fix: compatibility with log aggregators

src/transformations/timestamp.ts

@@ -14,21 +14,15 @@
  */
 import {LogLevel} from '../logger';
 import {Transformation} from '../transformation';
-import moment from 'moment';
 
 /**
  * Transformation that adds a timestamp to output
  */
 export class Timestamp implements Transformation {
   /**
-   * Instantiate a new timestamp transformation
-   *
-   * @see https://momentjs.com/docs/#/displaying/format/
-   * @param format Format for timestamps
+   * Keep this transformation in production environments
    */
-  constructor(private readonly format = 'LLLL') {
-    // noop
-  }
+  useInProduction = true;
 
   /**
    * Add timestamp to output
@@ -37,8 +31,6 @@ export class Timestamp implements Transformation {
    * @param output Output to add timestamp to
    */
   transform(_logLevel: LogLevel, output: string): string {
-    const now = moment();
-
-    return `[${now.format(this.format)}] ${output}`;
+    return `[${new Date().toISOString()}] ${output}`;
   }
 }