diff --git a/packages/blockly/eslint.config.mjs b/eslint.config.mjs
similarity index 72%
rename from packages/blockly/eslint.config.mjs
rename to eslint.config.mjs
index 104e1b7d006..abc2a9e8d5f 100644
--- a/packages/blockly/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -1,8 +1,10 @@
 import eslint from '@eslint/js';
 import googleStyle from 'eslint-config-google';
 import jsdoc from 'eslint-plugin-jsdoc';
+import * as mdx from 'eslint-plugin-mdx';
 import mochaPlugin from 'eslint-plugin-mocha';
 import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
+import {defineConfig} from 'eslint/config';
 import globals from 'globals';
 import tseslint from 'typescript-eslint';
 
@@ -133,41 +135,64 @@ function buildTSOverride({files, tsconfig}) {
   };
 }
 
-export default [
+export default defineConfig(
   {
     // Note: there should be no other properties in this object
     ignores: [
       // Build artifacts
-      'msg/*',
-      'build/*',
-      'dist/*',
-      'typings/*',
-      'docs/*',
+      'packages/blockly/msg/*',
+      'packages/blockly/build/*',
+      'packages/blockly/dist/*',
+      'packages/blockly/typings/*',
+      'packages/blockly/docs/*',
       // Tests other than mocha unit tests
-      'tests/blocks/*',
-      'tests/themes/*',
-      'tests/compile/*',
-      'tests/jsunit/*',
-      'tests/generators/*',
-      'tests/mocha/webdriver.js',
-      'tests/screenshot/*',
-      'tests/test_runner.js',
-      'tests/workspace_svg/*',
+      'packages/blockly/tests/blocks/*',
+      'packages/blockly/tests/themes/*',
+      'packages/blockly/tests/compile/*',
+      'packages/blockly/tests/jsunit/*',
+      'packages/blockly/tests/generators/*',
+      'packages/blockly/tests/mocha/webdriver.js',
+      'packages/blockly/tests/screenshot/*',
+      'packages/blockly/tests/test_runner.js',
+      'packages/blockly/tests/workspace_svg/*',
       // Demos, scripts, misc
-      'node_modules/*',
-      'generators/*',
-      'demos/*',
-      'appengine/*',
-      'externs/*',
-      'closure/*',
-      'scripts/gulpfiles/*',
-      'CHANGELOG.md',
-      'PULL_REQUEST_TEMPLATE.md',
+      'packages/blockly/node_modules/*',
+      'packages/blockly/generators/*',
+      'packages/blockly/demos/*',
+      'packages/blockly/appengine/*',
+      'packages/blockly/externs/*',
+      'packages/blockly/closure/*',
+      'packages/blockly/scripts/gulpfiles/*',
+      'packages/blockly/CHANGELOG.md',
+      'packages/blockly/PULL_REQUEST_TEMPLATE.md',
+      // Docs
+      'packages/docs/docs/reference/**',
+      'packages/docs/build/**',
+      'packages/docs/.docusaurus/**',
+      'packages/docs/node_modules/**',
     ],
   },
-  eslint.configs.recommended,
   jsdoc.configs['flat/recommended'],
-  googleStyle,
+  {
+    files: ['packages/blockly/**/*.ts', 'packages/blockly/**/*.tsx', 'packages/blockly/**/*.js'],
+    extends: [eslint.configs.recommended, googleStyle],
+    languageOptions: {
+      ecmaVersion: 2020,
+      sourceType: 'module',
+    },
+    settings: {
+      // Allowlist some JSDoc tag aliases we use.
+      'jsdoc': {
+        'tagNamePreference': {
+          'return': 'return',
+          'fileoverview': 'fileoverview',
+          'extends': 'extends',
+          'constructor': 'constructor',
+        },
+      },
+    },
+    rules,
+  },
   {
     languageOptions: {
       ecmaVersion: 2020,
@@ -188,14 +213,14 @@ export default [
   },
   {
     files: [
-      'eslint.config.mjs',
-      '.prettierrc.js',
-      'gulpfile.mjs',
-      'scripts/helpers.js',
-      'tests/mocha/.mocharc.js',
-      'tests/migration/validate-renamings.mjs',
-      'tests/scripts/magic_symlink.js',
-      'tests/scripts/webdriver_helpers.js',
+      'packages/blockly/eslint.config.mjs',
+      'packages/blockly/.prettierrc.js',
+      'packages/blockly/gulpfile.mjs',
+      'packages/blockly/scripts/helpers.js',
+      'packages/blockly/tests/mocha/.mocharc.js',
+      'packages/blockly/tests/migration/validate-renamings.mjs',
+      'packages/blockly/tests/scripts/magic_symlink.js',
+      'packages/blockly/tests/scripts/webdriver_helpers.js',
     ],
     languageOptions: {
       globals: {
@@ -207,7 +232,7 @@ export default [
     },
   },
   {
-    files: ['tests/**'],
+    files: ['packages/blockly/tests/**'],
     plugins: {
       mocha: mochaPlugin,
     },
@@ -237,7 +262,7 @@ export default [
     },
   },
   {
-    files: ['tests/browser/**'],
+    files: ['packages/blockly/tests/browser/**'],
     languageOptions: {
       sourceType: 'module',
       globals: {
@@ -257,7 +282,7 @@ export default [
     },
   },
   {
-    files: ['tests/mocha/**'],
+    files: ['packages/blockly/tests/mocha/**'],
     languageOptions: {
       sourceType: 'module',
       globals: {
@@ -276,7 +301,7 @@ export default [
     },
   },
   {
-    files: ['tests/node/**'],
+    files: ['packages/blockly/tests/node/**'],
     languageOptions: {
       globals: {
         'console': true,
@@ -287,7 +312,7 @@ export default [
     },
   },
   {
-    files: ['tests/playgrounds/**', 'tests/scripts/**'],
+    files: ['packages/blockly/tests/playgrounds/**', 'packages/blockly/tests/scripts/**'],
     languageOptions: {
       globals: {
         ...globals.browser,
@@ -295,7 +320,7 @@ export default [
     },
   },
   {
-    files: ['scripts/**'],
+    files: ['packages/blockly/scripts/**'],
     languageOptions: {
       globals: {
         ...globals.browser,
@@ -307,17 +332,35 @@ export default [
       'jsdoc/tag-lines': ['off'],
     },
   },
+  {
+    ...mdx.flat,
+    files: ['packages/docs/**/*.mdx'],
+    rules: {
+      ...mdx.flat.rules,
+      'mdx/remark': 'off',
+    },
+  },
+  {
+    ...mdx.flat,
+    files: ['packages/docs/**/*.md'],
+    ...mdx.flatCodeBlocks,
+    rules: {
+      ...mdx.flat.rules,
+      ...mdx.flatCodeBlocks.rules,
+      'mdx/remark': 'off',
+    },
+  },
   ...tseslint.config(
     buildTSOverride({
-      files: ['**/*.ts', '**/*.tsx'],
+      files: ['packages/blockly/**/*.ts', 'packages/blockly/**/*.tsx'],
       tsconfig: './tsconfig.json',
     }),
     buildTSOverride({
-      files: ['tests/typescript/**/*.ts', 'tests/typescript/**/*.tsx'],
+      files: ['packages/blockly/tests/typescript/**/*.ts', 'packages/blockly/tests/typescript/**/*.tsx'],
       tsconfig: './tests/typescript/tsconfig.json',
     }),
   ),
   // Per the docs, this should be at the end because it disables rules that
   // conflict with Prettier.
   eslintPluginPrettierRecommended,
-];
+);
diff --git a/package-lock.json b/package-lock.json
index da287c8c57a..1120dfbb2df 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,15 @@
       ],
       "devDependencies": {
         "@commitlint/cli": "^21.2.0",
-        "@commitlint/config-conventional": "^21.0.2"
+        "@commitlint/config-conventional": "^21.0.2",
+        "@eslint/js": "^10.0.1",
+        "eslint": "10.5.0",
+        "eslint-config-google": "^0.14.0",
+        "eslint-config-prettier": "^10.1.8",
+        "eslint-plugin-jsdoc": "^63.0.11",
+        "eslint-plugin-mdx": "^3.7.0",
+        "eslint-plugin-mocha": "^11.3.0",
+        "eslint-plugin-prettier": "^5.5.5"
       }
     },
     "node_modules/@algolia/abtesting": {
@@ -6779,6 +6787,27 @@
         "node": "^20.19.0 || ^22.13.0 || >=24"
       }
     },
+    "node_modules/@eslint/js": {
+      "version": "10.0.1",
+      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-10.0.1.tgz",
+      "integrity": "sha512-zeR9k5pd4gxjZ0abRoIaxdc7I3nDktoXZk2qOv9gCNWx3mVwEn32VRhyLaRsDiJjTs0xq/T8mfPtyuXu7GWBcA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=24"
+      },
+      "funding": {
+        "url": "https://eslint.org/donate"
+      },
+      "peerDependencies": {
+        "eslint": "^10.0.0"
+      },
+      "peerDependenciesMeta": {
+        "eslint": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@eslint/object-schema": {
       "version": "3.0.5",
       "dev": true,
@@ -14527,6 +14556,37 @@
         }
       }
     },
+    "node_modules/eslint-mdx/node_modules/eslint-visitor-keys": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-4.2.1.tgz",
+      "integrity": "sha512-Uhdk5sfqcee/9H/rCOJikYz67o0a2Tw2hGRPOG2Y1R2dg7brRe1uG0yaNQDHu+TO/uQPF/5eCapvYSmHUjt7JQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
+    "node_modules/eslint-mdx/node_modules/espree": {
+      "version": "10.4.0",
+      "resolved": "https://registry.npmjs.org/espree/-/espree-10.4.0.tgz",
+      "integrity": "sha512-j6PAQ2uUr79PZhBjP5C5fhl8e39FmRnOjsD5lGnWrFU8i2G776tBK7+nP8KuQUTTyAZUwfQqXAgrVH5MbH9CYQ==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "acorn": "^8.15.0",
+        "acorn-jsx": "^5.3.2",
+        "eslint-visitor-keys": "^4.2.1"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
     "node_modules/eslint-plugin-jsdoc": {
       "version": "63.0.11",
       "resolved": "https://registry.npmjs.org/eslint-plugin-jsdoc/-/eslint-plugin-jsdoc-63.0.11.tgz",
@@ -29277,7 +29337,6 @@
         "@blockly/block-test": "^7.0.6",
         "@blockly/dev-tools": "^9.0.9",
         "@blockly/theme-modern": "^7.0.5",
-        "@eslint/js": "^10.0.1",
         "@hyperjump/browser": "^1.3.1",
         "@hyperjump/json-schema": "^1.17.6",
         "@microsoft/api-documenter": "7.30.7",
@@ -29288,12 +29347,6 @@
         "concurrently": "^10.0.3",
         "conventional-changelog-conventionalcommits": "^9.3.1",
         "conventional-recommended-bump": "^12.0.0",
-        "eslint": "10.5.0",
-        "eslint-config-google": "^0.14.0",
-        "eslint-config-prettier": "^10.1.8",
-        "eslint-plugin-jsdoc": "^63.0.11",
-        "eslint-plugin-mocha": "^11.3.0",
-        "eslint-plugin-prettier": "^5.5.5",
         "glob": "^13.0.6",
         "globals": "^17.7.0",
         "google-closure-compiler": "^20260520.0.0",
@@ -29328,25 +29381,6 @@
         "jsdom": "^27.4.0"
       }
     },
-    "packages/blockly/node_modules/@eslint/js": {
-      "version": "10.0.1",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": "^20.19.0 || ^22.13.0 || >=24"
-      },
-      "funding": {
-        "url": "https://eslint.org/donate"
-      },
-      "peerDependencies": {
-        "eslint": "^10.0.0"
-      },
-      "peerDependenciesMeta": {
-        "eslint": {
-          "optional": true
-        }
-      }
-    },
     "packages/blockly/node_modules/chalk": {
       "version": "5.6.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-5.6.2.tgz",
@@ -29428,8 +29462,6 @@
         "@docusaurus/faster": "^3.10.1",
         "@docusaurus/module-type-aliases": "^3.10.1",
         "@docusaurus/types": "^3.10.1",
-        "eslint": "10.5.0",
-        "eslint-plugin-mdx": "^3.7.0",
         "prettier": "3.8.4"
       },
       "engines": {
diff --git a/package.json b/package.json
index 0b4f452c24b..2cdab694393 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,15 @@
   ],
   "devDependencies": {
     "@commitlint/cli": "^21.2.0",
-    "@commitlint/config-conventional": "^21.0.2"
+    "@commitlint/config-conventional": "^21.0.2",
+    "@eslint/js": "^10.0.1",
+    "eslint": "10.5.0",
+    "eslint-config-google": "^0.14.0",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-jsdoc": "^63.0.11",
+    "eslint-plugin-mdx": "^3.7.0",
+    "eslint-plugin-mocha": "^11.3.0",
+    "eslint-plugin-prettier": "^5.5.5"
   },
   "scripts": {
     "test": "npm run test --ws --if-present",
diff --git a/packages/blockly/package.json b/packages/blockly/package.json
index d33b4461cc7..2ea7d2f99b1 100644
--- a/packages/blockly/package.json
+++ b/packages/blockly/package.json
@@ -104,7 +104,6 @@
     "@blockly/block-test": "^7.0.6",
     "@blockly/dev-tools": "^9.0.9",
     "@blockly/theme-modern": "^7.0.5",
-    "@eslint/js": "^10.0.1",
     "@hyperjump/browser": "^1.3.1",
     "@hyperjump/json-schema": "^1.17.6",
     "@microsoft/api-documenter": "7.30.7",
@@ -115,12 +114,6 @@
     "concurrently": "^10.0.3",
     "conventional-changelog-conventionalcommits": "^9.3.1",
     "conventional-recommended-bump": "^12.0.0",
-    "eslint": "10.5.0",
-    "eslint-config-google": "^0.14.0",
-    "eslint-config-prettier": "^10.1.8",
-    "eslint-plugin-jsdoc": "^63.0.11",
-    "eslint-plugin-mocha": "^11.3.0",
-    "eslint-plugin-prettier": "^5.5.5",
     "glob": "^13.0.6",
     "globals": "^17.7.0",
     "google-closure-compiler": "^20260520.0.0",
diff --git a/packages/docs/eslint.config.mjs b/packages/docs/eslint.config.mjs
deleted file mode 100644
index 33fee652aac..00000000000
--- a/packages/docs/eslint.config.mjs
+++ /dev/null
@@ -1,30 +0,0 @@
-import * as mdx from 'eslint-plugin-mdx';
-
-export default [
-  {
-    ...mdx.flat,
-    files: ['**/*.mdx'],
-    rules: {
-      ...mdx.flat.rules,
-      'mdx/remark': 'off',
-    },
-  },
-  {
-    ...mdx.flat,
-    files: ['**/*.md'],
-    ...mdx.flatCodeBlocks,
-    rules: {
-      ...mdx.flat.rules,
-      ...mdx.flatCodeBlocks.rules,
-      'mdx/remark': 'off',
-    },
-  },
-  {
-    ignores: [
-      'docs/reference/**',
-      'build/**',
-      '.docusaurus/**',
-      'node_modules/**',
-    ],
-  },
-];
diff --git a/packages/docs/package.json b/packages/docs/package.json
index 2fa9d9d3673..5b9de74f46b 100644
--- a/packages/docs/package.json
+++ b/packages/docs/package.json
@@ -35,8 +35,6 @@
     "@docusaurus/faster": "^3.10.1",
     "@docusaurus/module-type-aliases": "^3.10.1",
     "@docusaurus/types": "^3.10.1",
-    "eslint": "10.5.0",
-    "eslint-plugin-mdx": "^3.7.0",
     "prettier": "3.8.4"
   },
   "browserslist": {