From 3e8870699de32e2c4073b2b11ca3dc636002412d Mon Sep 17 00:00:00 2001
From: Paavo Bennett <paavobennettis@gmail.com>
Date: Mon, 4 Nov 2024 17:52:41 -0600
Subject: [PATCH] fix: unescape \\ for levelKey

closes #456
---
 lib/pretty.js      | 12 +++++++-----
 test/basic.test.js | 16 ++++++++++++++++
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/lib/pretty.js b/lib/pretty.js
index 5284d7bc..a2b6813e 100644
--- a/lib/pretty.js
+++ b/lib/pretty.js
@@ -147,11 +147,13 @@ function pretty (inputData) {
       this.messageKey,
       this.levelKey,
       this.timestampKey
-    ].filter(key => {
-      return typeof log[key] === 'string' ||
-        typeof log[key] === 'number' ||
-        typeof log[key] === 'boolean'
-    })
+    ]
+      .map((key) => key.replaceAll(/\\/g, ''))
+      .filter(key => {
+        return typeof log[key] === 'string' ||
+          typeof log[key] === 'number' ||
+          typeof log[key] === 'boolean'
+      })
     const prettifiedObject = prettifyObject({
       log,
       skipKeys,
diff --git a/test/basic.test.js b/test/basic.test.js
index a62abbf3..3437d1e4 100644
--- a/test/basic.test.js
+++ b/test/basic.test.js
@@ -218,6 +218,22 @@ test('basic prettifier tests', (t) => {
     log.info({ msg: 'foo', bar: 'warn' })
   })
 
+  t.test('can use nested level keys', (t) => {
+    t.plan(1)
+    const pretty = prettyFactory({ levelKey: 'log\\.level' })
+    const log = pino({}, new Writable({
+      write (chunk, enc, cb) {
+        const formatted = pretty(chunk.toString())
+        t.equal(
+          formatted,
+          `[${formattedEpoch}] WARN (${pid}): foo\n`
+        )
+        cb()
+      }
+    }))
+    log.info({ msg: 'foo', 'log.level': 'warn' })
+  })
+
   t.test('can use a customPrettifier on default level output', (t) => {
     t.plan(1)
     const veryCustomLevels = {