/**
 * Whether a visit says where the person came from. The browser uses this to
 * decide which visits to keep as first and last touch, and the server uses the
 * same share-link rules to derive `referral_source`, so the two can't drift.
 */
export interface AttributionTouch {
    ref?: string;
    via?: string;
    utm_source?: string;
    utm_medium?: string;
    utm_campaign?: string;
    utm_content?: string;
    utm_term?: string;
    gclid?: string;
    msclkid?: string;
    vector_source?: string;
    landing_path?: string;
    landing_referrer?: string;
    site_referrer?: string;
}
export declare function shareLandingSource(path: string | undefined): "clip_share" | "plan_share" | undefined;
export declare function isFirstPartyHost(host: string | undefined): boolean;
/**
 * Whether a referrer host says where someone came from. Moving between our own
 * apps and the marketing site, a local dev server, or returning from Google
 * sign-in is navigation, not a source. The browser and the server both use
 * this, so capture and `referral_source` agree.
 */
export declare function isSourceReferrerHost(host: string | undefined): boolean;
export declare function hasAttributionSource(touch: AttributionTouch | null | undefined): boolean;