Ship unminified file as ESM entrypoint

Author: jasonkarns

packages/optimizely-sdk/package.json

@@ -2,7 +2,7 @@
   "name": "@optimizely/optimizely-sdk",
   "version": "4.0.0",
   "description": "JavaScript SDK for Optimizely X Full Stack",
-  "module": "dist/optimizely.browser.es.min.js",
+  "module": "dist/optimizely.browser.es.js",
   "main": "dist/optimizely.node.min.js",
   "browser": "dist/optimizely.browser.min.js",
   "react-native": "dist/optimizely.react_native.min.js",

packages/optimizely-sdk/rollup.config.js

@@ -15,7 +15,7 @@
  */
 import { dependencies } from './package.json';
 import commonjs from '@rollup/plugin-commonjs';
-import { terser } from  'rollup-plugin-terser';
+import { terser } from 'rollup-plugin-terser';
 import resolve from '@rollup/plugin-node-resolve';
 
 const BUILD_ALL = process.env.BUILD_ALL ? true : false;
@@ -40,15 +40,23 @@ const getCjsConfigForPlatform = (platform) => {
 };
 
 const esModuleConfig = {
-  ... getCjsConfigForPlatform('browser'),
-  output: {
-    exports: 'named',
-    format: 'es',
-    file: 'dist/optimizely.browser.es.min.js',
-    plugins: [ terser() ],
-    sourcemap: true,
-  }
-}
+  ...getCjsConfigForPlatform('browser'),
+  output: [
+    {
+      exports: 'named',
+      format: 'es',
+      file: 'dist/optimizely.browser.es.js',
+      sourcemap: true,
+    },
+    {
+      exports: 'named',
+      format: 'es',
+      file: 'dist/optimizely.browser.es.min.js',
+      plugins: [terser()],
+      sourcemap: true,
+    },
+  ],
+};
 
 const umdconfig = {
   plugins: [