AsyncStateViewSources

The most recent successful result.

The most recent error.

Whether the state is empty. Defaults to a shape-derived computed that treats null/undefined and empty arrays as empty - correct for every data-carrying producer. Aggregates whose emptiness cannot be read off the data shape (an N-element array is never length 0) pass their own signal.

Whether the first successful load has not yet completed. Defaults to computed(() => false) when omitted - appropriate for mutation producers that never show a skeleton. Query producers should pass computed(() => !hadSuccess()).

Timestamp of the last successful load.

Progress 0–100, or undefined for indeterminate.

Single source of truth - the current status.