export type StorageErrorCode = "keychain_locked" | "authentication_required" | "key_invalidated" | "storage_corruption" | "storage_compensation_failed" | "biometric_unavailable" | "unsupported";
export type StorageCapabilities = {
    platform: "native" | "web";
    backend: {
        disk: string;
        secure: string;
    };
    writeBuffering: {
        disk: boolean;
        secure: boolean;
    };
    errorClassification: boolean;
};
export type SecurityCapabilityStatus = "available" | "unavailable" | "unknown";
export type SecurityCapabilities = {
    platform: "native" | "web";
    secureStorage: {
        backend: string;
        encrypted: SecurityCapabilityStatus;
        accessControl: SecurityCapabilityStatus;
        keychainAccessGroup: SecurityCapabilityStatus;
        hardwareBacked: SecurityCapabilityStatus;
    };
    biometric: {
        storage: SecurityCapabilityStatus;
        prompt: SecurityCapabilityStatus;
        biometryOnly: SecurityCapabilityStatus;
        biometryOrPasscode: SecurityCapabilityStatus;
    };
    metadata: {
        perKey: boolean;
        listsWithoutValues: boolean;
        persistsTimestamps: boolean;
    };
};
export type SecureStorageMetadata = {
    key: string;
    exists: boolean;
    kind: "secure" | "biometric" | "missing";
    backend: string;
    encrypted: SecurityCapabilityStatus;
    hardwareBacked: SecurityCapabilityStatus;
    biometricProtected: boolean;
    valueExposed: false;
};
export declare function getStorageErrorCode(err: unknown): StorageErrorCode | undefined;
export declare function isStorageError(err: unknown, code: StorageErrorCode): boolean;
export declare function isLockedStorageErrorCode(code: StorageErrorCode | undefined): boolean;
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