Allow a logger instance to be injected via the configuration

src/server.js

@@ -42,7 +42,7 @@ export default function hypernova(userConfig, onServer) {
     config.listenArgs = [config.port, config.host];
   }
 
-  logger.init(config.logger);
+  logger.init(config.logger, config.loggerInstance);
 
   const app = createApplication();
 

src/utils/logger.js

@@ -10,14 +10,18 @@ const OPTIONS = {
 };
 
 const loggerInterface = {
-  init(config) {
-    const options = { ...OPTIONS, ...config };
-
-    logger = new winston.Logger({
-      transports: [
-        new winston.transports.Console(options),
-      ],
-    });
+  init(config, loggerInstance) {
+    if (loggerInstance) {
+      logger = loggerInstance;
+    } else {
+      const options = { ...OPTIONS, ...config };
+
+      logger = new winston.Logger({
+        transports: [
+          new winston.transports.Console(options),
+        ],
+      });
+    }
 
     delete loggerInterface.init;
   },