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Saravanan Rajaraman 7f7b1b9b46 feat: Adds React 18 and 19 migration plugin (#1339 )

- Adds React 18 and 19 migration orchestration plugins
- Introduces comprehensive upgrade toolkits for migrating legacy React 16/17 and 18 codebases to React 18.3.1 and 19, respectively. Each plugin bundles specialized agents and skills for exhaustive audit, dependency management, class/component API migration, test suite transformation, and batching regression fixes.
- The React 18 toolkit targets class-component-heavy apps, ensures safe lifecycle and context transitions, resolves dependency blockers, and fully automates test migrations including Enzyme removal. The React 19 toolkit addresses breaking changes such as removal of legacy APIs, defaultProps on function components, and forwardRef, while enforcing a gated, memory-resumable migration pipeline.
- Both plugins update documentation, plugin registries, and skill references to support reliable, repeatable enterprise-scale React migrations.

2026-04-09 15:18:52 +10:00

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React 18 Upgrade Plugin

Enterprise toolkit for migrating React 16/17 class-component codebases to React 18.3.1. Includes six specialized agents and seven skills targeting the specific challenges of upgrading legacy class-heavy applications.

Installation

copilot plugin install react18-upgrade@awesome-copilot

What's Included

Agents

react18-commander - Master orchestrator that coordinates the entire migration pipeline through audit, dependencies, class-component surgery, automatic batching fixes, and test verification phases.
react18-auditor - Deep-scan specialist that identifies every React 18 breaking change: unsafe lifecycle methods, legacy context, string refs, batching vulnerabilities, and all deprecation patterns.
react18-dep-surgeon - Dependency upgrade specialist that pins react@18.3.1 exactly, upgrades testing-library to v14+, resolves all peer conflicts, and returns GO/NO-GO confirmation.
react18-class-surgeon - Lifecycle and API migration specialist that performs semantic migrations for:
- componentWillMount → componentDidMount or constructor
- componentWillReceiveProps → getDerivedStateFromProps or componentDidUpdate
- componentWillUpdate → getSnapshotBeforeUpdate or componentDidUpdate
- Legacy Context → createContext
- String refs → React.createRef()
- findDOMNode → direct refs
- ReactDOM.render → createRoot
react18-batching-fixer - Automatic batching regression specialist that identifies and fixes the #1 silent runtime breaker in React 18: setState calls in async methods that relied on immediate intermediate re-renders.
react18-test-guardian - Test suite fixer that handles Enzyme-to-RTL rewrites, RTL v14 API updates, automatic batching test regressions, StrictMode double-invoke changes, and runs tests until zero failures.

Skills

react-audit-grep-patterns - Reference grep patterns for auditing React 18 deprecations across class components.
react18-batching-patterns - Patterns and strategies for identifying and fixing automatic batching regressions.
react18-dep-compatibility - Dependency compatibility matrix for React 18 with migration paths for testing-library, Apollo, Emotion, react-router.
react18-enzyme-to-rtl - Complete guide for rewriting Enzyme tests to React Testing Library (RTL v14+).
react18-legacy-context - Migration patterns for legacy context API → createContext.
react18-lifecycle-patterns - Detailed migration patterns for all three unsafe lifecycle methods.
react18-string-refs - Reference implementations for migrating string refs to React.createRef().

Quick Start

Ask: "Start implementing React 18 migration for my class-component codebase"

The react18-commander will guide you through:

Audit → identify all breaking changes
Deps → upgrade to react@18.3.1 + compatible libraries
Class Surgery → migrate lifecycle methods and APIs
Batching Fixes → fix automatic batching regressions
Tests → migrate test suite and run to green

Why React 18.3.1?

React 18.3.1 was released to surface explicit warnings for every API that React 19 will remove. A clean 18.3.1 run with zero warnings is the direct prerequisite for the React 19 migration.

Key Features

✅ Targets class-component-heavy codebases (NOT just functional component patterns)
✅ Automatic batching issue detection and flushSync recommendations
✅ Enzyme test detection with full RTL rewrite capability
✅ Memory-based resumable pipeline - survive interruptions
✅ Zero tolerance for incomplete migrations - run to full success
✅ StrictMode-aware test fixes
✅ Apollo Client, Emotion, react-router compatibility handling

Source

This plugin is part of Awesome Copilot.

License

MIT

3.8 KiB Raw Blame History