Use ``` to comment before extend type will get "Unexpected BlockString"

[VictoriaChou]

Here is my example:

"""
The query root of XXX GraphQL interface.
"""
extend type Query {
    """
    Gets info about apple
    """
    Apple {
    }
}

And the first comment is not allowed and return Unexpected BlockString
If i remove extend or if i use # instead of """ it will be all right
The second comment is ok.

[mainpart]

can confirm that :)

[glasser]

This is spec-compliant. You can see in the spec that Description is part of ObjectTypeDefinition but not part of ObjectTypeExtension.

I think this makes some sense, because if you provide a description both on the type definition and on a type extension (or on multiple type extensions) then it would need to know how to combine the descriptions. One could imagine it being legal as one as there is only one anywhere, but that's not the choice that was made.

More discussion on the spec itself at graphql/graphql-spec#900