diff --git a/bin/dev.ts b/bin/dev.ts
index 47ce89b7..a54dd55d 100644
--- a/bin/dev.ts
+++ b/bin/dev.ts
@@ -8,7 +8,7 @@ import chalk from "chalk";
 import { copyToClipboardPlugin } from "../copyToClipboardRollupPlugin.js";
 import { userscriptMetaPlugin } from "../src/userscripts/meta/rollupPlugin.js";
 
-(async () => {
+(() => {
   const watchedFiles: Set<string> = new Set([]);
 
   const chokidarWatcher = chokidar
@@ -47,7 +47,7 @@ import { userscriptMetaPlugin } from "../src/userscripts/meta/rollupPlugin.js";
             console.error(event.error);
           }
 
-          if (event && "result" in event && event.result) {
+          if ("result" in event && event.result) {
             event.result.close();
           }
         });
diff --git a/bin/docgen.ts b/bin/docgen.ts
index 6f717f30..8e073f0f 100644
--- a/bin/docgen.ts
+++ b/bin/docgen.ts
@@ -18,10 +18,10 @@ type FileProperties = {
 
 type FileKind = "script" | "style";
 
-const getFiles = async (): Promise<{
+const getFiles = (): {
   scripts: string[];
   styles: string[];
-}> => {
+} => {
   try {
     return {
       scripts: pipe(
@@ -111,7 +111,7 @@ const getFilesProperties = async ({
   return pipe(
     await Promise.all(
       files.map(async (file) => {
-        return await parseFileComment({ filepath: file, kind });
+        return parseFileComment({ filepath: file, kind });
       }),
     ),
     A.compact,
@@ -152,7 +152,7 @@ const updateReadme = async (scriptsMarkdown: string): Promise<void> => {
 
 //
 (async () => {
-  const { scripts, styles } = await getFiles();
+  const { scripts, styles } = getFiles();
 
   const scriptFileProperties = await getFilesProperties({
     files: scripts,
diff --git a/eslint.config.js b/eslint.config.js
index a78aeace..b2f2783c 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -49,6 +49,7 @@ const config = [
       "@typescript-eslint/naming-convention": "off",
       "consistent-return": "off",
       "id-length": "off",
+      "import/extensions": "off",
       "no-alert": "off",
       "no-console": "off",
       "no-nested-ternary": "off",
diff --git a/src/userscripts/copy-lyrics.user.ts b/src/userscripts/copy-lyrics.user.ts
index 29ca8701..274236dd 100644
--- a/src/userscripts/copy-lyrics.user.ts
+++ b/src/userscripts/copy-lyrics.user.ts
@@ -56,9 +56,10 @@ const lineMusic = () => {
 };
 
 //
-(async () => {
+(() => {
   const url = window.location.href;
 
+  // eslint-disable-next-line @typescript-eslint/no-misused-promises
   document.addEventListener("keydown", async (e) => {
     if (e.ctrlKey && e.key === "Enter") {
       if (url.startsWith("https://www.google.com/search")) {
diff --git a/src/userscripts/slack-no-autofocus.user.ts b/src/userscripts/slack-no-autofocus.user.ts
index 16d1836b..93039adf 100644
--- a/src/userscripts/slack-no-autofocus.user.ts
+++ b/src/userscripts/slack-no-autofocus.user.ts
@@ -1,4 +1,4 @@
-void (async () => {
+void (() => {
   let curTitle = "";
 
   new MutationObserver(() => {
diff --git a/src/userscripts/tweetdeck-shortcuts.user.ts b/src/userscripts/tweetdeck-shortcuts.user.ts
index e70a5eb8..e42de87e 100644
--- a/src/userscripts/tweetdeck-shortcuts.user.ts
+++ b/src/userscripts/tweetdeck-shortcuts.user.ts
@@ -14,9 +14,12 @@ const config = {};
     }
 
     if (
-      e.key === "l" || // default Like
-      e.key === "u" || // default Mute
-      e.key === "x" // default Block
+      // default Like
+      e.key === "l" ||
+      // default Mute
+      e.key === "u" ||
+      // default Block
+      e.key === "x"
     ) {
       e.stopImmediatePropagation();
     }
@@ -42,7 +45,8 @@ const config = {};
     if (e.key === "f") {
       document.dispatchEvent(
         new KeyboardEvent("keypress", {
-          keyCode: 76, // `l`
+          // `l`
+          keyCode: 76,
         }),
       );
     }
diff --git a/src/userscripts/twitter-shortcuts.user.ts b/src/userscripts/twitter-shortcuts.user.ts
index 2dd0d772..ecb8947d 100644
--- a/src/userscripts/twitter-shortcuts.user.ts
+++ b/src/userscripts/twitter-shortcuts.user.ts
@@ -30,8 +30,10 @@ const findTweetInCenter = () => {
     if (isTyping()) return;
 
     if (
-      e.key === "u" || // default Mute
-      e.key === "x" // default Block
+      // default Mute
+      e.key === "u" ||
+      // default Block
+      e.key === "x"
     ) {
       e.stopImmediatePropagation();
     }
diff --git a/src/userscripts/utils/enableSelection.ts b/src/userscripts/utils/enableSelection.ts
index b304d9b6..88227066 100644
--- a/src/userscripts/utils/enableSelection.ts
+++ b/src/userscripts/utils/enableSelection.ts
@@ -2,6 +2,7 @@ export const enableSelection = () => {
   const a = document.body;
   const b = a.parentNode;
   if (b) {
-    b.removeChild(a), b.appendChild(a.cloneNode(!0));
+    b.removeChild(a);
+    b.appendChild(a.cloneNode(!0));
   }
 };
diff --git a/tsconfig.json b/tsconfig.json
index 7095b4b6..560f74f0 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -5,9 +5,10 @@
     "module": "es2020",
     "moduleResolution": "node",
     "noEmit": true,
+    "strict": true,
     "esModuleInterop": true,
     "forceConsistentCasingInFileNames": true,
-    "strict": true,
+    "noUncheckedIndexedAccess": true,
     "skipLibCheck": true,
     "types": ["vitest/globals"]
   }