refactor: migrate to bun bundler

build.ts

@@ -0,0 +1,71 @@
+import { build, type BuildOptions, context } from "esbuild";
+import CssModulesPlugin from "esbuild-css-modules-plugin";
+
+import { copyFileSync, readFileSync, writeFileSync } from "fs";
+import { join } from "path";
+import os from "os";
+
+const isLocal = process.argv.includes("--local");
+const isWatch = process.argv.includes("--watch");
+
+const options: BuildOptions = {
+	entryPoints: ["src/app.tsx"],
+	outfile: "./dist/jellyfin-spicetify.js",
+	bundle: true,
+	minify: isLocal,
+	platform: "browser",
+	external: ["react", "react-dom"],
+	plugins: [
+		CssModulesPlugin({ pattern: "jellyfin-spicetify__[local]", localsConvention: "camelCaseOnly" }),
+		{
+			name: "external-global",
+			setup(build) {
+				build.onResolve({ filter: /^(react|react-dom)$/ }, (args) => ({
+					path: args.path,
+					namespace: "external-global",
+				}));
+				build.onLoad({ filter: /.*/, namespace: "external-global" }, (args) => ({
+					contents: `module.exports = Spicetify.${args.path === "react" ? "React" : "ReactDOM"};`,
+				}));
+			},
+		},
+		{
+			name: "on-end",
+			setup(build) {
+				build.onEnd(() => {
+					const js = readFileSync("./dist/jellyfin-spicetify.js", "utf-8");
+					const css = readFileSync("./dist/jellyfin-spicetify.css", "utf-8");
+
+					const wrapped = `(async function() {
+						while (!Spicetify.React || !Spicetify.ReactDOM) {
+							await new Promise(resolve => setTimeout(resolve, 10));
+						}
+						const s = document.createElement("style");
+						s.id = "jellyfin-spicetify";
+						s.textContent = ${JSON.stringify(css)};
+						document.head.appendChild(s);
+						${js}
+					})();`.trim();
+
+					writeFileSync("./dist/jellyfin-spicetify.js", wrapped);
+
+					if (!isLocal) {
+						const path =
+							os.platform() === "win32"
+								? join(process.env.APPDATA!, "spicetify", "Extensions", "jellyfin-spicetify.js")
+								: join(process.env.HOME!, ".config", "spicetify", "Extensions", "jellyfin-spicetify.js");
+
+						copyFileSync("./dist/jellyfin-spicetify.js", path);
+					}
+				});
+			},
+		},
+	],
+};
+
+if (isWatch) {
+	const ctx = await context(options);
+	await ctx.watch();
+} else {
+	await build(options);
+}