added obesity warning

it's the responsible thing to do - at the very least, this should help
avoid accidental bloat

note the inline comment though

Author: FND

lib/index.js

@@ -1,6 +1,7 @@
 "use strict";
 
 let Bundle = require("./bundle");
+let path = require("path");
 
 module.exports = (config, assetManager, { watcher, browsers, compact } = {}) => {
 	let bundles = config.map(bundleConfig => {
@@ -21,15 +22,21 @@ module.exports = (config, assetManager, { watcher, browsers, compact } = {}) =>
 	watcher.on("edit", filepaths => {
 		bundles.forEach(bundle => {
 			let res = bundle.recompile(...filepaths);
-			res && res. // guards against irrelevant changes
-				then(makeWriter(bundle, assetManager));
+			res && // guards against irrelevant changes
+				res.then(makeWriter(bundle, assetManager));
 		});
 	});
 	return res; // XXX: akward? only reports the initial compilation's status
 };
 
 function makeWriter(bundle, assetManager) {
 	return ({ code, error }) => {
+		if(code.length > 100000) { // ~100 kB -- XXX: arbitrary -- TODO: configurable
+			console.error("☝️ this bundle looks to be fairly big, you might " +
+					"want to double-check whether that's intended and " +
+					"consider performance implications for your users:\n  " +
+					path.relative(assetManager.referenceDir, bundle.target));
+		}
 		assetManager.writeFile(bundle.target, code, error);
 	};
 }