Create Kokoro TTS JavaScript library

[xenova]

This PR introduces kokoro-js, a JavaScript library for inference of Kokoro-82M (v0.19). It uses Transformers.js for ONNX inference and model caching.

Usage

First, install the kokoro-js library from NPM using:

npm i kokoro-js

You can then generate speech as follows:

import { KokoroTTS } from "kokoro-js";

const model_id = "onnx-community/Kokoro-82M-ONNX";
const tts = await KokoroTTS.from_pretrained(model_id, {
  dtype: "q8", // Options: "fp32", "fp16", "q8", "q4", "q4f16"
});

const text = "Life is like a box of chocolates. You never know what you're gonna get.";
const audio = await tts.generate(text, {
  // Use `tts.list_voices()` to list all available voices
  voice: "af_bella",
});
audio.save("audio.wav");

Example JSFiddle.

Voices/Samples

Life is like a box of chocolates. You never know what you're gonna get.

Voice	Nationality	Gender	Sample
Default (af)	American	Female	af.mp4
Bella (af_bella)	American	Female	af_bella.mp4
Nicole (af_nicole)	American	Female	af_nicole.mp4
Sarah (af_sarah)	American	Female	af_sarah.mp4
Sky (af_sky)	American	Female	af_sky.mp4
Adam (am_adam)	American	Male	am_adam.mp4
Michael (am_michael)	American	Male	am_michael.mp4
Emma (bf_emma)	British	Female	bf_emma.mp4
Isabella (bf_isabella)	British	Female	bf_isabella.mp4
George (bm_george)	British	Male	bm_george.mp4
Lewis (bm_lewis)	British	Male	bm_lewis.mp4

[hexgrad]

Thanks for the PR! @xenova Looks ready to merge after the rename to kokoro-js, correct?

[xenova]

Yep! Ready to merge! 🤗

I've been getting a few feature requests, like long-form generation, so I'll open a new PR for that later 🔥