add files

wax-prosemirror-schema/src/nodes/listItemNode.js

+const list_item = {
+  content: "block+",
+  attrs: {
+    track: { default: [] }
+  },
+  parseDOM: [
+    {
+      tag: "li",
+      getAttrs(hook, next) {
+        Object.assign(hook, {
+          track: parseTracks(hook.dom.dataset.track)
+        });
+        next();
+      }
+    }
+  ],
+  toDOM(hook, next) {
+    const attrs = {};
+    if (hook.node.attrs.track.length) {
+      attrs["data-track"] = JSON.stringify(hook.node.attrs.track);
+    }
+    hook.value = ["li", attrs, 0];
+    next();
+  },
+  defining: true
+};
+
+export default list_item;

wax-prosemirror-services/src/ListsService/ListItemService/ListItemService.js

+import { listItemNode } from "wax-prosemirror-schema";
+import Service from "wax-prosemirror-core/src/services/Service";
+
+class ListItemService extends Service {
+  boot() {}
+
+  register() {
+    this.container
+      .bind("schema")
+      .toConstantValue({ list_item: listItemNode })
+      .whenTargetNamed("node");
+  }
+}
+
+export default ListItemService;