/**
 * Terminal font size management hook.
 *
 * Manages font size state with ResttyTerminal ref integration. Calls
 * `ref.current?.setFontSize()` on every change and optionally persists
 * to localStorage via `useTerminalSettings`.
 *
 * Replaces the duplicated `useState(fontSize)` + `handleFontIncrease`/
 * `handleFontDecrease` pattern found in both interactive panels.
 *
 * @module @mks2508/mks-ui/react/blocks/Terminal/hooks/useTerminalFontSize
 *
 * @example
 * ```tsx
 * const resttyRef = useRef<IResttyTerminalRef>(null);
 * const font = useTerminalFontSize({ ref: resttyRef });
 *
 * <ResttyTerminal ref={resttyRef} fontSize={font.fontSize} />
 * <button onClick={font.increase} disabled={font.isMax}>+</button>
 * <span>{font.fontSize}px</span>
 * <button onClick={font.decrease} disabled={font.isMin}>-</button>
 * ```
 */
import type { IResttyTerminalRef } from '../restty/ResttyTerminal.types';
/**
 * Options for useTerminalFontSize.
 */
export interface IUseTerminalFontSizeOptions {
    /** Restty terminal ref for imperative font size updates. */
    ref: React.RefObject<IResttyTerminalRef | null>;
    /** Initial font size. Defaults to value from useTerminalSettings (usually 14). */
    initial?: number;
    /** Minimum font size (default: 10). */
    min?: number;
    /** Maximum font size (default: 24). */
    max?: number;
    /** Persist font size to localStorage via useTerminalSettings (default: true). */
    persist?: boolean;
}
/**
 * Return type for useTerminalFontSize.
 */
export interface IUseTerminalFontSizeReturn {
    /** Current font size in CSS pixels. */
    fontSize: number;
    /** Increase font size by 1 (clamped to max). */
    increase: () => void;
    /** Decrease font size by 1 (clamped to min). */
    decrease: () => void;
    /** Set exact font size (clamped to min/max). */
    set: (size: number) => void;
    /** Whether the font size is at minimum bound. */
    isMin: boolean;
    /** Whether the font size is at maximum bound. */
    isMax: boolean;
}
/**
 * Terminal font size management.
 *
 * Synchronizes font size state with the ResttyTerminal ref and
 * optionally persists changes to localStorage. Clamps values to
 * configurable min/max bounds.
 *
 * @param options - Font size configuration
 * @returns Font size state and mutation functions
 *
 * @example
 * ```tsx
 * const font = useTerminalFontSize({ ref: resttyRef, persist: true });
 *
 * <TerminalFontControls
 *   fontSize={font.fontSize}
 *   onIncrease={font.increase}
 *   onDecrease={font.decrease}
 *   isMin={font.isMin}
 *   isMax={font.isMax}
 * />
 * ```
 */
export declare function useTerminalFontSize(options: IUseTerminalFontSizeOptions): IUseTerminalFontSizeReturn;
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