The TypeScript language specification has full details about the language.. Visual Studio Code includes TypeScript language support but does not include the TypeScript compiler, The easiest way to install TypeScript is through npm, the Let's start with a simple Hello World Node.js example. For example, if you assign a number to The TypeScript language service has a powerful set of diagnostics to find common coding issues. The first way requires that By default, enums are assigned numbers that start at Enums are by default assigned numbers, however, string values can also be assigned to an enum.If the type of a variable is not known and we don't want the type checker to complain at compilation time, then the type of When there is no type associated with something, the Fortunately, you don' have to specify types absolutely everywhere in your code because TypeScript has what is called TypeScript can infer types during variable initialization, when default parameter values are set, and while determining function return values.In the above example, since TypeScript is told that both parameters to the When a type is being inferred from multiple possible types, TypeScript uses a In the above example, the array is composed of both When the Type Inference system is not enough, you will need to declare types on variables and objects.One way to put together multiple type annotations is by using an interface.To make things confusing, TypeScript also allows you to specify multiple type annotations using a type alias.What seems to be the best practice in terms of using an interface or a type alias is that you should generally just pick either If you want to get a more detailed comparison between the type alias and an interface, I would recommend Instead of creating a re-usable interface, it might be more appropriate to annotate a type inline instead.There are situations where the specific type of a variable doesn't matter, but a relationship between the types of different variables should be enforced.
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