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---
name: async
description: Async programming patterns for JavaScript/TypeScript, Python, and other languages.
---
## async
Write correct async code.
### JS/TS patterns
- async/await over raw .then()
- Promise.all for parallel tasks
- Promise.allSettled for all results
- AbortController for cancellation
- Avoid promise nesting
### Common issues
- Unhandled rejections
- Race conditions
- Deadlocks
- Fire-and-forget without error handling
- Sequential when parallel is possible
