Fortunately, we don't have to create ambient type definitions for all JavaScript libraries and frameworks we use. The community and/or the authors of these libraries have already published such definitions online; the biggest repository resides at https://github.com/DefinitelyTyped/DefinitelyTyped. During the last couple of months, the community developed a few tools for managing ambient type definitions, such as tsd and typings.
Later, Microsoft introduced an official way to manage them: using npm by providing an additional configuration in tsconfig.json. The type definitions are now distributed as scoped packages under the @types namespace and installed in node_modules.
Let's create a directory ...
