From 48c4f2eb4449e4807914c4c1a3b765dafd12ccba Mon Sep 17 00:00:00 2001
From: Daniel Cohen Gindi <Danielgindi@gmail.com>
Date: Mon, 13 Jul 2020 22:30:02 +0300
Subject: [PATCH] Apply default value also when params is specified

---
 index.js | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/index.js b/index.js
index 4b098591..8e42b110 100644
--- a/index.js
+++ b/index.js
@@ -67,10 +67,17 @@ var supportedEncodingsNoDeflate = hasBrotliSupport
 function compression (options) {
   var opts = options || {}
 
-  if (hasBrotliSupport && opts.params === undefined) {
-    opts = objectAssign({}, opts)
-    opts.params = {}
-    opts.params[zlib.constants.BROTLI_PARAM_QUALITY] = 4
+  if (hasBrotliSupport) {
+    // set the default level to a reasonable value with balanced speed/ratio
+    if (opts.params === undefined) {
+      opts = objectAssign({}, opts)
+      opts.params = {}
+    }
+
+    if (opts.params[zlib.constants.BROTLI_PARAM_QUALITY] === undefined) {
+      opts.params = objectAssign({}, opts.params)
+      opts.params[zlib.constants.BROTLI_PARAM_QUALITY] = 4
+    }
   }
 
   // options