Improved trace method

src/lib/logger.service.spec.ts

@@ -36,10 +36,17 @@ describe('NGXLogger', () => {
       [NGXLogger],
       (logger: NGXLogger) => {
         const logSpy = spyOn(<any>logger, '_log');
-
-        logger.trace('message');
-
-        expect(logSpy).toHaveBeenCalledWith(NgxLoggerLevel.TRACE, 'message', []);
+        const messageString = 'message';
+
+        logger.trace(messageString);
+        const _testStackError = new Error();
+        _testStackError.name = messageString;
+
+        expect(logSpy).toHaveBeenCalled();
+        expect(logSpy.calls.argsFor(0)[0]).toBe(NgxLoggerLevel.TRACE);
+        // We can't test the exact stack trace so we only make sure the message is included
+        expect(logSpy.calls.argsFor(0)[1]).toContain(messageString);
+        expect(logSpy.calls.argsFor(0)[2]).toEqual([]);
       }
     ));
   });

src/lib/logger.service.ts

@@ -42,7 +42,12 @@ export class NGXLogger {
   }
 
   public trace(message?: any | (() => any), ...additional: any[]): void {
-    this._log(NgxLoggerLevel.TRACE, message, additional);
+    // We manually set the stack trace using a dummy Error.
+    // This is done instead of using console.trace in _log method to ensure the stack trace is kept at the highest level possible.
+    // If the dummy error has no stack, we default to printing only the message and additional parameters.
+    const _traceDummyError = new Error();
+    _traceDummyError.name = message;
+    this._log(NgxLoggerLevel.TRACE, _traceDummyError.stack || message, additional);
   }
 
   public debug(message?: any | (() => any), ...additional: any[]): void {