Better entrypoint for extensions

lerna.json

@@ -1,5 +1,5 @@
 {
-  "packages": ["packages/*"],
+  "packages": ["extensions/*", "platform/*"],
   "npmClient": "yarn",
   "useWorkspaces": true,
   "version": "independent"

platform/viewer/src/App.js

@@ -1,5 +1,5 @@
 import './config';
-// Imported flat feature since is not transpiled for old browser versions
+// Polyfills
 import 'core-js/features/array/flat';
 import 'core-js/stable';
 import 'regenerator-runtime/runtime';
@@ -23,7 +23,6 @@ import initCornerstoneTools from './initCornerstoneTools.js';
 import { GenericViewerCommands, MeasurementsPanel } from './appExtensions';
 import OHIFCornerstoneExtension from '@ohif/extension-cornerstone';
 import OHIFStandaloneViewer from './OHIFStandaloneViewer';
-// ~~ EXTENSIONS
 import { OidcProvider } from 'redux-oidc';
 import PropTypes from 'prop-types';
 import { Provider } from 'react-redux';
@@ -131,6 +130,9 @@ class App extends Component {
   }
 }
 
+/**
+ * @param
+ */
 function _initExtensions(extensions) {
   const defaultExtensions = [
     GenericViewerCommands,
@@ -140,13 +142,6 @@ function _initExtensions(extensions) {
   const mergedExtensions = defaultExtensions.concat(extensions);
   extensionManager.registerExtensions(mergedExtensions);
 
-  // [
-  //   OHIFVTKExtension,
-  //   OHIFDicomPDFExtension,
-  //   OHIFDicomHtmlExtension,
-  //   OHIFDicomMicroscopyExtension,
-  // ]
-
   // Must run after extension commands are registered
   if (window.config.hotkeys) {
     hotkeysManager.setHotkeys(window.config.hotkeys, true);
@@ -160,6 +155,4 @@ function _initServers(servers) {
 }
 
 export default App;
-
-// Make our managers accessible
 export { commandsManager, extensionManager, hotkeysManager };

platform/viewer/src/index.js

@@ -1,26 +1,47 @@
 /**
  * Entry point for development and production PWA builds.
- * Packaged (NPM) builds go through `index_publish.js`
+ * Packaged (NPM) builds go through `index-umd.js`
  */
 import App from './App.js';
 import React from 'react';
 import ReactDOM from 'react-dom';
 
-// EXTENSIONS
+/**
+ * EXTENSIONS
+ * =================
+ *
+ * Importing and modifying the extensions our app uses HERE allows us to leverage
+ * tree shaking and a few other niceties. However, by including them here they become
+ * "baked in" to the published application.
+ *
+ * Depending on your use case/needs, you may want to consider not adding any extensions
+ * by default HERE, and instead provide them via the configuration specified at
+ * `window.config.extensions`, or by using the exported `App` component, and passing
+ * in your extensions as props.
+ */
 import OHIFVTKExtension from '@ohif/extension-vtk';
 import OHIFDicomHtmlExtension from '@ohif/extension-dicom-html';
 import OHIFDicomMicroscopyExtension from '@ohif/extension-dicom-microscopy';
 import OHIFDicomPDFExtension from '@ohif/extension-dicom-pdf';
 
 // Default Settings
-window.config = window.config || {};
-window.config.extensions = [OHIFVTKExtension];
-
+let config = {};
 const appDefaults = {
   routerBasename: '/',
   relativeWebWorkerScriptsPath: '',
 };
-const appProps = Object.assign({}, appDefaults, window.config);
+
+if (window) {
+  config = window.config || {};
+  config.extensions = [
+    OHIFVTKExtension,
+    OHIFDicomHtmlExtension,
+    OHIFDicomMicroscopyExtension,
+    OHIFDicomPDFExtension,
+  ];
+}
+
+const appProps = Object.assign({}, appDefaults, config);
 
 // Create App
 const app = React.createElement(App, appProps, null);