Add build step

.gitattributes

@@ -0,0 +1 @@
+build/* linguist-generated

build.mjs

@@ -0,0 +1,66 @@
+import * as esbuild from 'esbuild';
+import process from 'node:process';
+
+const baseConfig = {
+	entryPoints: ['src/index.ts'],
+	bundle: true,
+	logLevel: 'info'
+};
+
+const umdConfig = {
+	...baseConfig,
+	format: 'iife',
+
+	// The following are hacks to basically make this an UMD module. No native support for that in esbuild as of today
+	globalName: 'Metamuxer',
+
+	footer: {
+		js:
+`if (typeof module === "object" && typeof module.exports === "object") Object.assign(module.exports, Metamuxer)`
+	}
+};
+
+const esmConfig = {
+	...baseConfig,
+	format: 'esm'
+};
+
+let ctxUmd = await esbuild.context({
+	...umdConfig,
+	outfile: 'dist/metamuxer.js'
+});
+let ctxEsm = await esbuild.context({
+	...esmConfig,
+	outfile: 'dist/metamuxer.mjs'
+});
+let ctxUmdMinified = await esbuild.context({
+	...umdConfig,
+	outfile: 'dist/metamuxer.min.js',
+	minify: true
+});
+let ctxEsmMinified = await esbuild.context({
+	...esmConfig,
+	outfile: 'dist/metamuxer.min.mjs',
+	minify: true
+});
+
+if (process.argv[2] === '--watch') {
+	await Promise.all([
+		ctxUmd.watch(),
+		ctxEsm.watch(),
+		ctxUmdMinified.watch(),
+		ctxEsmMinified.watch(),
+	]);
+} else {
+	ctxUmd.rebuild();
+	ctxEsm.rebuild();
+	ctxUmdMinified.rebuild();
+	ctxEsmMinified.rebuild();
+
+	await Promise.all([
+		ctxUmd.dispose(),
+		ctxEsm.dispose(),
+		ctxUmdMinified.dispose(),
+		ctxEsmMinified.dispose(),
+	]);
+}

dist/metamuxer.js

@@ -0,0 +1,6 @@
+"use strict";
+var Metamuxer = (() => {
+  // src/index.ts
+  console.log("hi");
+})();
+if (typeof module === "object" && typeof module.exports === "object") Object.assign(module.exports, Metamuxer)

dist/metamuxer.min.js

@@ -0,0 +1,2 @@
+"use strict";var Metamuxer=(()=>{console.log("hi");})();
+if (typeof module === "object" && typeof module.exports === "object") Object.assign(module.exports, Metamuxer)

dist/metamuxer.min.mjs

@@ -0,0 +1 @@
+console.log("hi");

dist/metamuxer.mjs

@@ -0,0 +1,2 @@
+// src/index.ts
+console.log("hi");

package.json

@@ -4,7 +4,8 @@
   "description": "TODO",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "build": "node build.mjs",
+    "watch": "node build.mjs --watch"
   },
   "author": "",
   "license": "MIT",