/**
 * Checks if a function is class or instance of class
 * @param fn{*} - source function
 * @return {boolean}
 * @example
 * // How to check if a function is ES6 Class?
 * const fn = new Class();
 * const isClass = isFnClass(fn);
 * console.log(isClass); // => true
 */
export function isFnClass(fn: any): boolean;
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