Understand TypeScript Data Types
In the previous article and companion video of this series you prepared an ASP.NET Core project in Visual Studio to use TypeScript. You also developed a simple "Hello World" example. Now let's move ahead and learn something about the data types supported by TypeScript.
http://www.binaryintellect.net/articles/925a24c7-7301-468c-b00a-a4ecb7134282.aspx