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/** NOTE: constructors are of type "function" but are not callable, * without the new keyword. * This function will return true if and only if the object passed is  * a function and it is not a constructor. */export function isCallableFunction(o: any): boolean {
    if (typeof o !== "function") {        return false;    }
    const prototype = o["prototype"];
    if (!prototype) return true;
    let methods = Object.getOwnPropertyNames(prototype);
    if (methods.length !== 1) return false;
    let name: string = o.name;
    if (!name) return true;
    if (name[0].toUpperCase() === name[0]) return false;
    return true;
}