import type { BrowserAdapter } from "@sudobility/webgraph_parser";
export interface PerformanceResourceSummary {
    name: string;
    initiatorType: string;
    durationMs: number;
    transferSizeBytes: number;
    renderBlockingStatus?: string;
}
export interface PerformanceSnapshot {
    ttfbMs: number | null;
    domContentLoadedMs: number | null;
    loadEventMs: number | null;
    resourceCount: number;
    totalTransferSizeBytes: number;
    scriptTransferSizeBytes: number;
    stylesheetTransferSizeBytes: number;
    imageTransferSizeBytes: number;
    slowResources: PerformanceResourceSummary[];
    largestResources: PerformanceResourceSummary[];
    duplicateResourceUrls: Array<{
        url: string;
        count: number;
    }>;
    renderBlockingResourceCount: number;
}
export declare function capturePerformanceSnapshot(adapter: BrowserAdapter): Promise<PerformanceSnapshot>;
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