feat: add Vite plugins for WASM support and top-level await functionality

Author: tonhowtf

package.json

@@ -77,6 +77,8 @@
     "svelte-check": "^4.0.0",
     "typescript": "~5.6.2",
     "vite": "^6.0.3",
+    "vite-plugin-top-level-await": "^1.5.0",
+    "vite-plugin-wasm": "^3.4.1",
     "vitest": "^4.1.4"
   }
 }

pnpm-lock.yaml

@@ -1,5 +1,7 @@
 import { defineConfig } from "vite";
 import { sveltekit } from "@sveltejs/kit/vite";
+import wasm from "vite-plugin-wasm";
+import topLevelAwait from "vite-plugin-top-level-await";
 import { execSync, spawnSync } from "child_process";
 import { readFileSync, existsSync } from "fs";
 import path from "path";
@@ -58,7 +60,27 @@ export default defineConfig(async ({ command }) => {
     (isBuild && process.env.OMNIGET_I18N_STRICT !== "0");
 
   return {
-    plugins: [i18nKeysPlugin({ strict: strictI18n }), sveltekit()],
+    plugins: [
+      i18nKeysPlugin({ strict: strictI18n }),
+      wasm(),
+      topLevelAwait(),
+      sveltekit(),
+    ],
+
+    // PlantUML / Graphviz packages ship WASM + workers that need special
+    // handling. `optimizeDeps.exclude` keeps the dep optimizer out of the way
+    // so vite-plugin-wasm gets to handle the wasm imports. The graphviz
+    // package internally spawns a worker — Vite 6 requires worker.format=es
+    // for code-splitting builds, otherwise it errors with "Invalid value 'iife'".
+    optimizeDeps: {
+      exclude: [
+        "@kookyleo/plantuml-little-web",
+        "@kookyleo/graphviz-anywhere-web",
+      ],
+    },
+    worker: {
+      format: "es",
+    },
 
     define: {
       __COMMIT_HASH__: JSON.stringify(gitInfo.hash),