Cherry-pick PR #33225 into release-3.6 (#33226)

Component commits: 541e96e Handle browserify-ignored module result for etw logger
microsoft · Sep 4, 2019 · 9cbb7ea · 9cbb7ea
1 parent cd32df6
commit 9cbb7ea
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/compiler/perfLogger.ts b/src/compiler/perfLogger.ts
@@ -36,8 +36,8 @@ namespace ts {
         etwModule = undefined;
     }
 
-    /** Performance logger that will generate ETW events if possible */
-    export const perfLogger: PerfLogger = etwModule ? etwModule : nullLogger;
+    /** Performance logger that will generate ETW events if possible - check for `logEvent` member, as `etwModule` will be `{}` when browserified */
+    export const perfLogger: PerfLogger = etwModule && etwModule.logEvent ? etwModule : nullLogger;
 
     perfLogger.logInfoEvent(`Starting TypeScript v${versionMajorMinor} with command line: ${JSON.stringify(process.argv)}`);
 }