0405a18dd86f10aaa5809fa059cc1664.json

{"ast":null,"code":"import { useEffect, useRef } from 'react';\n/**\n * Runs an effect only when the dependencies have changed, skipping the\n * initial \"on mount\" run. Caution, if the dependency list never changes,\n * the effect is **never run**\n *\n * ```ts\n *  const ref = useRef<HTMLInput>(null);\n *\n *  // focuses an element only if the focus changes, and not on mount\n *  useUpdateEffect(() => {\n *    const element = ref.current?.children[focusedIdx] as HTMLElement\n *\n *    element?.focus()\n *\n *  }, [focusedIndex])\n * ```\n * @param effect An effect to run on mount\n *\n * @category effects\n */\n\nfunction useUpdateEffect(fn, deps) {\n  var isFirst = useRef(true);\n  useEffect(function () {\n    if (isFirst.current) {\n      isFirst.current = false;\n      return;\n    }\n\n    return fn();\n  }, deps);\n}\n\nexport default useUpdateEffect;","map":null,"metadata":{},"sourceType":"module"}