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react18-legacy-context

Provides the complete migration pattern for React legacy context API (contextTypes, childContextTypes, getChildContext) to the modern createContext API. Use this skill whenever migrating legacy context in class components - this is always a cross-file migration requiring the provider AND all consumers to be updated together. Use it before touching any contextTypes or childContextTypes code, because migrating only the provider without the consumers (or vice versa) will cause a runtime failure. Always read this skill before writing any context migration - the cross-file coordination steps here prevent the most common context migration bugs.

skills/react18-legacy-context/SKILL.md

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Nov 6, 2026
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# React 18 Legacy Context Migration

Legacy context (`contextTypes`, `childContextTypes`, `getChildContext`) was deprecated in React 16.3 and warns in React 18.3.1. It is **removed in React 19**.

## This Is Always a Cross-File Migration

Unlike most other migrations that touch one file at a time, context migration requires coordinating:
1. Create the context object (usually a new file)
2. Update the **provider** component
3. Update **every consumer** component

Missing any consumer leaves the app broken - it will read from the wrong context or get `undefined`.

## Migration Steps (Always Follow This Order)