To Be Or Not To Be — TypeScript

// Time:  O(1)
// Space: O(1)

type ToBeOrNotToBe = {
    toBe: (val: any) => boolean;
    notToBe: (val: any) => boolean;
};

function expect(val: any): ToBeOrNotToBe {
    return {
        toBe: (val2: any): boolean => {
            if (val !== val2) {
                throw new Error("Not Equal");
            }
            return true;            
        },
        notToBe: (val2: any): boolean => {
            if (val === val2) {
                throw new Error("Equal");
            }
            return true;            
        }
    };
};