packager: Server: more consistent error handling

Reviewed By: cpojer

Differential Revision: D5137887

fbshipit-source-id: fe73f9a74ac7091fcad66d91859e2ff90733ce45

packages/metro-bundler/src/Server/index.js

@@ -507,7 +507,6 @@ class Server {
     }, error => {
       this._reporter.update({
         entryFilePath: options.entryFile,
-        error,
         type: 'bundle_build_failed',
       });
       return Promise.reject(error);
@@ -800,9 +799,11 @@ class Server {
       'Content-Type': 'application/json; charset=UTF-8',
     });
 
-    if (error.type === 'TransformError' ||
-        error.type === 'NotFoundError' ||
-        error.type === 'UnableToResolveError') {
+    if (error instanceof Error && (
+          error.type === 'TransformError' ||
+          error.type === 'NotFoundError' ||
+          error.type === 'UnableToResolveError'
+        )) {
       error.errors = [{
         description: error.description,
         filename: error.filename,
@@ -813,6 +814,7 @@ class Server {
       if (error.type === 'NotFoundError') {
         delete this._bundles[bundleID];
       }
+      this._reporter.update({error, type: 'bundling_error'});
     } else {
       console.error(error.stack || error);
       res.end(JSON.stringify({

packages/metro-bundler/src/lib/TerminalReporter.js

@@ -126,8 +126,7 @@ class TerminalReporter {
     }
   }
 
-  _logBundleBuildFailed(entryFilePath: string, error: Error) {
-    reporting.logError(terminal, 'bundling: %s', error.stack);
+  _logBundleBuildFailed(entryFilePath: string) {
     const progress = this._activeBundles.get(entryFilePath);
     if (progress != null) {
       const msg = this._getBundleStatusMessage(entryFilePath, progress, 'failed');
@@ -201,7 +200,10 @@ class TerminalReporter {
         this._logBundleBuildDone(event.entryFilePath);
         break;
       case 'bundle_build_failed':
-        this._logBundleBuildFailed(event.entryFilePath, event.error);
+        this._logBundleBuildFailed(event.entryFilePath);
+        break;
+      case 'bundling_error':
+        this._logBundlingError(event.error);
         break;
       case 'dep_graph_loaded':
         terminal.log(`${DEP_GRAPH_MESSAGE}, done.`);
@@ -221,6 +223,16 @@ class TerminalReporter {
     }
   }
 
+  /**
+   * We do not want to log the whole stacktrace for bundling error, because
+   * these are operational errors, not programming errors, and the stacktrace
+   * is not actionable to end users.
+   */
+  _logBundlingError(error: Error) {
+    const str = JSON.stringify(error.message);
+    reporting.logError(terminal, 'bundling failed: %s', str);
+  }
+
   _logWorkerChunk(origin: 'stdout' | 'stderr', chunk: string) {
     const lines = chunk.split('\n');
     if (lines.length >= 1 && lines[lines.length - 1] === '') {

packages/metro-bundler/src/lib/reporting.js

@@ -37,11 +37,13 @@ export type ReportableEvent = {
   type: 'bundle_build_done',
 } | {
   entryFilePath: string,
-  error: Error,
   type: 'bundle_build_failed',
 } | {
   entryFilePath: string,
   type: 'bundle_build_started',
+} | {
+  error: Error,
+  type: 'bundling_error',
 } | {
   type: 'dep_graph_loading',
 } | {