Function uniqueKeys

packages/vue/src/atomQuery.ts:43–53

(keys: ReadonlyArray<ReadonlyArray<unknown>>)

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>> => {
  const out: Array<ReadonlyArray<unknown>> = []
  const seen = new Set<number>()
  for (const key of keys) {
    const hash = Hash.hash(key)
    if (seen.has(hash)) continue
    seen.add(hash)
    out.push(key)
  }
  return out
}

// --- awaitable invalidation -------------------------------------------------------------------