Add esm support and migrate to named export

.gitignore

@@ -27,5 +27,4 @@ tmp
 TODO.md
 package-lock.json
 browser
-index.cjs.js
-index.es.js
+dist

README.md

@@ -16,8 +16,14 @@ Use [isobject](https://github.com/jonschlinkert/isobject) if you only want to ch
 
 ## Usage
 
+with es modules
 ```js
-import isPlainObject from 'is-plain-object';
+import { isPlainObject } from 'is-plain-object';
+```
+
+or with commonjs
+```js
+const { isPlainObject } = require('is-plain-object');
 ```
 
 **true** when created by the `Object` constructor, or Object.create(null).

is-plain-object.d.ts

@@ -0,0 +1 @@
+export function isPlainObject(o: any): boolean;

index.js → is-plain-object.js

@@ -9,7 +9,7 @@ function isObject(o) {
   return Object.prototype.toString.call(o) === '[object Object]';
 }
 
-export default function isPlainObject(o) {
+export function isPlainObject(o) {
   var ctor,prot;
 
   if (isObject(o) === false) return false;

package.json

@@ -16,14 +16,20 @@
     "url": "https://github.com/jonschlinkert/is-plain-object/issues"
   },
   "license": "MIT",
-  "main": "index.cjs.js",
-  "module": "index.es.js",
-  "types": "index.d.ts",
+  "main": "dist/is-plain-object.js",
+  "module": "dist/is-plain-object.mjs",
+  "types": "is-plain-object.d.ts",
   "files": [
-    "index.d.ts",
-    "index.es.js",
-    "index.cjs.js"
+    "is-plain-object.d.ts",
+    "dist"
   ],
+  "exports": {
+    ".": {
+      "import": "./dist/is-plain-object.mjs",
+      "require": "./dist/is-plain-object.js"
+    },
+    "./package.json": "./package.json"
+  },
   "engines": {
     "node": ">=0.10.0"
   },

rollup.config.js

@@ -1,20 +1,18 @@
 export default {
-  input: './index.js',
+  input: './is-plain-object.js',
   output: [
     {
       format: 'iife',
       file: 'browser/is-plain-object.js',
-      name: 'isPlainObject',
-      exports: 'default'
+      name: 'library',
     },
     {
       format: 'cjs',
-      file: 'index.cjs.js',
-      exports: 'default'
+      file: 'dist/is-plain-object.js',
     },
     {
-      format: 'es',
-      file: 'index.es.js'
+      format: 'esm',
+      file: 'dist/is-plain-object.mjs'
     }
   ]
 }

test/browser.html

@@ -12,6 +12,8 @@
 <div id="mocha"></div>
 <script>
 
+const { isPlainObject } = library;
+
 var expect = chai.expect;
 var iframe,iframeWindow;
 var testArea = document.getElementById('mocha');

test/server.js

@@ -6,7 +6,7 @@
  */
 
 import assert from 'assert';
-import isPlainObject from '../index.js';
+import { isPlainObject } from '../is-plain-object.js';
 
 describe('Same-Realm Server Tests', function() {
   it('should return `true` if the object is created by the `Object` constructor.', function() {