import type { AuthSession, StorageKind } from './types.ts';
/** Minimal in-memory `Storage` stand-in for environments without Web Storage. */
export declare class MemoryStorage implements Storage {
    #private;
    get length(): number;
    clear(): void;
    getItem(key: string): string | null;
    key(index: number): string;
    removeItem(key: string): void;
    setItem(key: string, value: string): void;
}
/** Resolve a storage option to a concrete `Storage`, falling back to memory when Web Storage throws. */
export declare function resolveStorage(kind: StorageKind | Storage | undefined): Storage;
export declare function isValidSession(value: unknown, now?: number): value is AuthSession;
export declare function readSession(storage: Storage, key: string, now?: number): AuthSession | null;
export declare function writeSession(storage: Storage, key: string, session: AuthSession | null): void;
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