react18-legacy-context
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:
- Create the context object (usually a new file)
- Update the provider component
- 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)
Step 1: Find the provider (childContextTypes + getChildContext)
Step 2: Find ALL consumers (contextTypes)
Step 3: Create the context file
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