Fix issues #4

Author: giautm

src/get-entry-point.js

@@ -0,0 +1,14 @@
+const fs = require('fs');
+
+function readPackageJSON() {
+	return JSON.parse(fs.readFileSync('./package.json'));
+}
+
+function getEntryPoint() {
+	const pkgJSON = readPackageJSON();
+	return pkgJSON.main || './index.js';
+}
+
+module.exports = {
+	getEntryPoint,
+};

src/webpack.haul.js

@@ -1,8 +1,11 @@
 const Visualizer = require('webpack-visualizer-plugin');
+const { getEntryPoint } = require('./get-entry-point');
+
+const entry = getEntryPoint();
 
 module.exports = ({platform}, {module, plugins}) => {
 	return {
-		entry: `./index.js`,
+		entry,
 		module: Object.assign(
 			{},
 			module,