Typescript complaints when using defineComponent

[furatamasensei]

Expected Behavior

The compiler should not complain when the package extended using Vue's defineComponent

Actual Behavior

Environment

• vue.js version: "^3.0.2"
• vue-chart.js version: "^3.5.1"
• chart.js version: "^2.9.4"
• npm version: 6.14.8