/**
 * Hook that returns true only after component has mounted on the client.
 * Useful for avoiding SSR hydration mismatches with browser-only APIs.
 *
 * @example
 * ```tsx
 * function MyComponent() {
 *   const isClient = useClientOnly()
 *   if (!isClient) return null
 *   // Safe to use browser APIs here
 *   return <div>{window.innerWidth}</div>
 * }
 * ```
 */
export declare function useClientOnly(): boolean;
/**
 * Check if code is running on the server (SSR).
 * This is a simple check that doesn't cause hydration issues.
 */
export declare function isServer(): boolean;
/**
 * Check if code is running on the client (browser).
 * This is a simple check that doesn't cause hydration issues.
 */
export declare function isClient(): boolean;
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