Allow changing the script type, add root to visualization config

config/plugins/visualizations/common/templates/script_entry_point.mako

@@ -13,6 +13,7 @@
 <%def name="get_body()">
     ## Collect incoming data
     <% data_incoming = {
+        "root": h.url_for("/"),
         "visualization_id": visualization_id,
         "visualization_name": visualization_name,
         "visualization_plugin": visualization_plugin,
@@ -24,6 +25,7 @@
     <div id="${container}" data-incoming='${h.dumps(data_incoming)}'></div>
 
     ## Add script tag
-    <% src = script_attributes.get("src") %>
-    <script type="text/javascript" src=${src}></script>
+    <% script_src = script_attributes.get("src") %>
+    <% script_type = script_attributes.get("type") or "module" %>
+    <script type="${script_type}" src=${script_src}></script>
 </%def>

lib/galaxy/visualization/plugins/config_parser.py

@@ -221,7 +221,7 @@ class DataSourceParser:
         # when no tests are given, default to isinstance( object, model_class )
         returned["tests"] = self.parse_tests(xml_tree.findall("test"))
 
-        # to_params (optional, 0 or more) - tells the registry to set certain params based on the model_clas, tests
+        # to_params (optional, 0 or more) - tells the registry to set certain params based on the model_class, tests
         returned["to_params"] = {}
         if to_params := self.parse_to_params(xml_tree.findall("to_param")):
             returned["to_params"] = to_params