⚙️ create an esm build (#65)

* build: add an esm build

* v1.1.0-0

* v1.1.0

Author: ngryman

package.json

@@ -1,13 +1,13 @@
 {
   "name": "tree-crawl",
-  "version": "1.0.5",
+  "version": "1.1.0",
   "description": "Agnostic tree traversal library.",
   "author": "Nicolas Gryman <ngryman@gmail.com> (http://ngryman.sh/)",
   "license": "MIT",
   "repository": "ngryman/tree-crawl",
   "main": "dist/tree-crawl.js",
   "browser": "dist/tree-crawl.js",
-  "module": "index.js",
+  "module": "dist/tree-crawl.ems.js",
   "jsnext:main": "index.js",
   "types": "index.d.ts",
   "engines": {

rollup.config.js

@@ -6,10 +6,13 @@ import cleanup from 'rollup-plugin-cleanup'
 export default {
   name: 'crawl',
   input: 'index.js',
-  output: {
+  output: [{
     format: 'umd',
     file: 'dist/tree-crawl.js'
-  },
+  }, {
+    format: 'es',
+    file: 'dist/tree-crawl.esm.js'
+  }],
   plugins: [
     resolve({
       jsnext: true,