Use Union Types Don’t write overloads that differ by type in only one argument position:

Integrating with Build Tools You might have some more build steps in your pipeline. Perhaps you concatenate something to each of your files

Install our dependencies Now we can use npm install to install packages. First install TypeScript and gulp globally. (You might

Method Decorators A Method Decorator is declared just before a method declaration. The decorator is applied to the Property Descriptor

Import a single export from a module import { ZipCodeValidator } from "./ZipCodeValidator"; let

The Impact of ES6 on Module Plugins Some plugins add or modify top-level exports on existing modules. While this is legal in CommonJS and other

Scoping rules var declarations have some odd scoping rules for those used to other languages. Take the following example:

Abstract Classes Abstract classes are base classes from which other classes may be derived. They may not be instantiated directly. Unlike an

Static Properties Up to this point, we’ve only talked about the instance members of the class, those that show up on the object when

Generic Constraints If you remember from an earlier example, you may sometimes want to write a generic function that works on a set of types