diff --git a/packages/rrweb-snapshot/src/snapshot.ts b/packages/rrweb-snapshot/src/snapshot.ts
index 9aae55cb..6c6e136e 100644
--- a/packages/rrweb-snapshot/src/snapshot.ts
+++ b/packages/rrweb-snapshot/src/snapshot.ts
@@ -10,10 +10,8 @@ import {
   MaskTextFn,
   MaskInputFn,
   KeepIframeSrcFn,
-  documentNode,
 } from './types';
 import { isElement, isShadowRoot, maskInputValue } from './utils';
-import { values } from 'puppeteer/DeviceDescriptors';
 
 let _id = 1;
 const tagNameRegex = new RegExp('[^a-z0-9-_:]');
@@ -55,7 +53,9 @@ function getCssRuleString(rule: CSSRule): string {
   if (isCSSImportRule(rule)) {
     try {
       cssStringified = getCssRulesString(rule.styleSheet) || cssStringified;
-    } catch {}
+    } catch {
+      // ignore
+    }
   }
   return cssStringified;
 }
@@ -136,8 +136,8 @@ function getAbsoluteSrcsetString(doc: Document, attributeValue: string) {
   let pos = 0;
 
   function collectCharacters(regEx: RegExp) {
-    var chars,
-      match = regEx.exec(attributeValue.substring(pos));
+    let chars: string;
+    let match = regEx.exec(attributeValue.substring(pos));
     if (match) {
       chars = match[0];
       pos += chars.length;