diff --git a/docs/.eslintrc.js b/docs/.eslintrc.js
deleted file mode 100644
index 1ec3b7eae..000000000
--- a/docs/.eslintrc.js
+++ /dev/null
@@ -1,7 +0,0 @@
-'use strict'
-
-module.exports = {
-  parserOptions: {
-    sourceType: 'module'
-  }
-}
diff --git a/docs/.vitepress/config.mts b/docs/.vitepress/config.mts
index 7d198d588..20ac9bff5 100644
--- a/docs/.vitepress/config.mts
+++ b/docs/.vitepress/config.mts
@@ -10,6 +10,7 @@ import './build-system/build.mjs'
 
 const dirname = path.dirname(fileURLToPath(import.meta.url))
 
+// eslint-disable-next-line unicorn/no-anonymous-default-export
 export default async () => {
   const rulesPath = '../../tools/lib/rules.js' // Avoid bundle
   const rules: typeof import('../../tools/lib/rules.js') = await import(
@@ -87,12 +88,10 @@ export default async () => {
         )
         return !exists
       })
-      .map(({ ruleId, name }) => {
-        return {
-          text: ruleId,
-          link: `/rules/${name}`
-        }
-      })
+      .map(({ ruleId, name }) => ({
+        text: ruleId,
+        link: `/rules/${name}`
+      }))
 
     if (children.length === 0) {
       continue
diff --git a/docs/.vitepress/theme/index.ts b/docs/.vitepress/theme/index.ts
index 757e63cab..34f6ee9b0 100644
--- a/docs/.vitepress/theme/index.ts
+++ b/docs/.vitepress/theme/index.ts
@@ -1,12 +1,10 @@
 // @ts-expect-error -- Browser
-if (typeof window !== 'undefined') {
-  if (typeof require === 'undefined') {
-    // @ts-expect-error -- Browser
-    ;(window as any).require = () => {
-      const e = new Error('require is not defined')
-      ;(e as any).code = 'MODULE_NOT_FOUND'
-      throw e
-    }
+if (typeof window !== 'undefined' && typeof require === 'undefined') {
+  // @ts-expect-error -- Browser
+  ;(window as any).require = () => {
+    const e = new Error('require is not defined')
+    ;(e as any).code = 'MODULE_NOT_FOUND'
+    throw e
   }
 }
 // @ts-expect-error -- Cannot change `module` option
diff --git a/docs/.vitepress/vite-plugin.mts b/docs/.vitepress/vite-plugin.mts
index cd6811cb6..bd9c9090b 100644
--- a/docs/.vitepress/vite-plugin.mts
+++ b/docs/.vitepress/vite-plugin.mts
@@ -11,7 +11,7 @@ const libRoot = path.join(fileURLToPath(import.meta.url), '../../../lib')
 export function vitePluginRequireResolve(): Plugin {
   return {
     name: 'vite-plugin-require.resolve',
-    transform(code, id, _options) {
+    transform(code, id) {
       if (id.startsWith(libRoot)) {
         return code.replace(/require\.resolve/gu, '(function(){return 0})')
       }
@@ -34,8 +34,9 @@ export function viteCommonjs(): Plugin {
           format: 'esm'
         })
         return transformed.code
-      } catch (e) {
-        console.error('Transform error. base code:\n' + base, e)
+      } catch (error) {
+        // eslint-disable-next-line no-console
+        console.error(`Transform error. base code:\n${base}`, error)
       }
       return undefined
     }
@@ -58,24 +59,26 @@ function transformRequire(code: string) {
       }
 
       let id =
+        // eslint-disable-next-line prefer-template
         '__' +
         moduleString.replace(/[^a-zA-Z0-9_$]+/gu, '_') +
-        Math.random().toString(32).substring(2)
+        Math.random().toString(32).slice(2)
       while (code.includes(id) || modules.has(id)) {
-        id += Math.random().toString(32).substring(2)
+        id += Math.random().toString(32).slice(2)
       }
       modules.set(id, moduleString)
-      return id + '()'
+      return `${id}()`
     }
   )
 
   return (
+    // eslint-disable-next-line prefer-template
     [...modules]
-      .map(([id, moduleString]) => {
-        return `import * as __temp_${id} from ${moduleString};
+      .map(
+        ([id, moduleString]) => `import * as __temp_${id} from ${moduleString};
 const ${id} = () => __temp_${id}.default || __temp_${id};
 `
-      })
+      )
       .join('') +
     ';\n' +
     replaced
diff --git a/eslint.config.mjs b/eslint.config.mjs
index 0fe41f792..044005f23 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -7,6 +7,8 @@ import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended'
 import eslintPluginUnicorn from 'eslint-plugin-unicorn'
 import eslintMarkdown from '@eslint/markdown'
 import eslintPluginMarkdownPreferences from 'eslint-plugin-markdown-preferences'
+import eslintPluginTs from '@typescript-eslint/eslint-plugin'
+import tsEslintParser from '@typescript-eslint/parser'
 import vueEslintParser from 'vue-eslint-parser'
 import noInvalidMeta from './eslint-internal-rules/no-invalid-meta.js'
 import noInvalidMetaDocsCategories from './eslint-internal-rules/no-invalid-meta-docs-categories.js'
@@ -50,6 +52,7 @@ export default typegen([
   {
     ignores: [
       '.nyc_output',
+      'eslint-typegen.d.ts',
       'coverage',
       'node_modules',
       '.changeset/**/*.md',
@@ -78,7 +81,7 @@ export default typegen([
     }
   },
   ...defineConfig({
-    files: ['**/*.js'],
+    files: ['**/*.{js,mjs,ts,mts}'],
     extends: [
       eslintPluginEslintPlugin,
       eslintPluginUnicorn.configs['flat/recommended']
@@ -105,7 +108,21 @@ export default typegen([
   }),
 
   {
-    files: ['**/*.js'],
+    name: 'typescript/setup',
+    files: ['**/*.{ts,mts}'],
+    languageOptions: {
+      parser: tsEslintParser,
+      parserOptions: {
+        sourceType: 'module'
+      }
+    },
+    plugins: {
+      '@typescript-eslint': eslintPluginTs
+    }
+  },
+
+  {
+    files: ['**/*.{js,mjs,ts,mts}'],
     languageOptions: {
       ecmaVersion: 'latest',
       sourceType: 'commonjs',
@@ -249,6 +266,35 @@ export default typegen([
       'internal/require-eslint-community': ['error']
     }
   },
+
+  {
+    files: ['**/*.{mjs,ts,mts}'],
+    languageOptions: {
+      sourceType: 'module'
+    }
+  },
+
+  {
+    files: ['**/*.{ts,mts}'],
+    rules: {
+      ...eslintPluginTs.configs.strict.rules,
+      ...eslintPluginTs.configs['flat/eslint-recommended'].rules,
+      'no-redeclare': 'off',
+      '@typescript-eslint/no-redeclare': 'error',
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-empty-object-type': 'off',
+      '@typescript-eslint/no-namespace': 'off',
+      '@typescript-eslint/triple-slash-reference': 'off',
+      '@typescript-eslint/unified-signatures': 'off',
+      '@typescript-eslint/ban-ts-comment': [
+        'error',
+        {
+          minimumDescriptionLength: 3
+        }
+      ]
+    }
+  },
+
   {
     files: ['./**/*.vue'],
     languageOptions: {
diff --git a/package.json b/package.json
index 78a103cdf..4eccdd8e9 100644
--- a/package.json
+++ b/package.json
@@ -90,6 +90,7 @@
     "@types/node": "^24.0.8",
     "@types/semver": "^7.5.8",
     "@types/xml-name-validator": "^4.0.3",
+    "@typescript-eslint/eslint-plugin": "^8.35.1",
     "@typescript-eslint/parser": "^8.35.1",
     "@typescript-eslint/types": "^8.35.1",
     "@vitest/coverage-v8": "^3.2.4",
diff --git a/typings/eslint-plugin-vue/util-types/ast/es-ast.ts b/typings/eslint-plugin-vue/util-types/ast/es-ast.ts
index 3205dc74e..4297d3d56 100644
--- a/typings/eslint-plugin-vue/util-types/ast/es-ast.ts
+++ b/typings/eslint-plugin-vue/util-types/ast/es-ast.ts
@@ -351,7 +351,7 @@ export interface PrivateIdentifier extends HasParentNode {
 }
 export interface Literal extends HasParentNode {
   type: 'Literal'
-  value: string | boolean | null | number | RegExp | BigInt
+  value: string | boolean | null | number | RegExp | bigint
   raw: string
   regex?: {
     pattern: string
diff --git a/vitest.config.mts b/vitest.config.mts
index eeef751d6..be1e63448 100644
--- a/vitest.config.mts
+++ b/vitest.config.mts
@@ -1,11 +1,8 @@
+import { defineConfig } from 'vitest/config'
 
-import { defineConfig } from 'vitest/config';
 export default defineConfig({
   test: {
-    include: [
-      'tests/lib/**/*.js',
-      'tests/integrations/**/*.js'
-    ],
+    include: ['tests/lib/**/*.js', 'tests/integrations/**/*.js'],
     exclude: [
       '**/node_modules/**',
       '**/dist/**',
@@ -18,15 +15,10 @@ export default defineConfig({
     coverage: {
       provider: 'v8',
       include: ['lib/**/*.js'],
-      exclude: [
-        'tests/**',
-        'dist/**',
-        'tools/**',
-        'node_modules/**'
-      ],
+      exclude: ['tests/**', 'dist/**', 'tools/**', 'node_modules/**'],
       reporter: ['text', 'lcov', 'json-summary', 'html'],
       all: true,
       reportsDirectory: './coverage'
-    },
-  },
-});
+    }
+  }
+})