adds rollup (#10)

package.json

@@ -7,10 +7,11 @@
   "scripts": {
     "test": "node test/index.js",
     "build:html": "npx @11ty/eleventy --config=_build/.eleventy.cjs",
-    "build": "npm run build:html",
+    "build": "npm run build:html && npm run build:js",
     "watch:html": "npx @11ty/eleventy --config=_build/.eleventy.cjs --watch",
     "watch": "npm run watch:html",
-    "build:docs": "npx typedoc --out docs src/"
+    "build:docs": "npx typedoc --out docs src/",
+    "build:js": "npx rollup -c"
   },
   "repository": {
     "type": "git",
@@ -34,6 +35,7 @@
     "htest.dev": "^0.0.4",
     "jsep": "^1.3.8",
     "markdown-it-anchor": "^8.6.7",
+    "rollup": "^2.79.1",
     "typedoc": "^0.25.3"
   }
 }

rollup.config.js

@@ -0,0 +1,26 @@
+const BASE_FILENAME = "vastly";
+const IIFE_NAME = "Vastly";
+
+function bundle(format, filenameAddition = "") {
+	let filename = BASE_FILENAME;
+
+	if (format !== "esm" && filenameAddition) {
+		filename += "." + filenameAddition;
+	}
+
+	return {
+		file: `dist/${filename}.js`,
+		name: IIFE_NAME,
+		format,
+		sourcemap: format !== "esm"
+	};
+}
+
+export default {
+	input: "src/index.js",
+	output: [
+		bundle("iife", "global"),
+		bundle("esm"),
+		bundle("cjs", "cjs"),
+	],
+};