Here the example: https://codesandbox.io/s/sparkling-pine-542q4?file=/src/App.vue
I created a short example. Look at the method: iAmAMethod. I use it directly in the view template section. In that method I use a reactive data prop counter but it seems that the section of that template gets re-rendered when the var counter increments. But why does this work? I thought methods are not reactive?
In the context of Vue, values' being reactive means that their state (properties) are tracked and their setters are intercepted to trigger re-rendering.
In contrast, methods of components are not reactive, because changing their properties doesn't trigger re-rendering.
In your sample, you don't change properties of iAmAMethod method, but you change the counter data which is reactive. That's why Vue re-renders the template.
