svas — Svelte Async Stores

Stores that fetch lazily, cache, revalidate, and persist. Every store emits one of three types:

type Maybe<T, E extends Error = Error> = null | T | E
//   null  → no data yet (loading / cleared / not fetched)
//   T     → resolved value
//   E     → fetch error (errors are values, never thrown)

import {
  value, values, collection,           // stores
  ok, ensure, having, awaited, once,   // guards & awaiting
  combined, sync, Async,               // compose & render
  type Maybe
} from 'svas'