fix(vue): emits events on runtime

[aesteves60]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (npm run build) was run locally for affected output targets
• Tests (npm test) were run locally and passed
• Prettier (npm run prettier) was run locally and passed

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

• Event do not emit in Vue on many common components.

// will never fire!
function myChange(e) {
  console.log("custom event change !") 
}

<MyComponent @myChange="myChange" />

Issue URL:
#382

What is the new behavior?

• You can now handler on a custom event on a Vue component.

// will never fire!
function myChange(e) {
  console.log("custom event change !") 
}

<MyComponent @myChange="myChange" />

Does this introduce a breaking change?

• Yes
• No

[christian-bromann]

The implementation makes sense to me. Could we enhance the test cases for this?

[christian-bromann]

Instead of expecting an error can we just define a new variable and cast it to the type we expect it to be?

[christian-bromann]

same