/**
 * Utility class containing various static methods for common operations.
 */
export default class Utils {
    /**
     * Checks if the application is running in a hybridless container.
     * @returns {boolean} - True if the application is running in a hybridless container, false otherwise.
     */
    static isHybridlessContainer(): boolean;
    /**
     * Checks if a given string is valid.
     * @param {string} string - The string to check.
     * @returns {boolean} - True if the string is valid, false otherwise.
     */
    static isValidString(string: string): boolean;
    /**
     * Parses a string into an integer and returns null if the string is not a valid number.
     * @param {string} str - The string to parse into an integer.
     * @returns {number | null} - The parsed integer or null if the string is not a valid number.
     */
    static parseIntNullIfNaN(str?: string): number | null;
    /**
     * Parses a JSON string and returns the resulting object. If the string is empty or
     * cannot be parsed, null is returned.
     * @param {string} string - The JSON string to parse.
     * @returns {any | null} - The parsed object or null if the string is empty or invalid.
     */
    static parseObjectNullIfEmpty(string: string | undefined): any | null;
    /**
     * Checks if a given value is a valid number.
     * @param {string} number - The value to be checked.
     * @returns {boolean} - True if the value is a valid number, false otherwise.
     */
    static isValidNumber(number: string): boolean;
    /**
     * Retrieves the value from an object using a case-insensitive key lookup.
     * @param {any} obj - The object to search for the key.
     * @param {string} key - The key to search for in the object.
     * @returns {any | null} The value associated with the key, or null if the key is not found.
     */
    static caseInsensitiveObjectForKey(obj: any, key: string): any | null;
    /**
     * Cleans out the /tmp directory asynchronously.
     */
    static cleanTemporaryFolder(): Promise<void>;
    /**
     * Marshalls the given item into a DynamoDB format.
     * If the item is an array, it maps over each element and marshalls it recursively.
     * If the item is an object, it marshalls the object using the marshall function with options to remove undefined values and convert class instances to maps.
     * If the item is neither an array nor an object, it converts the item to an attribute.
     * @param {any} item - The item to be marshalled.
     * @returns The marshalled item in DynamoDB format.
     */
    static ddbMarshall<T>(item: T, rec?: boolean): any;
    /**
     * Recursively unmarshalls a DynamoDB item by converting it into a plain JavaScript object.
     * @param {any} item - The DynamoDB item to unmarshall.
     * @returns {any} The unmarshalled JavaScript object.
     */
    static ddbUnmarshall(item: any): any;
    /**
     * helper that hashes values using SHA-256.
     * @param {unknown} raw - The raw item for conversion.
     * @returns {string} The hashed string.
     */
    static hashValue(raw: unknown): string;
}