diff --git a/README.md b/README.md
index cc04d922..7042674b 100644
--- a/README.md
+++ b/README.md
@@ -117,6 +117,7 @@ Here's what's coming up for Microbundle:
 - [brazilian-utils](https://github.com/brazilian-utils/brazilian-utils) Utils library for specific Brazilian businesses.
 - [react-hooks-lib](https://github.com/beizhedenglong/react-hooks-lib) A set of reusable react hooks.
 - [mdx-deck-live-code](https://github.com/JReinhold/mdx-deck-live-code) A library for [mdx-deck](https://github.com/jxnblk/mdx-deck) to do live React and JS coding directly in slides.
+- [react-router-ext](https://github.com/ri7nz/react-router-ext) An Extended [react-router-dom](https://github.com/ReactTraining/react-router/tree/master/packages/react-router-dom) with simple usage.
 
 ## 🥂 License
 
diff --git a/src/index.js b/src/index.js
index 84549fb2..13bc4af1 100644
--- a/src/index.js
+++ b/src/index.js
@@ -418,6 +418,9 @@ function createConfig(options, entry, format, writeMeta) {
 				}
 				return externalTest(id);
 			},
+			treeshake: {
+				propertyReadSideEffects: false,
+			},
 			plugins: []
 				.concat(
 					postcss({
@@ -592,9 +595,6 @@ function createConfig(options, entry, format, writeMeta) {
 			freeze: false,
 			esModule: false,
 			sourcemap: options.sourcemap,
-			treeshake: {
-				propertyReadSideEffects: false,
-			},
 			format,
 			name: options.name,
 			file: resolve(
diff --git a/test/index.test.js b/test/index.test.js
index a772ca18..a073fe7c 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -14,26 +14,34 @@ const rimraf = promisify(_rimraf);
 const FIXTURES_DIR = `${__dirname}/fixtures`;
 const DEFAULT_SCRIPT = 'microbundle';
 
-const times = (n, fn) => Array.from({ length: n }).map(i => fn(i));
 const join = (arr, delimiter = '') => arr.join(delimiter);
-const constant = konst => () => konst;
 
 const printTree = (nodes, indentLevel = 0) => {
-	const indent = join(times(indentLevel, constant('  ')));
+	const indent = '  '.repeat(indentLevel);
 	return join(
 		nodes
 			.filter(node => node.name[0] !== '.')
-			.map(
-				node =>
-					`${indent}${node.name}\n${
-						node.type === 'directory'
-							? printTree(node.children, indentLevel + 1)
-							: ''
-					}`,
-			),
+			.map(node => {
+				const isDir = node.type === 'directory';
+				return `${indent}${node.name}\n${
+					isDir ? printTree(node.children, indentLevel + 1) : ''
+				}`;
+			}),
 	);
 };
 
+const getBuildScript = async (fixturePath, defaultScript) => {
+	let pkg = {};
+	try {
+		pkg = JSON.parse(
+			await readFile(resolve(fixturePath, 'package.json'), 'utf8'),
+		);
+	} catch (err) {
+		if (err.code !== 'ENOENT') throw err;
+	}
+	return (pkg && pkg.scripts && pkg.scripts.build) || defaultScript;
+};
+
 const parseScript = (() => {
 	let parsed;
 	const prog = createProg(_parsed => (parsed = _parsed));
@@ -65,13 +73,7 @@ describe('fixtures', () => {
 			await rimraf(resolve(`${fixturePath}/.rts2_cache_es`));
 			await rimraf(resolve(`${fixturePath}/.rts2_cache_umd`));
 
-			let script;
-			try {
-				({ scripts: { build: script } = {} } = JSON.parse(
-					await readFile(resolve(fixturePath, 'package.json'), 'utf8'),
-				));
-			} catch (err) {}
-			script = script || DEFAULT_SCRIPT;
+			const script = await getBuildScript(fixturePath, DEFAULT_SCRIPT);
 
 			const prevDir = process.cwd();
 			process.chdir(resolve(fixturePath));