Use 'noop' for NullLogger

Author: mrcrane

src/compiler/core.ts

@@ -4,8 +4,6 @@ namespace ts {
     export const versionMajorMinor = "3.6";
     /** The version of the TypeScript compiler release */
     export const version = `${versionMajorMinor}.0-dev`;
-
-    perfLogger.logInfoEvent(`Starting TypeScript v${versionMajorMinor} with command line: ${JSON.stringify(process.argv)}`);
 }
 
 namespace ts {

src/compiler/perfLogger.ts

@@ -1,69 +1,28 @@
 /* @internal */
 namespace ts {
-    export type PerfLogger = typeof import("@microsoft/typescript-etw"); // tslint:disable-line:no-implicit-dependencies
-
-    export class NullLogger implements PerfLogger {
-        logEvent(_msg: string): void {
-            return;
-        }
-        logErrEvent(_msg: string): void {
-            return;
-        }
-        logPerfEvent(_msg: string): void {
-            return;
-        }
-        logInfoEvent(_msg: string): void {
-            return;
-        }
-        logStartCommand(_command: string, _msg: string): void {
-            return;
-        }
-        logStopCommand(_command: string, _msg: string): void {
-            return;
-        }
-        logStartUpdateProgram(_msg: string): void {
-            return;
-        }
-        logStopUpdateProgram(_msg: string): void {
-            return;
-        }
-        logStartUpdateGraph(): void {
-            return;
-        }
-        logStopUpdateGraph(): void {
-            return;
-        }
-        logStartResolveModule(_name: string): void {
-            return;
-        }
-        logStopResolveModule(_success: string): void {
-            return;
-        }
-        logStartParseSourceFile(_filename: string): void {
-            return;
-        }
-        logStopParseSourceFile(): void {
-            return;
-        }
-        logStartReadFile(_filename: string): void {
-            return;
-        }
-        logStopReadFile(): void {
-            return;
-        }
-        logStartBindFile(_filename: string): void {
-            return;
-        }
-        logStopBindFile(): void {
-            return;
-        }
-        logStartScheduledOperation(_operationId: string): void {
-            return;
-        }
-        logStopScheduledOperation(): void {
-            return;
-        }
-    }
+    type PerfLogger = typeof import("@microsoft/typescript-etw"); // tslint:disable-line:no-implicit-dependencies
+    const nullLogger: PerfLogger = {
+        logEvent: noop,
+        logErrEvent: noop,
+        logPerfEvent: noop,
+        logInfoEvent: noop,
+        logStartCommand: noop,
+        logStopCommand: noop,
+        logStartUpdateProgram: noop,
+        logStopUpdateProgram: noop,
+        logStartUpdateGraph: noop,
+        logStopUpdateGraph: noop,
+        logStartResolveModule: noop,
+        logStopResolveModule: noop,
+        logStartParseSourceFile: noop,
+        logStopParseSourceFile: noop,
+        logStartReadFile: noop,
+        logStopReadFile: noop,
+        logStartBindFile: noop,
+        logStopBindFile: noop,
+        logStartScheduledOperation: noop,
+        logStopScheduledOperation: noop,
+    };
 
     // Load optional module to enable Event Tracing for Windows
     // See https://github.com/microsoft/typescript-etw for more information
@@ -77,5 +36,8 @@ namespace ts {
         etwModule = undefined;
     }
 
-    export const perfLogger: PerfLogger = etwModule ? etwModule : new NullLogger();
-}
+    /** Performance logger that will generate ETW events if possible */
+    export const perfLogger: PerfLogger = etwModule ? etwModule : nullLogger;
+
+    perfLogger.logInfoEvent(`Starting TypeScript v${versionMajorMinor} with command line: ${JSON.stringify(process.argv)}`);
+}

src/compiler/tsconfig.json

@@ -7,10 +7,10 @@
     "references": [],
 
     "files": [
-        "perfLogger.ts",
         "core.ts",
         "debug.ts",
         "performance.ts",
+        "perfLogger.ts",
         "semver.ts",
 
         "types.ts",