feat: allow to pretty-print in production (#109)

* feat: allow to pretty-print in production

* chore: changen env name to LOG_FORMAT

Author: anxolin

.env.example

@@ -1,4 +1,5 @@
 # Version: Used in the /about endpoint. Useful to expose the Docker image version.
+# LOG_FORMAT=pretty
 # LOG_LEVEL=info
 # VESION=1.0.0
 

apps/api/src/logger.ts

@@ -2,16 +2,25 @@ import pino from 'pino';
 
 export type Logger = pino.Logger;
 
-const loggerConfigEnv =
-  process.env.NODE_ENV === 'production'
-    ? {}
-    : {
+function getLogger() {
+  // Uses pretty print if env.LOG_FORMAT is set to 'pretty'. By default, it will also use it for non-production environments.
+  // If the env.LOG_FORMAT is not 'pretty', it defaults to a JSON logger.
+  const usePrettyPrint = process.env.LOG_FORMAT
+    ? process.env.LOG_FORMAT === 'pretty'
+    : process.env.NODE_ENV !== 'production';
+
+  const loggerConfigEnv = usePrettyPrint
+    ? {
         transport: {
           target: 'pino-pretty',
         },
-      };
+      }
+    : {};
+
+  return pino({
+    ...loggerConfigEnv,
+    level: process.env.LOG_LEVEL ?? 'info',
+  });
+}
 
-export const logger = pino({
-  ...loggerConfigEnv,
-  level: process.env.LOG_LEVEL ?? 'info',
-});
+export const logger = getLogger();