feat(react): add video component and utility hooks (#293)

packages/react/src/utils/tests/use-composed-refs.test.tsx

@@ -0,0 +1,127 @@
+import type { MutableRefObject, RefObject } from 'react';
+
+import { render } from '@testing-library/react';
+
+import { useRef } from 'react';
+
+import { describe, expect, it, vi } from 'vitest';
+
+import { composeRefs, useComposedRefs } from '../use-composed-refs';
+
+// Helper to create a mutable ref object for testing (without using deprecated createRef)
+function createMutableRef<T>(initialValue: T | null = null): MutableRefObject<T | null> {
+  return { current: initialValue };
+}
+
+describe('composeRefs', () => {
+  it('sets value on callback ref', () => {
+    const callbackRef = vi.fn();
+    const composed = composeRefs(callbackRef);
+
+    composed('test-value');
+
+    expect(callbackRef).toHaveBeenCalledWith('test-value');
+  });
+
+  it('sets value on RefObject', () => {
+    const refObject = createMutableRef<string>();
+    const composed = composeRefs(refObject);
+
+    composed('test-value');
+
+    expect(refObject.current).toBe('test-value');
+  });
+
+  it('sets value on multiple refs', () => {
+    const callbackRef = vi.fn();
+    const refObject = createMutableRef<string>();
+    const composed = composeRefs(callbackRef, refObject);
+
+    composed('test-value');
+
+    expect(callbackRef).toHaveBeenCalledWith('test-value');
+    expect(refObject.current).toBe('test-value');
+  });
+
+  it('handles undefined refs', () => {
+    const callbackRef = vi.fn();
+    const composed = composeRefs(undefined, callbackRef, undefined);
+
+    composed('test-value');
+
+    expect(callbackRef).toHaveBeenCalledWith('test-value');
+  });
+
+  it('returns cleanup function when callback ref returns one', () => {
+    const cleanup = vi.fn();
+    const callbackRef = vi.fn().mockReturnValue(cleanup);
+    const composed = composeRefs(callbackRef);
+
+    const returnedCleanup = composed('test-value') as (() => void) | void;
+
+    expect(returnedCleanup).toBeTypeOf('function');
+    if (typeof returnedCleanup === 'function') {
+      returnedCleanup();
+    }
+    expect(cleanup).toHaveBeenCalled();
+  });
+
+  it('clears RefObject on cleanup', () => {
+    const cleanup = vi.fn();
+    const callbackRef = vi.fn().mockReturnValue(cleanup);
+    const refObject = createMutableRef<string>();
+    const composed = composeRefs(callbackRef, refObject);
+
+    composed('test-value');
+    expect(refObject.current).toBe('test-value');
+
+    const returnedCleanup = composed('test-value') as (() => void) | void;
+    if (typeof returnedCleanup === 'function') {
+      returnedCleanup();
+    }
+
+    expect(refObject.current).toBeNull();
+  });
+});
+
+describe('useComposedRefs', () => {
+  it('returns a stable callback ref', () => {
+    let composedRef1: ((value: HTMLDivElement | null) => void) | null = null;
+    let composedRef2: ((value: HTMLDivElement | null) => void) | null = null;
+
+    function TestComponent() {
+      const ref1 = useRef<HTMLDivElement>(null);
+      const ref2 = useRef<HTMLDivElement>(null);
+      const composed = useComposedRefs(ref1, ref2);
+
+      if (!composedRef1) {
+        composedRef1 = composed;
+      } else {
+        composedRef2 = composed;
+      }
+
+      return <div ref={composed}>Test</div>;
+    }
+
+    const { rerender } = render(<TestComponent />);
+    rerender(<TestComponent />);
+
+    // Same refs should produce same composed ref
+    expect(composedRef1).toBe(composedRef2);
+  });
+
+  it('works with forwardRef pattern', () => {
+    const externalRef = createMutableRef<HTMLDivElement>();
+
+    function TestComponent({ forwardedRef }: { forwardedRef: RefObject<HTMLDivElement | null> }) {
+      const internalRef = useRef<HTMLDivElement>(null);
+      const composedRef = useComposedRefs(forwardedRef, internalRef);
+
+      return <div ref={composedRef}>Test</div>;
+    }
+
+    render(<TestComponent forwardedRef={externalRef} />);
+
+    expect(externalRef.current).toBeInstanceOf(HTMLDivElement);
+  });
+});

packages/react/src/utils/use-composed-refs.ts

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+'use client';
+
+import type { Ref, RefCallback } from 'react';
+
+import { useCallback } from 'react';
+
+type PossibleRef<T> = Ref<T> | undefined;
+
+/**
+ * Set a given ref to a given value.
+ *
+ * Handles both callback refs and RefObject(s).
+ *
+ * @returns Cleanup function if the ref callback returned one (React 19+)
+ */
+function setRef<T>(ref: PossibleRef<T>, value: T): (() => void) | void | undefined {
+  if (typeof ref === 'function') {
+    return ref(value);
+  } else if (ref !== null && ref !== undefined) {
+    ref.current = value;
+  }
+}
+
+/**
+ * Compose multiple refs into a single callback ref.
+ *
+ * @example
+ * ```tsx
+ * const composedRef = composeRefs(ref1, ref2, ref3);
+ * return <div ref={composedRef} />;
+ * ```
+ */
+export function composeRefs<T>(...refs: PossibleRef<T>[]): RefCallback<T> {
+  return (node): (() => void) | void => {
+    const cleanups = refs.map(ref => setRef(ref, node));
+
+    return () => {
+      for (let i = 0; i < cleanups.length; i++) {
+        const cleanup = cleanups[i];
+        if (typeof cleanup === 'function') {
+          cleanup();
+        } else {
+          setRef(refs[i], null);
+        }
+      }
+    };
+  };
+}
+
+/**
+ * Hook that composes multiple refs into a single callback ref.
+ *
+ * Memoized for stable reference.
+ *
+ * @example
+ * ```tsx
+ * const composedRef = useComposedRefs(forwardedRef, localRef);
+ * return <div ref={composedRef} />;
+ * ```
+ */
+export function useComposedRefs<T>(...refs: PossibleRef<T>[]): RefCallback<T> {
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  return useCallback(composeRefs(...refs), refs);
+}