import type React from 'react';
export interface FallbackCandidate {
    providerId: string;
    model: string;
}
export interface FallbackOverlayProps {
    requestId: string;
    from: {
        providerId: string;
        model: string;
    };
    status: number;
    candidates: FallbackCandidate[];
    autoSwitchSeconds: number;
    selected: number;
    /** Called when the user manually picks a model (Enter or countdown expiry on selected). */
    onChoose: (choice: {
        providerId: string;
        model: string;
    } | null) => void;
    /** Called when the selection should move (up/down arrows). */
    onMove: (delta: number) => void;
}
/**
 * Fallback model overlay — shown when `provider.fallback_pending` fires.
 *
 * Displays the failed model, a list of fallback candidates, and a countdown.
 * The user can:
 * - Use ↑/↓ to highlight a candidate and press Enter to pick it.
 * - Press Esc to accept the auto-switch (null → chain head).
 * - Wait for the countdown to expire → auto-switch to the highlighted entry.
 *
 * The overlay always appears on top of whatever else is rendered, ensuring
 * the user is notified on every model switch — even when a fallback list
 * is already visible elsewhere.
 */
export declare function FallbackOverlay({ from, status, candidates, autoSwitchSeconds, selected, onChoose, onMove, }: FallbackOverlayProps): React.ReactElement;
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