Create Kokoro TTS JavaScript library (#3)

* Set up JS project

* Finalise JS library

* Update README

* Fix package.json repository url

* Rename package -> `kokoro-js`

* Fix samples in README

* Cleanup README

* Bump `phonemizer` version

* Create web demo

* Run prettier

* Link to model used in demo

* Enable multithreading in HF space demo (~40% faster)

* Add link to demo in README

* Bump to v1.0.1

kokoro.js/rollup.config.js

@@ -0,0 +1,42 @@
+import terser from "@rollup/plugin-terser";
+import { nodeResolve } from "@rollup/plugin-node-resolve";
+
+const plugins = (browser) => [nodeResolve({ browser }), terser({ format: { comments: false } })];
+
+const OUTPUT_CONFIGS = [
+  // Node versions
+  {
+    file: "./dist/kokoro.cjs",
+    format: "cjs",
+  },
+  {
+    file: "./dist/kokoro.js",
+    format: "esm",
+  },
+
+  // Web version
+  {
+    file: "./dist/kokoro.web.js",
+    format: "esm",
+  },
+];
+
+const WEB_SPECIFIC_CONFIG = {
+  onwarn: (warning, warn) => {
+    if (!warning.message.includes("@huggingface/transformers")) warn(warning);
+  },
+};
+
+const NODE_SPECIFIC_CONFIG = {
+  external: ["@huggingface/transformers", "phonemizer"],
+};
+
+export default OUTPUT_CONFIGS.map((output) => {
+  const web = output.file.endsWith(".web.js");
+  return {
+    input: "./src/kokoro.js",
+    output,
+    plugins: plugins(web),
+    ...(web ? WEB_SPECIFIC_CONFIG : NODE_SPECIFIC_CONFIG),
+  };
+});