/**
 * Applies a sweeping gradient animation to a plain text string.
 * A bright spot moves left-to-right across the text.
 *
 * @param text - Plain text to colorize (no ANSI codes)
 * @param offset - Current animation offset (0-1, wraps around)
 * @param color - Optional hex color override (defaults to green accent)
 * @param fadeProgress - 0 = full animation, 1 = fully idle (flattens gradient)
 * @returns Chalk-colored string
 */
export declare function applyGradientSweep(text: string, offset: number, color?: string, fadeProgress?: number): string;
/**
 * Manages the gradient sweep animation state.
 * Call `start()` when agent begins working, `stop()` when idle.
 * On each tick, call `getOffset()` to get the current sweep position.
 */
export declare class GradientAnimator {
    private offset;
    private intervalId;
    private onTick;
    private _isFadingOut;
    private _isFadingIn;
    private _fadeProgress;
    constructor(onTick: () => void);
    start(): void;
    /**
     * Smoothly fade the gradient to idle state over ~500ms.
     */
    fadeOut(): void;
    stop(): void;
    getOffset(): number;
    /** 0 = full animation, 1 = fully idle. Use to interpolate colors. */
    getFadeProgress(): number;
    isFadingOut(): boolean;
    isFadingIn(): boolean;
    isRunning(): boolean;
}
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