project, not just essencium-origin files
2. Infrastructure/config changes -- build tools, framework upgrades, PostCSS/ESLint/TypeScript config
3. File tracking -- modifications to files you copied from the essencium app boilerplate, merged with your customizations
4. New files -- files added upstream that your project may need
5. File removals -- files deleted upstream (e.g., CSS modules after Tailwind migration)
6. Translation key changes -- added, changed, or removed i18n keys in locale JSON files
7. Environment variable changes -- new or changed .env variables

For each category the plugin compares the upstream diff against your local files, detects customizations, and applies changes interactively -- preserving your modifications.

Links

• Upstream framework: https://github.com/Frachtwerk/essencium-frontend
• Plugin repository: https://github.com/Frachtwerk/essencium-frontend-migration-plugin

License

MIT