/**
 * Default value for metadata key, to keep collection tracking
 * eg. This model new Model('User', schema, options), will generate documents -> document._type = 'User'
 */
export declare const MODEL_KEY = "_type";
/**
 * Key to add document metadata identifier
 * This key will store the value of the key,
 * key -> document, document.id === key
 */
export declare const DEFAULT_ID_KEY = "id";
/**
 * Default scope name.
 */
export declare const DEFAULT_SCOPE = "_default";
/**
 * Default collection name.
 */
export declare const DEFAULT_COLLECTION = "_default";
/**
 * Default KeyGenerator function.
 */
export declare const KEY_GENERATOR: ({ metadata }: {
    metadata: any;
}) => string;
/**
 * Default KeyGeneratorDelimiter value.
 */
export declare const KEY_GENERATOR_DELIMITER = "::";
/**
 * Internal KeyGenerator function.
 * @param keyGen
 * @param metadata
 * @param id
 */
export declare const _keyGenerator: (keyGen: any, { metadata, id }: {
    metadata: any;
    id: any;
}, delimeter?: string) => any;
export declare const validateDelimiter: (delimiter: string) => void;
export declare const DEFAULT_MAX_EXPIRY = 0;