Implementation of SortedArray wrapper. Thanks to @JSMonk

sorted-array.ts

class SortedArray<T> {
    static of<T>(array: Array<T>): SortedArray<T> {
        return new SortedArray(array);
    }

    private readonly array: Array<T>;

    private constructor(array: Array<T>, sortingWith?: (a: T, b: T) => number) {
        this.array = Array.from(array).sort(sortingWith);
    }   
}

function expectSortedArray(arr: SortedArray<number>) {
    // do something
}

expectSortedArray([1, 2]); // Error!

expectSortedArray(SortedArray.of([1, 2]));