Cannot assign a Comment[] to node.comments.

This code:

function setComment(node: types.Node, comment: types.Comment) {
node.comments = [comment];
}

Results in the following error:
error TS2322: Type 'Comment[]' is not assignable to type 'CommentKind[]'.
Type 'Comment' is not assignable to type 'CommentKind'.
Property 'type' is missing in type 'Comment' but required in type 'CommentLine'.

Adding a "type" field to Comment doesn't help...

error TS2322: Type 'Comment[]' is not assignable to type 'CommentKind[]'.
Type 'Comment' is not assignable to type 'CommentKind'.
Type 'Comment' is not assignable to type 'CommentLine'.
Types of property 'type' are incompatible.
Type 'string' is not assignable to type '"CommentLine"'.

I believe the only resolution is to use CommentKind as the type in the function. Why are there both Command and CommentKind types? Wouldn't it be better if node.comments was of type Comment[]? Also, are the kinds exported at all by ast-types? I could only import them from 'ast-types/gen/kinds' which doesn't feel like an external api.

There are of course similar problems with Statement/StatementKind, Expression/ExpressionKind, etc. Any time code wants to directly mutate a node it cannot work with types of the base class and must always use kinds or leaf classes.