Utilities

/**
 * Merges multiple props objects, handling event handlers and class names properly
 * @param props - Props objects to merge
 * @returns Merged props object
 */
function mergeProps(...props: any[]): any;

import { mergeProps } from "react-aria";

// Merge props from multiple sources
function CustomButton(props) {
  const baseProps = {
    className: 'btn',
    onClick: () => console.log('Base click')
  };
  
  const userProps = props;
  
  const { buttonProps } = useButton(props, ref);
  
  // Safely merge all props
  const mergedProps = mergeProps(baseProps, buttonProps, userProps);
  
  return <button {...mergedProps} ref={ref} />;
}

// Merge event handlers
function EventHandlingComponent(props) {
  const internalHandler = (e) => {
    console.log('Internal handler');
    // Internal logic
  };
  
  const mergedProps = mergeProps(
    { onClick: internalHandler },
    { onClick: props.onClick }
  );
  
  // Both handlers will be called
  return <button {...mergedProps}>Click me</button>;
}

// Merge class names
function StyledComponent(props) {
  const defaultProps = { className: 'default-class' };
  const stateProps = { className: props.isActive ? 'active' : '' };
  const userProps = { className: props.className };
  
  const merged = mergeProps(defaultProps, stateProps, userProps);
  // className will be: 'default-class active user-class'
  
  return <div {...merged}>{props.children}</div>;
}

/**
 * Chains multiple callback functions into a single function
 * @param callbacks - Functions to chain together
 * @returns Chained function that calls all callbacks
 */
function chain(...callbacks: any[]): (...args: any[]) => void;

import { chain } from "react-aria";

// Chain multiple event handlers
function MultiHandlerButton(props) {
  const handleClick = (e) => {
    console.log('Button clicked');
  };
  
  const handleAnalytics = (e) => {
    analytics.track('button_click');
  };
  
  // Chain handlers together
  const chainedHandler = chain(handleClick, handleAnalytics, props.onClick);
  
  return <button onClick={chainedHandler}>Click me</button>;
}

// Chain with conditional handlers
function ConditionalChain(props) {
  const baseHandler = () => console.log('Base');
  
  const conditionalHandler = props.debug ? 
    () => console.log('Debug mode') : 
    null;
  
  // chain ignores null/undefined functions
  const handler = chain(baseHandler, conditionalHandler, props.onAction);
  
  return <button onClick={handler}>Action</button>;
}

// Chain cleanup functions
function useMultipleEffects() {
  useEffect(() => {
    const cleanup1 = setupEffect1();
    const cleanup2 = setupEffect2();
    const cleanup3 = setupEffect3();
    
    // Chain all cleanup functions
    return chain(cleanup1, cleanup2, cleanup3);
  }, []);
}

/**
 * Generates a unique ID, with optional prefix
 * @param defaultId - Default ID to use if provided
 * @returns Unique ID string
 */
function useId(defaultId?: string): string;

import { useId } from "react-aria";

// Generate unique IDs for form fields
function FormField({ label, children, id: userProvidedId }) {
  const id = useId(userProvidedId);
  const descriptionId = useId();
  
  return (
    <div>
      <label htmlFor={id}>{label}</label>
      {React.cloneElement(children, { 
        id, 
        'aria-describedby': descriptionId 
      })}
      <div id={descriptionId} className="field-description">
        Additional help text
      </div>
    </div>
  );
}

// Generate IDs for complex components
function TabsComponent({ tabs }) {
  const tabListId = useId();
  
  return (
    <div>
      <div role="tablist" id={tabListId}>
        {tabs.map((tab, index) => {
          const tabId = useId();
          const panelId = useId();
          
          return (
            <button
              key={index}
              role="tab"
              id={tabId}
              aria-controls={panelId}
            >
              {tab.title}
            </button>
          );
        })}
      </div>
      
      {tabs.map((tab, index) => {
        const panelId = useId();
        const tabId = useId();
        
        return (
          <div
            key={index}
            role="tabpanel"
            id={panelId}
            aria-labelledby={tabId}
          >
            {tab.content}
          </div>
        );
      })}
    </div>
  );
}

// Use provided ID or generate one
function AccessibleComponent({ id, label, children }) {
  const componentId = useId(id);
  const labelId = useId();
  
  return (
    <div>
      <div id={labelId}>{label}</div>
      <div 
        id={componentId}
        aria-labelledby={labelId}
      >
        {children}
      </div>
    </div>
  );
}

/**
 * Creates an object ref that can be used with forwardRef
 * @param forwardedRef - Forwarded ref from parent component
 * @returns Object ref that can be used in hooks
 */
function useObjectRef<T>(forwardedRef: ForwardedRef<T>): RefObject<T>;

import React, { forwardRef } from "react";
import { useObjectRef, useButton } from "react-aria";

// Forward refs properly in custom components
const CustomButton = forwardRef<HTMLButtonElement, ButtonProps>((props, forwardedRef) => {
  const ref = useObjectRef(forwardedRef);
  const { buttonProps } = useButton(props, ref);
  
  return (
    <button {...buttonProps} ref={ref}>
      {props.children}
    </button>
  );
});

// Use with multiple hooks that need the same ref
const ComplexInput = forwardRef<HTMLInputElement, InputProps>((props, forwardedRef) => {
  const ref = useObjectRef(forwardedRef);
  
  const { inputProps } = useTextField(props, ref);
  const { focusProps } = useFocus({ onFocus: props.onFocus }, ref);
  const { hoverProps } = useHover({ onHover: props.onHover }, ref);
  
  const combinedProps = mergeProps(inputProps, focusProps, hoverProps);
  
  return <input {...combinedProps} ref={ref} />;
});

// Imperative handle with object ref
const ImperativeComponent = forwardRef<ComponentHandle, ComponentProps>((props, forwardedRef) => {
  const ref = useObjectRef<HTMLDivElement>(null);
  
  useImperativeHandle(forwardedRef, () => ({
    focus: () => ref.current?.focus(),
    scrollIntoView: () => ref.current?.scrollIntoView(),
    getBoundingClientRect: () => ref.current?.getBoundingClientRect()
  }), []);
  
  return <div ref={ref}>{props.children}</div>;
});

/**
 * Router provider for React Aria components
 * @param props - Router provider configuration
 * @returns Provider component
 */
function RouterProvider(props: RouterProviderProps): JSX.Element;

interface RouterProviderProps {
  /** Children to provide router context to */
  children: ReactNode;
  /** Navigate function from your router */
  navigate: (path: string, options?: NavigateOptions) => void;
  /** Current pathname */
  pathname?: string;
  /** Whether router uses hash routing */
  useHref?: (href: string) => string;
}

interface NavigateOptions {
  /** Whether to replace current history entry */
  replace?: boolean;
  /** State to pass with navigation */
  state?: any;
}

import { RouterProvider } from "react-aria";
import { useNavigate, useLocation } from "react-router-dom";

// React Router integration
function App() {
  const navigate = useNavigate();
  const location = useLocation();
  
  return (
    <RouterProvider 
      navigate={navigate}
      pathname={location.pathname}
    >
      <YourApp />
    </RouterProvider>
  );
}

// Next.js integration
import { useRouter } from "next/router";

function MyApp({ Component, pageProps }) {
  const router = useRouter();
  
  return (
    <RouterProvider 
      navigate={(path, options) => {
        if (options?.replace) {
          router.replace(path);
        } else {
          router.push(path);
        }
      }}
      pathname={router.asPath}
    >
      <Component {...pageProps} />
    </RouterProvider>
  );
}

// Custom router integration
function CustomRouterApp() {
  const [pathname, setPathname] = useState('/');
  
  const navigate = useCallback((path, options) => {
    if (options?.replace) {
      history.replaceState(null, '', path);
    } else {
      history.pushState(null, '', path);
    }
    setPathname(path);
  }, []);
  
  return (
    <RouterProvider 
      navigate={navigate}
      pathname={pathname}
    >
      <YourApp />
    </RouterProvider>
  );
}

/**
 * SSR provider component that handles hydration mismatches
 * @param props - SSR provider configuration
 * @returns Provider component
 */
function SSRProvider(props: SSRProviderProps): JSX.Element;

/**
 * Hook to detect server-side rendering
 * @returns Whether currently running on server
 */
function useIsSSR(): boolean;

interface SSRProviderProps {
  /** Children to provide SSR context to */
  children: ReactNode;
}

import { SSRProvider, useIsSSR } from "react-aria";

// Wrap your app with SSRProvider
function App() {
  return (
    <SSRProvider>
      <YourApp />
    </SSRProvider>
  );
}

// Conditional rendering based on SSR
function ClientOnlyComponent() {
  const isSSR = useIsSSR();
  
  if (isSSR) {
    return <div>Loading...</div>;
  }
  
  return <InteractiveComponent />;
}

// Next.js pages/_app.js
export default function MyApp({ Component, pageProps }) {
  return (
    <SSRProvider>
      <Component {...pageProps} />
    </SSRProvider>
  );
}

// Gatsby gatsby-browser.js and gatsby-ssr.js
export const wrapRootElement = ({ element }) => (
  <SSRProvider>{element}</SSRProvider>
);

/**
 * Component that renders content only for screen readers
 * @param props - Visually hidden configuration
 * @returns Visually hidden element
 */
function VisuallyHidden(props: VisuallyHiddenProps): JSX.Element;

/**
 * Hook for visually hidden element behavior
 * @param props - Visually hidden configuration
 * @returns Visually hidden props
 */
function useVisuallyHidden(props?: VisuallyHiddenProps): VisuallyHiddenAria;

interface VisuallyHiddenProps {
  /** Children content to hide visually */
  children: ReactNode;
  /** Element type to render */
  elementType?: React.ElementType;
  /** Whether to render children inside focusable element */
  isFocusable?: boolean;
}

interface VisuallyHiddenAria {
  /** Props for the visually hidden element */
  visuallyHiddenProps: DOMAttributes<Element>;
}

import { VisuallyHidden } from "react-aria";

// Screen reader only labels
function IconButton({ icon, label, ...props }) {
  return (
    <button {...props}>
      <Icon>{icon}</Icon>
      <VisuallyHidden>{label}</VisuallyHidden>
    </button>
  );
}

// Skip links for keyboard navigation
function SkipLinks() {
  return (
    <VisuallyHidden isFocusable>
      <a href="#main-content">Skip to main content</a>
    </VisuallyHidden>
  );
}

// Accessible table headers
function DataTable() {
  return (
    <table>
      <thead>
        <tr>
          <th>
            Name
            <VisuallyHidden>(sortable column)</VisuallyHidden>
          </th>
          <th>Actions</th>
        </tr>
      </thead>
    </table>
  );
}

/**
 * Development warning utility
 * @param condition - Condition to check
 * @param message - Warning message
 */
function warn(condition: boolean, message: string): void;

/**
 * Development-only component prop validation
 * @param props - Props to validate
 * @param propTypes - Prop type definitions
 * @param componentName - Name of component
 */
function validateProps(props: any, propTypes: any, componentName: string): void;

/**
 * Get display name for debugging
 * @param Component - React component
 * @returns Display name string
 */
function getDisplayName(Component: React.ComponentType<any>): string;

import { warn } from "react-aria";

// Development warnings
function CustomComponent(props) {
  if (process.env.NODE_ENV !== 'production') {
    warn(
      !props.children && !props.label,
      'CustomComponent should have either children or a label prop'
    );
    
    warn(
      props.isDisabled && props.onPress,
      'CustomComponent: onPress will not be called when isDisabled is true'
    );
  }
  
  // Component implementation
}

// Debug component names
function withAriaLabel(Component) {
  const WrappedComponent = (props) => {
    return <Component {...props} />;
  };
  
  WrappedComponent.displayName = `withAriaLabel(${getDisplayName(Component)})`;
  
  return WrappedComponent;
}

type ForwardedRef<T> = ((instance: T | null) => void) | MutableRefObject<T | null> | null;

type RefObject<T> = { readonly current: T | null };

interface DOMAttributes<T = Element> {
  // Event handlers
  onFocus?: (e: FocusEvent<T>) => void;
  onBlur?: (e: FocusEvent<T>) => void;
  onClick?: (e: MouseEvent<T>) => void;
  onKeyDown?: (e: KeyboardEvent<T>) => void;
  onKeyUp?: (e: KeyboardEvent<T>) => void;
  
  // ARIA attributes
  'aria-label'?: string;
  'aria-labelledby'?: string;
  'aria-describedby'?: string;
  'aria-expanded'?: boolean;
  'aria-selected'?: boolean;
  'aria-checked'?: boolean;
  'aria-disabled'?: boolean;
  'aria-hidden'?: boolean;
  'aria-pressed'?: boolean;
  'aria-current'?: boolean | 'page' | 'step' | 'location' | 'date' | 'time';
  
  // HTML attributes
  id?: string;
  className?: string;
  role?: string;
  tabIndex?: number;
  style?: React.CSSProperties;
}

// Common prop patterns
interface BaseProps {
  /** Whether the component is disabled */
  isDisabled?: boolean;
  /** CSS class name */
  className?: string;
  /** Inline styles */
  style?: React.CSSProperties;
  /** Data test ID for testing */
  'data-testid'?: string;
}

interface FocusableProps extends BaseProps {
  /** Auto-focus behavior */
  autoFocus?: boolean;
  /** Exclude from tab order */
  excludeFromTabOrder?: boolean;
  /** Focus event handlers */
  onFocus?: (e: FocusEvent) => void;
  onBlur?: (e: FocusEvent) => void;
}

interface PressableProps extends FocusableProps {
  /** Press event handlers */
  onPress?: (e: PressEvent) => void;
  onPressStart?: (e: PressEvent) => void;
  onPressEnd?: (e: PressEvent) => void;
  onPressChange?: (isPressed: boolean) => void;
  onPressUp?: (e: PressEvent) => void;
}