Handle added files on dev server, don't crash server on error

scripts/createRoute.js

@@ -32,9 +32,15 @@ function serveResult (result, fileName, res, next) {
 function createRoute(app, name, route, context, dependantCaches) {
     const cache = new ContextCache(context);
     app.get(route, async function (req, res, next) {
+      const fileName = path.basename(req.originalUrl);
+
       // Multiple files may be requested at this path, calling this function in quick succession.
       // Await the previous build before re-building again.
-      await cache.promise;
+      try {
+        await cache.promise;
+      } catch {
+        // Error is reported upstream
+      }
 
       if (!cache.isBuilt()) {
         try {
@@ -57,7 +63,7 @@ function createRoute(app, name, route, context, dependantCaches) {
         }
       }
 
-      return serveResult(cache.result, path.basename(req.originalUrl), res, next);
+      return serveResult(cache.result, fileName, res, next);
     });
 
     return cache;

server.js

@@ -12,6 +12,15 @@ import yargs from "yargs";
 import ContextCache from "./scripts/ContextCache.js";
 import createRoute from "./scripts/createRoute.js";
 
+import {
+  createCesiumJs,
+  createJsHintOptions,
+  createCombinedSpecList,
+  glslToJavaScript,
+  createIndexJs,
+  buildCesium,
+} from "./scripts/build.js";
+
 const argv = yargs(process.argv)
   .options({
     port: {
@@ -37,15 +46,6 @@ const argv = yargs(process.argv)
   })
   .help().argv;
 
-import {
-  createCesiumJs,
-  createJsHintOptions,
-  createCombinedSpecList,
-  glslToJavaScript,
-  createIndexJs,
-  buildCesium,
-} from "./scripts/build.js";
-
 const outputDirectory = path.join("Build", "CesiumDev");
 
 function formatTimeSinceInSeconds(start) {
@@ -214,12 +214,22 @@ async function generateDevelopmentBuild() {
         ignoreInitial: true,
       },
     );
-    sourceCodeWatcher.on("all", async () => {
+
+    // eslint-disable-next-line no-unused-vars
+    sourceCodeWatcher.on("all", async (action, path) => {
       esmCache.clear();
       iifeCache.clear();
       workersCache.clear();
       iifeWorkersCache.clear();
       jsHintOptionsCache = undefined;
+
+      // Get the workspace token from the path, and rebuild that workspace's index.js
+      const workspaceRegex = /packages\/(.+?)\/.+\.js/;
+      const result = path.match(workspaceRegex);
+      if (result) {
+        await createIndexJs(result[1]);
+      }
+
       await createCesiumJs();
     });