Function prefixesOf

packages/vue/src/atomQuery.ts:40–41

(key: ReadonlyArray<unknown>)

import { atomsToRefetch, observeQueryAtom } from "./queryLifetime.ts"

/** All non-empty prefixes of a key, longest last. `[a,b,c]` -> `[[a],[a,b],[a,b,c]]`. */
const prefixesOf = (key: ReadonlyArray<unknown>): ReadonlyArray<ReadonlyArray<unknown>> =>
  key.map((_, i) => key.slice(0, i + 1))

const uniqueKeys = (keys: ReadonlyArray<ReadonlyArray<unknown>>): ReadonlyArray<ReadonlyArray<unknown>> => {