Support ESM modules

.gitignore

@@ -1,5 +1,6 @@
 node_modules
 lib
+esm
 coverage
 dist
 .nyc_output

babel.config.js

@@ -0,0 +1,18 @@
+var modules;
+var moduleTarget = process.env['MODULE_TARGET'];
+
+if (moduleTarget === 'commonjs') {
+  modules = 'commonjs';
+} else if (moduleTarget === 'esm') {
+  modules = false;
+} else {
+  throw new Error('Wrong value for MODULE_TARGET: ' + moduleTarget);
+}
+
+module.exports = {
+  presets: [['@babel/preset-env', { modules: modules }]],
+  plugins: [
+    '@babel/plugin-proposal-object-rest-spread',
+    '@babel/plugin-transform-object-assign'
+  ]
+};

package.json

@@ -11,6 +11,7 @@
     "batch"
   ],
   "main": "lib/index.js",
+  "module": "esm/index.js",
   "types": "./types.d.ts",
   "typings": "./types.d.ts",
   "homepage": "https://github.com/pauldijou/redux-act",
@@ -27,7 +28,9 @@
   },
   "scripts": {
     "clean": "rm -rf lib",
-    "build": "babel src --out-dir lib",
+    "build:commonjs": "MODULE_TARGET=commonjs babel src --out-dir lib",
+    "build:esm": "MODULE_TARGET=esm babel src --out-dir esm",
+    "build": "yarn build:commonjs && yarn build:esm",
     "browserify": "mkdir -p dist && browserify -s ReduxAct lib/index.js > dist/redux-act.js",
     "minify": "terser dist/redux-act.js -o dist/redux-act.min.js",
     "prepublish": "yarn clean && yarn build && yarn browserify && yarn minify",