import { StorageScope } from "./Storage.types";
export declare const MIGRATION_VERSION_KEY = "__nitro_storage_migration_version__";
export declare const ESCAPE_PREFIX = "__nitro_storage_escaped__:";
export declare function escapeCollidingRawValue(value: string): string;
export declare function unescapeCollidingRawValue(value: string): string;
export type StoredEnvelope = {
    __nitroStorageEnvelope: true;
    expiresAt: number;
    payload: string;
};
export declare function isStoredEnvelope(value: unknown): value is StoredEnvelope;
export declare function assertValidScope(scope: StorageScope): void;
export type ScopedBatchItem = {
    key: string;
    scope: StorageScope;
};
export declare function assertBatchScope(items: readonly ScopedBatchItem[], scope: StorageScope): void;
export declare function prefixKey(namespace: string | undefined, key: string): string;
export declare function isNamespaced(key: string, namespace: string): boolean;
export declare function serializeWithPrimitiveFastPath<T>(value: T): string;
export declare function deserializeWithPrimitiveFastPath<T>(value: string): T;
export declare function toVersionToken(raw: unknown): string;
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