Add preinstall script to install local sample viewer renderer package

app_web/README.md

@@ -57,4 +57,15 @@ Debugging
 * Install the [Debugger for Chrome](https://marketplace.visualstudio.com/items?itemName=msjsdiag.debugger-for-chrome) or [Debugger for Firefox](https://marketplace.visualstudio.com/items?itemName=hbenl.vscode-firefox-debug) extension for Visual Studio Code
 * Open the project directory in Visual Studio Code and select `Debug->Add Configuration->Chrome` or `Debug->Add Configuration->Firefox` so the `.vscode/launch.json` file is created.
 * Append `/app_web/dist` to `${workspaceFolder}` in the `launch.json` file
-* `Debug->Start Debugging` should now launch a Chrome or Firefox window with the sample viewer and VS Code breakpoints should be hit.
+* `Debug->Start Debugging` should now launch a Chrome or Firefox window with the sample viewer and VS Code breakpoints should be hit.
+
+### Known Issues
+npm install give the following warning:
+```
+npm WARN deprecated [email protected]: This module is not supported, and leaks memory. Do not use it. Check out lru-cache if you want a good and tested way to coalesce async requests by a key value, which is much more comprehensive and powerful.
+npm WARN deprecated [email protected]: See https://github.com/lydell/source-map-resolve#deprecated
+npm WARN deprecated [email protected]: Glob versions prior to v9 are no longer supported
+```
+These warnings come from rollup plugins copy and sourcemaps, both are dev dependencies and not used in the final distribution.\
+Sourcemap is used to make debugging of @khronosgroup/gltf-viewer possible.\
+Copy is used to copy all required files to dist.

app_web/package.json

@@ -6,6 +6,7 @@
   "module": "src/main.js",
   "type": "module",
   "scripts": {
+    "preinstall": "cd .. && npm install && npm run build",
     "build": "rollup -c",
     "dev": "concurrently \"npm run --prefix .. watch\" \"npm-watch\" \"serve --listen 8000 dist\"",
     "test": "echo \"Error: no test specified\" && exit 1",