Refactor: support web target without extension plugin

vite.config.js

@@ -1,14 +1,13 @@
 import { defineConfig } from 'vite';
-import webExtension from 'vite-plugin-web-extension';
 
 const target = process.env.TARGET || 'firefox';
 
-export default defineConfig({
+export default defineConfig(async () => {
-    build: {
+    const plugins = [];
-        outDir: `dist/${target}`,
+
-        emptyOutDir: true,
+    if (target !== 'web') {
-    },
+        const { default: webExtension } = await import('vite-plugin-web-extension');
-    plugins:[
+        plugins.push(
             webExtension({
                 manifest: () => {
                     const base = {
@@ -49,6 +48,15 @@ export default defineConfig({
                         },
                     };
                 },
-        }),
+            })
-    ],
+        );
+    }
+
+    return {
+        build: {
+            outDir: `dist/${target}`,
+            emptyOutDir: true,
+        },
+        plugins,
+    };
 });