diff --git a/.eslintrc.yaml b/.eslintrc.yaml
index db85b143dd..a4967d170e 100644
--- a/.eslintrc.yaml
+++ b/.eslintrc.yaml
@@ -656,6 +656,7 @@ rules:
   unicorn/catch-error-name: [0]
   unicorn/consistent-destructuring: [2]
   unicorn/consistent-empty-array-spread: [2]
+  unicorn/consistent-existence-index-check: [2]
   unicorn/consistent-function-scoping: [2]
   unicorn/custom-error-definition: [0]
   unicorn/empty-brace-spaces: [2]
@@ -732,10 +733,12 @@ rules:
   unicorn/prefer-dom-node-text-content: [2]
   unicorn/prefer-event-target: [2]
   unicorn/prefer-export-from: [0]
+  unicorn/prefer-global-this: [0]
   unicorn/prefer-includes: [2]
   unicorn/prefer-json-parse-buffer: [0]
   unicorn/prefer-keyboard-event-key: [2]
   unicorn/prefer-logical-operator-over-ternary: [2]
+  unicorn/prefer-math-min-max: [2]
   unicorn/prefer-math-trunc: [2]
   unicorn/prefer-modern-dom-apis: [0]
   unicorn/prefer-modern-math-apis: [2]
diff --git a/web_src/js/features/comp/ComboMarkdownEditor.js b/web_src/js/features/comp/ComboMarkdownEditor.js
index 70e92de0c9..65ca7db882 100644
--- a/web_src/js/features/comp/ComboMarkdownEditor.js
+++ b/web_src/js/features/comp/ComboMarkdownEditor.js
@@ -363,7 +363,7 @@ class ComboMarkdownEditor {
     const lineStart = Math.max(0, value.lastIndexOf('\n', start - 1) + 1);
     // Find the end and extract the line.
     const lineEnd = value.indexOf('\n', start);
-    const line = value.slice(lineStart, lineEnd < 0 ? value.length : lineEnd);
+    const line = value.slice(lineStart, lineEnd === -1 ? value.length : lineEnd);
     // Match any whitespace at the start + any repeatable prefix + exactly one space after.
     const prefix = line.match(/^\s*((\d+)[.)]\s|[-*+]\s+(\[[ x]\]\s?)?|(>\s+)+)?/);
 
diff --git a/web_src/js/features/eventsource.sharedworker.js b/web_src/js/features/eventsource.sharedworker.js
index 62581cf687..15d028ea0c 100644
--- a/web_src/js/features/eventsource.sharedworker.js
+++ b/web_src/js/features/eventsource.sharedworker.js
@@ -28,7 +28,7 @@ class Source {
 
   deregister(port) {
     const portIdx = this.clients.indexOf(port);
-    if (portIdx < 0) {
+    if (portIdx === -1) {
       return this.clients.length;
     }
     this.clients.splice(portIdx, 1);
diff --git a/web_src/js/utils.js b/web_src/js/utils.js
index ce0fb66343..8805b702c8 100644
--- a/web_src/js/utils.js
+++ b/web_src/js/utils.js
@@ -3,13 +3,13 @@ import {encode, decode} from 'uint8-to-base64';
 // transform /path/to/file.ext to file.ext
 export function basename(path = '') {
   const lastSlashIndex = path.lastIndexOf('/');
-  return lastSlashIndex < 0 ? path : path.substring(lastSlashIndex + 1);
+  return lastSlashIndex === -1 ? path : path.substring(lastSlashIndex + 1);
 }
 
 // transform /path/to/file.ext to .ext
 export function extname(path = '') {
   const lastPointIndex = path.lastIndexOf('.');
-  return lastPointIndex < 0 ? '' : path.substring(lastPointIndex);
+  return lastPointIndex === -1 ? '' : path.substring(lastPointIndex);
 }
 
 // test whether a variable is an object
diff --git a/web_src/js/utils/dom.js b/web_src/js/utils/dom.js
index 44adc795c5..54f7335186 100644
--- a/web_src/js/utils/dom.js
+++ b/web_src/js/utils/dom.js
@@ -155,7 +155,7 @@ export function autosize(textarea, {viewportMarginBottom = 0} = {}) {
       const isBorderBox = computedStyle.boxSizing === 'border-box';
       const borderAddOn = isBorderBox ? topBorderWidth + bottomBorderWidth : 0;
 
-      const adjustedViewportMarginBottom = bottom < viewportMarginBottom ? bottom : viewportMarginBottom;
+      const adjustedViewportMarginBottom = Math.min(bottom, viewportMarginBottom);
       const curHeight = parseFloat(computedStyle.height);
       const maxHeight = curHeight + bottom - adjustedViewportMarginBottom;