OCA.js | A JavaScript OCA controller library | Model View Controller library

The issue here is that you have written your plugin in TypeScript. So at a minimum, there are two type definitions:

• index.d.ts - Contains type definitions for index.ts file after compilation
• vue.d.ts - Contains your Vue.js module augmentation code for the Vue plugin.

Now your package.json has types/typings field is pointing to vue.d.ts. For TypeScript, when this library is imported, it infers the module augmentation code. It can never find at index.d.ts file. So, in your Vue component, this.$voca() will work with TS but not import { VueCoca } from 'vue-coca';

As a solution, set your types field to /index.d.ts file. Also, rename vue.d.ts to augment.d.ts for the sake of brevity. The caller of this library should then write his own typings file - *.d.ts file where he will import this file like: