Attribute type checking The first step to type checking attributes is to determine the element attributes type. This is slightly different

Global-modifying Modules A global-modifying module alters existing values in the global scope when they are imported. For

Identifying Kinds of Libraries First, we’ll review the kinds of libraries TypeScript declaration files can represent. We’ll briefly show how

Typing the function Let’s add types to our simple examples from earlier: function

String Literal Types String literal types allow you to specify the exact value a string must have. In practice string literal types combine

Weeding out Errors Like we mentioned, it’s not unexpected to get error messages after conversion. The important thing is to actually go one

Add TypeScript code Right click on src and click New Item. Then choose TypeScript File and name

Modular Libraries Some libraries only work in a module loader environment. For example, because express only works in Node.js and

React integration To use JSX with React you should use the

Variable capturing quirks Take a quick second to guess what the output of the following snippet is: