feat(logger): add pretty printing to logs if POWERTOOLS_DEV env var set to truthy value

Author: shdq

packages/logger/src/Logger.ts

@@ -6,6 +6,7 @@ import { LogItem } from './log';
 import cloneDeep from 'lodash.clonedeep';
 import merge from 'lodash.merge';
 import { ConfigServiceInterface, EnvironmentVariablesService } from './config';
+import { LogJsonIndent } from './types';
 import type {
   ClassThatLogs,
   Environment,
@@ -569,7 +570,10 @@ class Logger extends Utility implements ClassThatLogs {
 
     const consoleMethod = logLevel.toLowerCase() as keyof ClassThatLogs;
 
-    this.console[consoleMethod](JSON.stringify(log.getAttributes(), this.removeCircularDependencies()));
+    const isDevMode = this.getEnvVarsService().getDevMode();
+    const INDENTATION: LogJsonIndent = isDevMode ? LogJsonIndent.PRETTY : LogJsonIndent.COMPACT;
+
+    this.console[consoleMethod](JSON.stringify(log.getAttributes(), this.removeCircularDependencies(), INDENTATION));
   }
 
   /**

packages/logger/src/types/Logger.ts

@@ -74,3 +74,8 @@ export {
   ConstructorOptions,
   HandlerOptions
 };
+
+export const enum LogJsonIndent {
+  PRETTY = 4,
+  COMPACT = 0,
+}