Add TypeScript definitions

Add TypeScript definition

Remove unnecessary definition

Update definitions

* separate files
* remove unnecessary `{[key: string]: any}`
* from singular to plural

Update definitions

* Add more definitions
* Rename filename and interface
* Sort definitions
* Fix indent

Fix

Add test

* add test
* fix some definitions
* fix typo

Fix ComputedOptions

Update Vue.set

Update definitions

Add npm script