{"ast":null,"code":"import { useMemo } from 'react';\nconst toFnRef = ref => !ref || typeof ref === 'function' ? ref : value => {\n ref.current = value;\n};\nexport function mergeRefs(refA, refB) {\n const a = toFnRef(refA);\n const b = toFnRef(refB);\n return value => {\n if (a) a(value);\n if (b) b(value);\n };\n}\n\n/**\n * Create and returns a single callback ref composed from two other Refs.\n *\n * ```tsx\n * const Button = React.forwardRef((props, ref) => {\n * const [element, attachRef] = useCallbackRef();\n * const mergedRef = useMergedRefs(ref, attachRef);\n *\n * return