Add the typings for the project

[tbhaxor]

Is your feature request related to a problem? Please describe. Due to the lack of typing, it is kinda headache for typescript developers

Describe the solution you'd like Extend existing vue types and link it with the project.

[Moghul]

Agreed, I just tried to implement this in a vue-ts project and for the life of me I can't get it to work.

There are several issues:

The extension definitions are wrong, and don't take args despite the fact that they could:

The actual plugin definition is broken. You've made it a type, so it can't be used as a value: