TypeScript has the following disadvantages :
* TypeScript takes a long time to compile the code.
* TypeScript does not support abstract classes.
* If we run the TypeScript application in the browser, a compilation step is required to transform TypeScript into JavaScript.
* Web developers are using JavaScript from decades and TypeScript doesn?t bring anything new.
* To use any third party library, the definition file is must. And not all the third party library have definition file available.
* Quality of type definition files is a concern.
