Pattern: Data Fetching

Pattern: Data Fetching & Async Flows

Model async data fetching, retry, cancellation, and cache states.

Data fetching is a perfect fit for state machines: idle → loading → success / error, with retry, refresh, and cancellation as transitions.

States: idle → loading → success / error / empty

Guard: canRefresh, canRetry

Context for response data and error info

Cancellation via abort signal

Data Fetching → Forms — Form submissions as async flows

Data Fetching → Navigation — Route-based data loading

Tooling: Testing — Testing async machines

Add retry with exponential backoff machine

Add caching machine

Add polling machine

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