Property validator should report the property that failed type / validator check

[velis74]

What problem does this feature solve?

Components with multiple properties might fail property validation at the most inopportune time: assigning one property will trigger property validation for all function initProps (vm, propsOptions). Stack trace will show that the issue was triggered by assigning a specific property "prop1" while validation will actually fail on "prop2". If this is combined with component actually rendering for the first time ("prop1" was the trigger), it will be unclear what property actually failed.

In my case, reported error message was:

[Vue warn]: Invalid prop type: "[object Object]" is not a constructor

This is from method function assertType (value, type, vm)

Clarify for the actual n00b error message I received: I specified prop type to be of an "enum" class declared with Object.freeze. Actual values are, naturally, Number.

What does the proposed API look like?

It would be clearer to add prop name to the message like this:

[Vue warn]: Invalid prop "propName" type: "[object Object]" is not a constructor

This would require to add propName (or just name) parameter to assertType in order to be able to include it in the message