export type EmailCapturePersistenceResult<User> = {
    user: User;
    eventId: string;
    eventCreated: boolean;
    canonicalUser: User | null;
    activeSubscription: boolean;
};
export type EmailCaptureSingleFlight = {
    current: Promise<void> | null;
};
export type SubmitEmailCaptureInput<User> = {
    email: string;
    isPreview: boolean;
    singleFlight: EmailCaptureSingleFlight;
    retryPendingNavigation?: () => boolean | Promise<boolean>;
    persist: (email: string) => Promise<EmailCapturePersistenceResult<User>>;
    applyUser: (user: User) => void;
    adoptCanonicalUser: (user: User) => void;
    applyPreviewEmail: (email: string) => void;
    fanOutBrowserDestinations: (eventId: string) => void | Promise<void>;
    completeVisit: () => boolean;
    resolveNextStep: (canonicalUser: User | null, activeSubscription: boolean) => string | null;
    navigate: (stepId: string) => void;
};
export declare const createEmailCaptureSingleFlight: () => EmailCaptureSingleFlight;
export declare const submitEmailCapture: <User>(input: SubmitEmailCaptureInput<User>) => Promise<void>;