sanity/src/core/util/useUnique.ts

Sanity is a real-time content infrastructure with a scalable, hosted backend featuring a Graph Oriented Query Language (GROQ), asset pipelines and fast edge caches

import {isEqual} from 'lodash'
import {useRef} from 'react'

/**
 * This React hook should be considered an escape hatch – to make sure that a value is the same
 * on every render. SHOULD NOT BE USED IN MOST CASES.
 * @deprecated please use `useMemo` and `useCallback` strategies instead to make deps stable, this hook runs comparisons on every single render and while each comparison can be fast, it quickly adds up
 *
 * @internal
 */
export function useUnique<ValueType>(value: ValueType): ValueType {
  const valueRef = useRef<ValueType>(value)

  if (!isEqual(valueRef.current, value)) {
    valueRef.current = value
  }

  return valueRef.current
}