/**
 * GSC State Detection (copied from backend lib/gsc/indexing-stats.ts)
 * Single source of truth for GSC data state detection
 */
export interface GSCDataState {
    hasData: boolean;
    reason: 'has_data' | 'not_indexed' | 'indexed_no_impressions' | 'no_gsc_data' | 'gsc_not_synced';
    message: string;
    emoji: string;
}
interface URLWithGSCData {
    current_gsc_coverage_state?: string | null;
    current_gsc_indexing_state?: string | null;
    gsc_impressions_28d?: number | null;
    gsc_analytics_last_updated?: string | null;
}
/**
 * Detect GSC data state for a URL
 * This explains WHY a page has zero impressions and provides appropriate messaging
 */
export declare function detectGSCDataState(url: URLWithGSCData, impressions: number, clicks: number): GSCDataState;
export {};
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