diff --git a/tools/slintpad/package.json b/tools/slintpad/package.json
index 75cd10b2546..f6c971ff702 100644
--- a/tools/slintpad/package.json
+++ b/tools/slintpad/package.json
@@ -1,5 +1,5 @@
 {
-    "//": "cSpell: ignore lumino dragdrop frsource ",
+    "//": "cSpell: ignore codingame dragdrop frsource lumino ",
     "name": "slintpad",
     "version": "1.0.3",
     "description": "",
@@ -19,7 +19,8 @@
         "test:cypress_run-chromium": "cypress run --browser=chromium --e2e",
         "test:cypress_open-chromium": "cypress open --browser=chromium --e2e",
         "test:cypress_run-ff": "cypress run --browser=firefox --e2e",
-        "test:cypress_open-ff": "cypress open --browser=firefox --e2e"
+        "test:cypress_open-ff": "cypress open --browser=firefox --e2e",
+        "slintpad:prepublish": "npm run build:wasm_lsp-release && npm run build:wasm_preview-release"
     },
     "keywords": [],
     "author": "",
diff --git a/tools/slintpad/src/editor_widget.ts b/tools/slintpad/src/editor_widget.ts
index 7c93caa45e2..9683be817a2 100644
--- a/tools/slintpad/src/editor_widget.ts
+++ b/tools/slintpad/src/editor_widget.ts
@@ -1,7 +1,7 @@
 // Copyright © SixtyFPS GmbH <info@slint-ui.com>
 // SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial
 
-// cSpell: ignore lumino inmemory mimetypes printerdemo
+// cSpell: ignore edcore lumino inmemory mimetypes printerdemo
 //
 import "monaco-editor/esm/vs/editor/edcore.main.js";
 import * as monaco from "monaco-editor/esm/vs/editor/editor.api";
@@ -849,7 +849,8 @@ export class EditorWidget extends Widget {
 
     async set_demo(location: string) {
         if (location) {
-            let tag = "master";
+            const default_tag = "XXXX_DEFAULT_TAG_XXXX";
+            let tag = default_tag.startsWith("XXXX_DEFAULT_TAG_") ? "master" : default_tag;
             {
                 let found;
                 if (
diff --git a/tools/slintpad/vite.config.ts b/tools/slintpad/vite.config.ts
index 4474e73b594..9da01fe31a3 100644
--- a/tools/slintpad/vite.config.ts
+++ b/tools/slintpad/vite.config.ts
@@ -1,15 +1,12 @@
 // Copyright © SixtyFPS GmbH <info@slint-ui.com>
 // SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial
 
-// TODO: Do build and package wasm-lsp separately. Right now vite does not
-// support `exclude` in web workers!
-
-// cSpell: ignore iife lumino
+// cSpell: ignore lumino
 
 import { defineConfig, UserConfig } from "vite";
 import { VitePWA } from "vite-plugin-pwa";
 
-export default defineConfig(({ command }) => {
+export default defineConfig(() => {
     const base_config: UserConfig = {
         server: {
             fs: {
@@ -28,7 +25,14 @@ export default defineConfig(({ command }) => {
                 },
             },
         },
-        resolve: {},
+        resolve: {
+            alias: {
+                "@lsp/": "../../../lsp/pkg/",
+                "@preview/": "../../../api/wasm-interpreter/pkg/",
+                "~@lumino": "node_modules/@lumino/", // work around strange defaults in @lumino
+                path: "path-browserify", // To make path.sep available to monaco
+            },
+        },
         plugins: [
             VitePWA({
                 registerType: "autoUpdate",
@@ -50,41 +54,5 @@ export default defineConfig(({ command }) => {
         ],
     };
 
-    const global_aliases = {
-        "@lsp/": "../../../lsp/pkg/",
-        "~@lumino": "node_modules/@lumino/", // work around strange defaults in @lumino
-        path: "path-browserify", // To make path.sep available to monaco
-    };
-
-    if (command === "serve") {
-        // For development builds, serve the wasm interpreter straight out of the local file system.
-        base_config.resolve = {
-            alias: {
-                "@preview/": "../../../api/wasm-interpreter/pkg/",
-                ...global_aliases,
-            },
-        };
-    } else {
-        // For distribution builds,
-        // assume deployment on the main website where the loading file (index.js) is in the assets/
-        // sub-directory and the relative path to the interpreter is as below.
-        if (base_config.build == null) {
-            base_config.build = {};
-        }
-        base_config.build.rollupOptions = {
-            makeAbsoluteExternalsRelative: true,
-            external: [
-                "../../../../wasm-interpreter/slint_wasm_interpreter.js",
-            ],
-            ...base_config.build.rollupOptions,
-        };
-        base_config.resolve = {
-            alias: {
-                "@preview/": "../../../../wasm-interpreter/",
-                ...global_aliases,
-            },
-        };
-    }
-
     return base_config as UserConfig;
 });