/**
 * Checks if function is async
 * @param fn{*} - source function
 * @return {boolean}
 * @example
 * // How to check if function is async?
 * const fn = async () => {};
 * const isAsync = isFnAsync(fn);
 * console.log(isAsync); // => true
 */
export function isFnAsync(fn: any): boolean;
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