toNullableFromUndefinableReturn null if input is undfined. Otherwise, return T directly. function toNullableFromUndefinable<T>(input: Undefinable<T>): Nullable<T>;§toNullableFromUndefinable<T>(input: Undefinable<T>): Nullable<T>[src]§Type Parameters§T[src]§Parameters§input: Undefinable<T>[src]§Return Type§Nullable<T>[src]