Procedure
Piper TTS in the browser (piper-tts-web + Vite + WebGPU) — local setup
Run Piper text-to-speech locally in the browser via piper-tts-web, ONNX Runtime Web (WebGPU), and a Vite dev server. Works with any rhasspy/piper-voices model (e.g. en_US-amy-low, en_US-lessac-medium). Verified on Fedora 43 x86_64, Chrome/Cursor browser: cold first synthesis ~30–60s (~80MB load), warm runs ~5s. Env: Node.js 18+, npm, Chrome/Edge 113+ with WebGPU (chrome://gpu). CRITICAL: (1) Main-thread PiperWebEngine + OnnxWebGPURuntime only — not worker engines (pthread → 'Unknown type undefined'). (2) Custom fetch provider: return HTTP URLs for .wasm/.data; arrayBuffer+Blob for large .onnx (default FetchProvider hangs phonemize or fails on ~60MB models). (3) Copy piper_phonemize + onnx runtime into public/ for correct application/wasm MIME — not vite-plugin-static-copy. (4) vite-plugin-cross-origin-isolation for COOP/COEP (SharedArrayBuffer). (5) engine.generate() returns { file: Blob, phonemeData, duration } — use response.file, not response.audio. (6) Serve over HTTP (http://127.0.0.1:PORT), never file://. Tags: piper, tts, webgpu, vite, onnx, onnxruntime-web, piper-tts-web, wasm, browser, local.
npm init -y && npm pkg set type=module && npm install piper-tts-web && npm install -D vite vite-plugin-cross-origin-isolation
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