Type check guard to see if provided AST node is a CSS based AST.CSS.Node.
WARN: Good to know: they're not same (complaint) with css-tree specification!
css-tree
Supported AST node to narrow down its inferred type
@NO_SIDE_EFFECTS
Type check guard to see if provided AST node is a CSS based AST.CSS.Node.
WARN: Good to know: they're not same (complaint) with
css-treespecification!