Provides exact migration patterns for React string refs (ref="name" + this.refs.name) to React.createRef() in class components. Use this skill whenever migrating string ref usage - including single element refs, multiple refs in a component, refs in lists, callback refs, and refs passed to child components. Always use this skill before writing any ref migration code - the multiple-refs-in-list pattern is particularly tricky and this skill prevents the most common mistakes. Use it for React 18.3.1 migration (string refs warn) and React 19 migration (string refs removed).
String refs (ref="myInput" + this.refs.myInput) were deprecated in React 16.3, warn in React 18.3.1, and are removed in React 19.
| Pattern | Reference |
|---|---|
| Single ref on a DOM element | → patterns.md#single-ref |
| Multiple refs in one component | → patterns.md#multiple-refs |
| Refs in a list / dynamic refs | → patterns.md#list-refs |
| Callback refs (alternative approach) | → patterns.md#callback-refs |
| Ref passed to a child component | → patterns.md#forwarded-refs |
# Find all string ref assignments in JSX
grep -rn 'ref="' src/ --include="*.js" --include="*.jsx" | grep -v "\.test\."
# Find all this.refs accessors
grep -rn "this\.refs\." src/ --include="*.js" --include="*.jsx" | grep -v "\.test\."
Both should be migrated together - find the ref="name" and the this.refs.name accesses for each component as a pair.
Every string ref migrates to React.createRef():
refName = React.createRef(); as a class field (or in constructor)ref="refName" → ref={this.refName} in JSXthis.refs.refName → this.refName.current everywhereRead references/patterns.md for the full before/after for each case.