diff --git a/package.json b/package.json
index b73a51dc..49751039 100644
--- a/package.json
+++ b/package.json
@@ -44,6 +44,7 @@
     "rollup-plugin-bundle-size": "^1.0.1",
     "rollup-plugin-commonjs": "^8.2.6",
     "rollup-plugin-es3": "^1.1.0",
+    "rollup-plugin-flow": "^1.1.1",
     "rollup-plugin-node-resolve": "^3.0.0",
     "rollup-plugin-nodent": "^0.1.3",
     "rollup-plugin-post-replace": "^1.0.0",
diff --git a/src/index.js b/src/index.js
index add863ec..589bae1a 100644
--- a/src/index.js
+++ b/src/index.js
@@ -14,6 +14,7 @@ import es3 from 'rollup-plugin-es3';
 import gzipSize from 'gzip-size';
 import prettyBytes from 'pretty-bytes';
 import shebangPlugin from 'rollup-plugin-preserve-shebang';
+import flow from 'rollup-plugin-flow';
 
 const readFile = promisify(fs.readFile);
 const stat = promisify(fs.stat);
@@ -43,7 +44,7 @@ export default async function microbundle(options) {
 	options.input = [].concat(
 		options.entries && options.entries.length ? options.entries : options.pkg.source || (await isDir(resolve(cwd, 'src')) && 'src/index.js') || (await isFile(resolve(cwd, 'index.js')) && 'index.js') || options.pkg.module
 	).map( file => resolve(cwd, file) );
-	
+
 	let main = resolve(cwd, options.output || options.pkg.main || 'dist');
 	if (!main.match(/\.[a-z]+$/) || await isDir(main)) {
 		main = resolve(main, `${options.pkg.name}.js`);
@@ -163,6 +164,7 @@ function createConfig(options, entry, format) {
 			input: entry,
 			external,
 			plugins: [
+				flow({ all: true }),
 				nodent({
 					exclude: 'node_modules/**',
 					noRuntime: true,
@@ -225,4 +227,4 @@ function createConfig(options, entry, format) {
 	};
 
 	return config;
-}
\ No newline at end of file
+}