export type ProgressTimerProps = {
    /** Step messages, most recent last. Shows at most 3; older ones fade out. */
    messages: readonly string[];
    /**
     * Expected total duration in seconds (provided by the backend).
     * Used to drive the logarithmic progress bar: progress accelerates
     * quickly at the start then slows down, and is capped at 95% so the
     * bar never reaches full before the backend responds.
     * Undefined until the first placeholder event arrives; the bar stays at 0.
     */
    totalExpectedDuration?: number;
    /**
     * Unix timestamp (ms) when generation started. When provided the elapsed
     * timer and progress bar resume from that point instead of resetting to
     * zero on mount — needed when the component re-mounts after the user
     * leaves and returns to a modal while generation is still in progress.
     */
    generationStartedAt?: number;
    /**
     * When true, the background behind the overlay is already CSS-blurred,
     * so backdrop-blur and the mask gradient are skipped to avoid double-blur.
     */
    loadingBlur?: boolean;
    className?: string;
};
export declare function ProgressTimer({ messages, totalExpectedDuration, generationStartedAt, loadingBlur, className, }: ProgressTimerProps): import("react").JSX.Element;
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