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fix(dictation): self-host Silero VAD / onnxruntime-web assets

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Streaming dictation failed at runtime with "no available backend found /
'text/html' is not a valid JavaScript MIME type": @ricky0123/vad-web 0.0.30
defaults baseAssetPath/onnxWASMBasePath to "./" (relative to the page URL),
so the worklet, Silero model and ORT wasm/mjs were requested against the SPA
catch-all and came back as index.html.

Serve them from a fixed /vad/ instead:
- scripts/copy-vad-assets.mjs copies the 4 runtime assets (vad worklet,
  silero_vad_v5.onnx, ort-wasm-simd-threaded.jsep.{mjs,wasm}) from node_modules
  into apps/client/public/vad/ (gitignored — the ORT wasm is ~26 MB)
- client dev/build scripts run the copy first so the assets are always present
- useStreamingDictation points both path constants at "/vad/"

Verified: dev server serves all four under /vad/ with HTTP 200 and correct
Content-Type (js/wasm, never text/html); tsc clean. Prod (Docker) build runs
the copy step, so dist/vad/* ships in the image.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
claude_code
2026-06-22 17:19:11 +03:00
parent 4f0da42d88
commit 7093f184b2
4 changed files with 75 additions and 10 deletions
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59
apps/client/scripts/copy-vad-assets.mjs Normal file
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@@ -0,0 +1,59 @@
// Self-host the @ricky0123/vad-web + onnxruntime-web runtime assets under
// apps/client/public/vad/.
//
// WHY THIS EXISTS:
// Both vad-web and onnxruntime-web resolve their assets by URL *at runtime* (the
// VAD audio worklet + Silero model, and ORT's wasm/mjs backend). In vad-web
// 0.0.30 the default baseAssetPath / onnxWASMBasePath is "./" — i.e. relative to
// the current page URL — NOT a CDN. In this SPA that "./" request hits the
// client-side catch-all route and gets served index.html (text/html), so the
// onnxruntime ESM/wasm backend fails to initialize ("'text/html' is not a valid
// JavaScript MIME type"). We fix that by copying the four needed files into
// public/vad/ and pointing both path constants at the fixed absolute "/vad/".
//
// These copies are NOT committed (the ORT wasm is ~26 MB); this script runs
// before `dev` and `build` (see package.json) to repopulate them from
// node_modules. It is idempotent: it (re)creates the dir and overwrites.
import { createRequire } from "node:module";
import { fileURLToPath } from "node:url";
import path from "node:path";
import fs from "node:fs";
const require = createRequire(import.meta.url);
const here = path.dirname(fileURLToPath(import.meta.url));
const outDir = path.join(here, "..", "public", "vad");
// vad-web exposes ./package.json, so derive its dist dir from there.
const vadDist = path.join(
path.dirname(require.resolve("@ricky0123/vad-web/package.json")),
"dist",
);
// onnxruntime-web's "exports" map does NOT expose ./package.json, so resolving
// it would throw ERR_PACKAGE_PATH_NOT_EXPORTED. It DOES export the exact asset
// subpaths we need, so resolve those files directly.
const ortMjs = require.resolve(
"onnxruntime-web/ort-wasm-simd-threaded.jsep.mjs",
);
const ortWasm = require.resolve(
"onnxruntime-web/ort-wasm-simd-threaded.jsep.wasm",
);
// [absolute source path, output filename]
const files = [
[path.join(vadDist, "vad.worklet.bundle.min.js"), "vad.worklet.bundle.min.js"],
[path.join(vadDist, "silero_vad_v5.onnx"), "silero_vad_v5.onnx"],
[ortMjs, "ort-wasm-simd-threaded.jsep.mjs"],
[ortWasm, "ort-wasm-simd-threaded.jsep.wasm"],
];
fs.mkdirSync(outDir, { recursive: true });
for (const [src, name] of files) {
if (!fs.existsSync(src)) {
console.error(`[copy-vad-assets] missing source: ${src}`);
process.exit(1);
}
fs.copyFileSync(src, path.join(outDir, name));
console.log(`[copy-vad-assets] ${name}`);
}