framer-motion

Version:

A simple and powerful JavaScript animation library

22 lines (20 loc) • 654 B

JavaScript

/**
 * A callback ref that sets our own `ref` and an external one, a callback
 * ref or ref object. A callback ref's cleanup is called instead of the ref
 * with null, so it's returned wrapped to clear our own ref too.
 */
const mergeRefs = (ref, externalRef) => (value) => {
    ref.current = value;
    const cleanup = typeof externalRef === "function"
        ? externalRef(value)
        : externalRef &&
            (externalRef.current = value);
    if (typeof cleanup === "function") {
        return () => {
            ref.current = null;
            cleanup();
        };
    }
};

export { mergeRefs };
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