Typescript support

[mathewmeconry]

Hi

In order got get better Intelij completion and proper support for Typescript it would be great if you could add a typedefinition to this repo or https://github.com/DefinitelyTyped/DefinitelyTyped/

With this you add proper support for Typescript and it's typechecking. I can help you with creating the defintion. More information about type definitions and how they work can be found here: https://www.typescriptlang.org/docs/handbook/declaration-files/templates/module-d-ts.html