import { type FirstTouchAttribution } from "./attribution.js";
export type FirstTouchSyncResult = {
    stored: true;
    firstTouch: FirstTouchAttribution;
} | {
    stored: false;
    reason: "consent_required" | "expired";
};
/**
 * `POST /_agent-native/auth/attribution` with `{ firstTouch }`: keep the
 * browser's first touch in the year-long `an_fts` cookie. Anyone may call it,
 * signed in or not, but only from this origin. The value already in the
 * cookie wins unless `preferFirstTouch` picks the new one, so a slow request
 * from another tab can't replace a better first touch it never saw. Where the
 * banner applies and the visitor hasn't accepted targeting cookies, it stores
 * nothing and clears every attribution cookie. Elsewhere it also writes the
 * browser's `an_ft` and `an_lt` again, so Safari keeps them their 30 days.
 */
export declare function createFirstTouchHandler(): import("h3").EventHandlerWithFetch<import("h3").EventHandlerRequest, Promise<{
    error: string;
    reason?: undefined;
    stored?: undefined;
    firstTouch?: undefined;
} | {
    error?: undefined;
    stored: false;
    reason: "consent_required";
    firstTouch?: undefined;
} | {
    error?: undefined;
    stored: false;
    reason: "expired";
    firstTouch?: undefined;
} | {
    error?: undefined;
    reason?: undefined;
    stored: true;
    firstTouch: FirstTouchAttribution;
}>>;