diff --git a/package-lock.json b/package-lock.json
index 80229eb..69b1f3b 100644
--- a/package-lock.json
+++ b/package-lock.json
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+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.1.tgz",
+          "integrity": "sha512-qQKT4zQxXl8lLwBtHMWwaTcGfFOZviOJet3Oy/xmGk2gZH677CJM9EvtfdSkgWcATZhj/55JZ0rmy3myCT5lsA==",
           "dev": true,
           "requires": {
             "argparse": "^2.0.1"
diff --git a/package.json b/package.json
index 5e029f8..dc3bbb0 100644
--- a/package.json
+++ b/package.json
@@ -67,6 +67,7 @@
       "comma-dangle": 0,
       "capitalized-comments": 0,
       "dot-notation": 0,
+      "guard-for-in": 0,
       "import/extensions": 0,
       "import/no-dynamic-require": 0,
       "new-cap": 0,
diff --git a/parse.ts b/parse.ts
index 0da3b2f..332b7ee 100644
--- a/parse.ts
+++ b/parse.ts
@@ -480,9 +480,7 @@ function parseMasterPlaylist(lines: Line[], params: Record<string, any>): Master
       }
       playlist.start = {offset: attributes['TIME-OFFSET'], precise: attributes['PRECISE'] || false};
     } else if (name === 'EXT-X-DEFINE') {
-      if (!playlist.defines) {
-        playlist.defines = [];
-      }
+      playlist.defines ||= [];
       playlist.defines.push(attributes);
     }
   }
@@ -783,9 +781,7 @@ function parseMediaPlaylist(lines: Line[], params: Record<string, any>): MediaPl
       prefetchFound = true;
       segmentStart = -1;
     } else if (name === 'EXT-X-DEFINE') {
-      if (!playlist.defines) {
-        playlist.defines = [];
-      }
+      playlist.defines ||= [];
       playlist.defines.push(attributes);
     } else if (typeof line === 'string') {
       // uri
diff --git a/stringify.ts b/stringify.ts
index e44396d..d7898ff 100644
--- a/stringify.ts
+++ b/stringify.ts
@@ -492,13 +492,12 @@ function buildParts(lines: LineArray, parts: PartialSegment[]) {
 
 function buildDefines(define: Record<string, string>) {
   const attrs: string[] = [];
-  for (var attr in define) {
+  for (const attr in define) {
     attrs.push(`${attr}="${define[attr]}"`);
   }
   return `#EXT-X-DEFINE:${attrs.join(',')}`;
 }
 
-
 function stringify(playlist: MasterPlaylist | MediaPlaylist, postProcess?: PostProcess): string {
   utils.PARAMCHECK(playlist);
   utils.ASSERT('Not a playlist', playlist.type === 'playlist');