Advanced Combinations Some kinds of declarations can be combined across multiple declarations. For example, class C { } and interface

Generics Don’t ever have a generic type which doesn’t use its type parameter. See more details in

Babel First install Babelify and the Babel preset for ES2015. Like Uglify, Babelify mangles code, so we’ll need vinyl-buffer and gulp-sourcemaps

Downloading Getting type declarations in TypeScript 2.0 and above requires no tools apart from npm. As an example

Lay out the project Let’s start out with a new directory. We’ll name it proj for now, but you can change it to whatever you want

webpack

Preventing Name Conflicts Note that it’s possible to define many types in the global scope when writing a global declaration file. We strongly

this Learning how to use this in JavaScript is something of a rite of passage. Since TypeScript is a superset of

Symbol.species A function valued property that is the constructor function that is used to create derived objects.

Exporting a declaration Any declaration (such as a variable, function, class, type alias, or interface) can be exported by adding the export