mapper function
Implementation
Object? mapper(Object? node) {
if (node == null) {
return null;
}
if (node is AstNode) {
return dart(node);
}
if (node is TreeNode) {
return css(node);
}
var instanceMirror = reflect(node);
var symbol = instanceMirror.type.simpleName;
throw UnimplementedError(MirrorSystem.getName(symbol));
}