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A lexicon-driven AppView for ATProto.
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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263import * as React from "react";
type PossibleRef<T> = React.Ref<T> | undefined;
/** * Set a given ref to a given value * This utility takes care of different types of refs: callback refs and RefObject(s) */function setRef<T>(ref: PossibleRef<T>, value: T) { if (typeof ref === "function") { return ref(value); }
if (ref !== null && ref !== undefined) { ref.current = value; }}
/** * A utility to compose multiple refs together * Accepts callback refs and RefObject(s) */function composeRefs<T>(...refs: PossibleRef<T>[]): React.RefCallback<T> { return (node) => { let hasCleanup = false; const cleanups = refs.map((ref) => { const cleanup = setRef(ref, node); if (!hasCleanup && typeof cleanup === "function") { hasCleanup = true; } return cleanup; });
// React <19 will log an error to the console if a callback ref returns a // value. We don't use ref cleanups internally so this will only happen if a // user's ref callback returns a value, which we only expect if they are // using the cleanup functionality added in React 19. if (hasCleanup) { return () => { for (let i = 0; i < cleanups.length; i++) { const cleanup = cleanups[i]; if (typeof cleanup === "function") { cleanup(); } else { setRef(refs[i], null); } } }; } };}
/** * A custom hook that composes multiple refs * Accepts callback refs and RefObject(s) */function useComposedRefs<T>(...refs: PossibleRef<T>[]): React.RefCallback<T> { // biome-ignore lint/correctness/useExhaustiveDependencies: we want to memoize by all values return React.useCallback(composeRefs(...refs), refs);}
export { composeRefs, useComposedRefs };