Add unhandled rejection listener

Author: robertbrignull

extensions/ql-vscode/src/extension.ts

@@ -236,6 +236,7 @@ export async function activate(
   const distributionConfigListener = new DistributionConfigListener();
   await initializeLogging(ctx);
   await initializeTelemetry(extension, ctx);
+  addUnhandledRejectionListener();
   install();
 
   const codelensProvider = new QuickEvalCodeLensProvider();
@@ -1529,6 +1530,35 @@ async function activateWithInstalledDistribution(
   };
 }
 
+function addUnhandledRejectionListener() {
+  const handler = (error: unknown) => {
+    const message = redactableError(
+      asError(error),
+    )`Unhandled error: ${getErrorMessage(error)}`;
+    // Add a catch so that showAndLogExceptionWithTelemetry fails, we avoid
+    // triggering "unhandledRejection" and avoid an infinite loop
+    showAndLogExceptionWithTelemetry(message).catch(
+      (telemetryError: unknown) => {
+        void extLogger.log(
+          `Failed to send error telemetry: ${getErrorMessage(telemetryError)}`,
+        );
+        void extLogger.log(message.fullMessage);
+      },
+    );
+  };
+
+  // "uncaughtException" will trigger whenever an exception reaches the top level.
+  // This covers extension initialization and any code within a `setTimeout`.
+  // Notably this does not include exceptions thrown when executing commands,
+  // because `commandRunner` wraps the command body and handles errors.
+  process.addListener("uncaughtException", handler);
+
+  // "unhandledRejection" will trigger whenever any promise is rejected and it is
+  // not handled by a "catch" somewhere in the promise chain. This includes when
+  // a promise is used with the "void" operator.
+  process.addListener("unhandledRejection", handler);
+}
+
 async function createQueryServer(
   qlConfigurationListener: QueryServerConfigListener,
   cliServer: CodeQLCliServer,