Best common type When a type inference is made from several expressions, the types of those expressions are used to calculate a “best common

Dependencies All dependencies are managed by npm. Make sure all the declaration packages you depend on are marked appropriately in the

Polymorphic this types A polymorphic this type represents a type that is the subtype of the containing class

Write some code Let’s write our first TypeScript file using React. First, create a file named Hello.tsx in src/components

Private and protected members in classes Private and protected members in a class affect their compatibility. When an instance of a class is

Using Modules Just like namespaces, modules can contain both code and declarations. The main difference is that modules declare their

Functions with overloads When a function has overloads, each overload in the source type must be matched by a compatible signature on the target

Decorator Composition Multiple decorators can be applied to a declaration, as in the following examples:

typeof type guards Let’s go back and write the code for the version of padLeft that uses union types. We could write

Add a CopyFiles target to the build Finally, we need to make sure that the Angular files are copied as part of the build. To do this, edit the