Warning when :for attribute is used, without a key attribute

[michielvandergeest]

As I'm writing up documentation on the for-loop functionality I'm realising that it's very important (in most cases) to add a key attribute when using the :for attribute.

It would be nice if the VS code plugin can display a warning when the key attribute is omitted. It's not 100% required (for example when creating a static for-loop, with no changes ever).

Ideally it would also be nice to detect wether the index is used in the key attribute, and display a warning about it (i.e. the index is not a useful value to use in the key attribute)

[uguraslan]

Ideally it would also be nice to detect wether the index is used in the key attribute, and display a warning about it (i.e. the index is not a useful value to use in the key attribute)

A warning will be added with v1.0.0 (#23)

It would be nice if the VS code plugin can display a warning when the key attribute is omitted. It's not 100% required

Now displaying a warning for that is also possible but we need to find a way to remove the warning where it is not required.