export type PaywallStateOptions = {
    funnelId?: string | null;
    legacyKeys?: readonly string[];
};
export declare const buildPaywallStateStorageKey: (funnelId?: string | null | undefined) => string;
export declare const readPaywallStateValue: (options?: PaywallStateOptions) => string | null;
export declare const updatePaywallStateValue: (updater: (currentValue: string | null) => string, options?: PaywallStateOptions) => string;
export declare const clearPaywallStateValue: (options?: PaywallStateOptions) => void;