react18-batching-patterns
React 18 Automatic Batching Patterns
Reference for diagnosing and fixing the most dangerous silent breaking change in React 18 for class-component codebases.
The Core Change
| Location of setState | React 17 | React 18 |
|---|---|---|
| React event handler | Batched | Batched (same) |
| setTimeout | Immediate re-render | Batched |
| Promise .then() / .catch() | Immediate re-render | Batched |
| async/await | Immediate re-render | Batched |
| Native addEventListener callback | Immediate re-render | Batched |
Batched means: all setState calls within that execution context flush together in a single re-render at the end. No intermediate renders occur.
Quick Diagnosis
Read every async class method. Ask: does any code after an await read this.state to make a decision?
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