3rd-party types

One can usually obtain types from 3rd party libraries through the following means:

• The library itself publishes .d.ts definitions along with the package, referencing it on the typings key of package.json;

• Someone publishes types for the library at the DefinitelyTyped repository, available through npm @types/<lib>;

• There are methods for manually declaring a 3rd party library's types inside the consumer project;

What if the library does not have types?

• The library will be imported as any but you can continue to use it as-is;

• If noImplicitAnyis turned on, a declare "library" entry must be declared in a global file;

3rd party typescript types are also used to power JS type completion in VS Code.