Publish types to npm

[johannschopplich]

Using Petite Vue in a Typescript context is tricky since no types are being published.

import { createApp } from "petite-vue";

… throws an error I can only supress with @ts-ignore (or alike).

Maybe add vite-plugin-dts to the Vite config? Would typings be relevant for others as well?

[johannschopplich]

No external plugin is needed. Kept type generation logic to a bare minimum: #29