Random TS error

class Random implements IRandom {
    generateArray<T>(method: string): Array<T>;
    generateArray<T>(Constructor: new () => T): Array<T>;
    generateArray(method: any) {
        return new Array<any>();
    }
}

interface IRandom {
    generateArray<T>(method: string): Array<T>;
    generateArray<T>(Constructor: new () => T): Array<T>;
}