/**
 * Wraps a synchronous function so that its execution time is logged.
 *
 * @param additionalText Optional text to include in the log message.
 * @returns A higher-order function that wraps the original function.
 */
export declare function timeExecutionSync<T extends (...args: any[]) => any>(additionalText?: string): (func: T) => T;
/**
 * Wraps an asynchronous function so that its execution time is logged.
 *
 * @param additionalText Optional text to include in the log message.
 * @returns A higher-order function that wraps the original async function.
 */
export declare function timeExecutionAsync<T extends (...args: any[]) => Promise<any>>(additionalText?: string): (func: T) => T;
/**
 * A class decorator that turns a class into a singleton.
 * Only one instance of the decorated class will ever be created.
 *
 * @param constructor The target class constructor.
 * @returns A new constructor that always returns the same instance.
 */
export declare function singleton<T extends {
    new (...args: any[]): any;
}>(constructor: T): T;
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