Configure compat config

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/vue.config.js

@@ -5,6 +5,22 @@ module.exports = {
   chainWebpack: (config) => {
     // remove the prefetch plugin
     config.plugins.delete("prefetch");
+
+    config.resolve.alias.set("vue", "@vue/compat");
+
+    config.module
+      .rule("vue")
+      .use("vue-loader")
+      .tap((options) => {
+        return {
+          ...options,
+          compilerOptions: {
+            compatConfig: {
+              MODE: 2,
+            },
+          },
+        };
+      });
   },
   pwa: {
     themeColor: "#ffd599", //not required for service worker, but place theme color here if manifest.json doesn't change the color