Not everything is available as a native Typescript library. Due to that sometimes you might need to use 3rd party libraries. After creating a new project with Angular CLI you will experience that VS Code does not know any libraries you have imported in the header tag and the compiler complains when you try to use this libraries. The reason is: You are missing the typings. The typings describe the functionality of the libary and make that available in your project through intellisense and for the compiler. But before you start creating your own typings do the following checks: 1. Does the vendor of the library provide the typings? If yes, install through npm 2. Are the typings available on definitely typed ? If yes, then take it from there. If this is not the case then you can do your own typings. If you want to do that properly, then you should write the complete set of typings for the library and upload to definitely typed to provide it for the community. OK, this might b