Run Parakeet TDT in the inference worker via parakeet.js on the shared onnxruntime-web

Adds parakeet.js 1.4.4 (MIT) as a devDependency bundled into the worker
only; a build plugin keeps its own onnxruntime-web copy out of the bundle.
Includes an opt-in real-model test (PARAKEET_REAL=1).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/build.ts

@@ -17,6 +17,7 @@ import { join, relative } from "node:path";
 import { injectPrecacheManifest, precachePathsFromOutputs } from "../src/pwa/precache.ts";
 import { ensureFonts, FONTS_DIR } from "./fonts.ts";
 import { ensureIcons, ICON_SIZES, ICONS_DIR } from "./generate-icons.ts";
+import { ortAliasPlugin } from "./ortAlias.ts";
 
 const ROOT = join(import.meta.dir, "..");
 const DIST = join(ROOT, "dist");
@@ -50,6 +51,8 @@ const workerBuild = await Bun.build({
   target: "browser",
   format: "esm",
   minify: true,
+  // One onnxruntime in the bundle (D-WS7a).
+  plugins: [ortAliasPlugin],
 });
 const workerScript = await workerBuild.outputs[0]!.text();
 await Bun.write(join(DIST, "inference.worker.js"), workerScript);

scripts/ortAlias.ts

@@ -0,0 +1,23 @@
+/**
+ * Bun build plugin: parakeet.js's bare `onnxruntime-web` import resolves to
+ * `src/worker/ortShim.ts` (= Transformers.js's `onnxruntime-web/webgpu`), so
+ * the inference worker bundles exactly one onnxruntime (D-WS7a). Used by the
+ * production build (scripts/build.ts) and the dev server's worker bundle
+ * (src/index.ts). Without it the bundle carries parakeet.js's own 1.24.1
+ * copy as well — never executed, but ~0.5 MB of dead weight and a CDN
+ * wasmPaths default.
+ */
+
+import type { BunPlugin } from "bun";
+import { join } from "node:path";
+
+const SHIM = join(import.meta.dir, "../src/worker/ortShim.ts");
+
+export const ortAliasPlugin: BunPlugin = {
+  name: "parakeet-ort-alias",
+  setup(build) {
+    build.onResolve({ filter: /^onnxruntime-web$/ }, (args) =>
+      /[\\/]parakeet\.js[\\/]/.test(args.importer) ? { path: SHIM } : undefined,
+    );
+  },
+};