Iterated on Webpack configs until I got the inline and shell packages seemingly working

packages/react-devtools-shell/README.md

@@ -0,0 +1 @@
+Harness for testing local changes to the `react-devtools-inline` and `react-devtools-shared` packages.

packages/react-devtools-shell/package.json

@@ -2,7 +2,32 @@
   "private": true,
   "name": "react-devtools-shell",
   "version": "0.0.0",
+  "scripts": {
+    "build": "cross-env NODE_ENV=development cross-env TARGET=remote webpack --config webpack.config.js",
+    "deploy": "yarn run build && now deploy && now alias react-devtools-experimental",
+    "start": "cross-env NODE_ENV=development cross-env TARGET=local webpack-dev-server --open"
+  },
   "dependencies": {
     "react-native-web": "^0.11.5"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.1.6",
+    "@babel/plugin-proposal-class-properties": "^7.1.0",
+    "@babel/plugin-transform-flow-strip-types": "^7.1.6",
+    "@babel/plugin-transform-react-jsx-source": "^7.2.0",
+    "@babel/preset-env": "^7.1.6",
+    "@babel/preset-flow": "^7.0.0",
+    "@babel/preset-react": "^7.0.0",
+    "babel-core": "^7.0.0-bridge",
+    "babel-eslint": "^9.0.0",
+    "babel-jest": "^24.7.1",
+    "babel-loader": "^8.0.4",
+    "cross-env": "^3.1.4",
+    "css-loader": "^1.0.1",
+    "raw-loader": "^3.1.0",
+    "style-loader": "^0.23.1",
+    "webpack": "^4.26.0",
+    "webpack-cli": "^3.1.2",
+    "webpack-dev-server": "^3.3.1"
   }
 }

packages/react-devtools-shell/webpack.config.js

@@ -17,9 +17,9 @@ if (!TARGET) {
   process.exit(1);
 }
 
-const __DEV__ = NODE_ENV === 'development';
+const builtModulesDir = resolve(__dirname, '..', '..', 'build', 'node_modules');
 
-const root = resolve(__dirname, '../..');
+const __DEV__ = NODE_ENV === 'development';
 
 const GITHUB_URL = getGitHubURL();
 const DEVTOOLS_VERSION = getVersionString();
@@ -33,11 +33,9 @@ const config = {
   },
   resolve: {
     alias: {
-      'react-devtools-inline': resolve(
-        root,
-        'packages/react-devtools-inline/src/',
-      ),
-      src: resolve(root, 'src'),
+      react: resolve(builtModulesDir, 'react'),
+      'react-dom': resolve(builtModulesDir, 'react-dom'),
+      scheduler: resolve(builtModulesDir, 'scheduler'),
     },
   },
   plugins: [
@@ -54,7 +52,12 @@ const config = {
         test: /\.js$/,
         loader: 'babel-loader',
         options: {
-          configFile: resolve(root, 'babel.config.js'),
+          configFile: resolve(
+            __dirname,
+            '..',
+            'react-devtools-shared',
+            'babel.config.js',
+          ),
         },
       },
       {