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41 lines
2.1 KiB
Markdown
41 lines
2.1 KiB
Markdown
---
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name: react18-string-refs
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description: '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).'
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---
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# React 18 String Refs Migration
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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**.
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## Quick Pattern Map
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| Pattern | Reference |
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|---|---|
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| Single ref on a DOM element | [→ patterns.md#single-ref](references/patterns.md#single-ref) |
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| Multiple refs in one component | [→ patterns.md#multiple-refs](references/patterns.md#multiple-refs) |
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| Refs in a list / dynamic refs | [→ patterns.md#list-refs](references/patterns.md#list-refs) |
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| Callback refs (alternative approach) | [→ patterns.md#callback-refs](references/patterns.md#callback-refs) |
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| Ref passed to a child component | [→ patterns.md#forwarded-refs](references/patterns.md#forwarded-refs) |
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## Scan Command
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```bash
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# Find all string ref assignments in JSX
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grep -rn 'ref="' src/ --include="*.js" --include="*.jsx" | grep -v "\.test\."
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# Find all this.refs accessors
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grep -rn "this\.refs\." src/ --include="*.js" --include="*.jsx" | grep -v "\.test\."
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```
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Both should be migrated together - find the `ref="name"` and the `this.refs.name` accesses for each component as a pair.
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## The Migration Rule
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Every string ref migrates to `React.createRef()`:
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1. Add `refName = React.createRef();` as a class field (or in constructor)
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2. Replace `ref="refName"` → `ref={this.refName}` in JSX
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3. Replace `this.refs.refName` → `this.refName.current` everywhere
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Read `references/patterns.md` for the full before/after for each case.
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