/** Estimated download times over representative mobile connections. */
export interface ConnectionProfile {
    label: string;
    /** Effective throughput in bytes per second. */
    bytesPerSecond: number;
}
/**
 * Speeds mirror the profiles Bundlephobia displays. Values are the effective
 * download throughput (not the advertised link rate).
 *  - Slow 3G:     ~400 Kbps  =>  50 KB/s
 *  - Emerging 4G: ~7 Mbps    => 875 KB/s
 */
export declare const CONNECTION_PROFILES: ConnectionProfile[];
/** Format a duration in seconds into a compact string (`120 ms`, `1.4 s`). */
export declare function formatDuration(seconds: number): string;
export interface DownloadEstimate {
    label: string;
    seconds: number;
    formatted: string;
}
/** Compute download-time estimates for the given (gzipped) byte count. */
export declare function downloadEstimates(bytes: number): DownloadEstimate[];
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