The TypeScript programming language was created by Microsoft. While JavaScript is a dynamically typed programming language. TypeScript is a strongly typed programming language. One of the advantage of this is that it will determine if your source is following the required contract of your defined classes and functions during the compilation process. This is something that JavaScript doesn’t provide since it isn’t compiled prior to being used. Thus, any issues with your JavaScript implementation will only be noticed during the execution of the JavaScript code itself. Even then, it is possible that your tests will not cover all possible cases and cause issues when your code is executed within a production environment.