Allow IMJS_URL_PREFIX to be configured at runtime (#70)

Author: wgoehrig

packages/react-scripts/config/webpack.config.js

@@ -136,6 +136,10 @@ module.exports = function (webpackEnv) {
 
   const shouldUseReactRefresh = env.raw.FAST_REFRESH;
 
+  if (env.raw.IMJS_URL_PREFIX === undefined) {
+    env.stringified["process.env"].IMJS_URL_PREFIX = `(globalThis.IMJS_URL_PREFIX ?? "")`;
+  }
+
   // common function to get style loaders
   const getStyleLoaders = (cssOptions, preProcessor) => {
     const loaders = [

packages/react-scripts/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@bentley/react-scripts",
-  "version": "4.0.5",
+  "version": "4.0.6",
   "description": "iModel.js configuration and scripts for Create React App.",
   "repository": {
     "type": "git",