export interface SocialAccessConfirmation {
    allowed: boolean;
    checkedAtMillis: number;
}
/** UI preflight history only; it never grants Host/server permissions. */
export interface SocialAccessSnapshots {
    read(accountKey: string): boolean | null;
    readConfirmation?(accountKey: string): SocialAccessConfirmation | null;
    write(accountKey: string, allowed: boolean, checkedAtMillis?: number): void;
    remove(accountKey: string): void;
}
type SnapshotStorage = Pick<Storage, 'getItem' | 'setItem' | 'removeItem'>;
/** Browser origin + environment/user key isolate presentation snapshots. */
export declare class SocialAccessSnapshotStorage implements SocialAccessSnapshots {
    private readonly storage;
    constructor(storage?: () => SnapshotStorage);
    private key;
    read(accountKey: string): boolean | null;
    readConfirmation(accountKey: string): SocialAccessConfirmation | null;
    write(accountKey: string, allowed: boolean, checkedAtMillis?: number): void;
    remove(accountKey: string): void;
}
export {};
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