unwrapUndefinableReturn input as T if the passed input is not undefined. Otherwise, throw TypeError. function unwrapUndefinable<T>(input: Undefinable<T>): NotUndefined<T>;§unwrapUndefinable<T>(input: Undefinable<T>): NotUndefined<T>[src]§Type Parameters§T[src]§Parameters§input: Undefinable<T>[src]§Return Type§NotUndefined<T>[src]