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# JavaScript / TypeScript Error Guide
## Frequent failure classes
- `TypeError` from undefined/null access
- async error swallowing in `Promise` chains
- `this` binding mismatches
- stale closure bugs in hooks or event handlers
- ESM / CJS import mismatches
## Minimum debugging flow
1. copy the full stack trace,
2. identify whether the failure is runtime, bundler, or type-level,
3. confirm the failing object/value before changing logic,
4. reproduce with the smallest possible input.
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