diff --git a/.eslintignore b/.eslintignore
index ab69469269..4f63374256 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -25,6 +25,7 @@ packages/babel-standalone/babel.js
 packages/babel-standalone/babel.min.js
 packages/babel-parser/test/expressions
 
+eslint/*/lib
 eslint/*/node_modules
 eslint/*/test
 eslint/*/tests
diff --git a/.eslintrc.js b/.eslintrc.js
index df340d2700..b1ca90ef1f 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -12,7 +12,11 @@ module.exports = {
   },
   overrides: [
     {
-      files: ["packages/*/src/**/*.js", "codemods/*/src/**/*.js"],
+      files: [
+        "packages/*/src/**/*.js",
+        "codemods/*/src/**/*.js",
+        "eslint/*/src/**/*.js",
+      ],
       rules: {
         "@babel/development/no-undefined-identifier": "error",
         "@babel/development/no-deprecated-clone": "error",
@@ -24,6 +28,7 @@ module.exports = {
       files: [
         "packages/*/test/**/*.js",
         "codemods/*/test/**/*.js",
+        "eslint/*/test/**/*.js",
         "packages/babel-helper-transform-fixture-test-runner/src/helpers.js",
         "test/**/*.js",
       ],
diff --git a/.prettierrc b/.prettierrc
index 5c53b22f8a..bfe4721c34 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -13,10 +13,12 @@
       "**/codemods/*/src/**/*.js",
       "**/codemods/*/test/**/*.js",
       "**/packages/*/src/**/*.js",
-      "**/packages/*/test/**/*.js"
+      "**/packages/*/test/**/*.js",
+      "**/eslint/*/src/**/*.js",
+      "**/eslint/*/test/**/*.js"
     ],
-    "parser": "babylon",
     "options": {
+      "parser": "babel",
       "trailingComma": "all"
     }
   }]
diff --git a/eslint/babel-eslint-parser/.eslintignore b/eslint/babel-eslint-parser/.eslintignore
deleted file mode 100644
index b18b9022cf..0000000000
--- a/eslint/babel-eslint-parser/.eslintignore
+++ /dev/null
@@ -1,2 +0,0 @@
-!.*.js
-test/fixtures
diff --git a/eslint/babel-eslint-parser/.eslintrc.js b/eslint/babel-eslint-parser/.eslintrc.js
deleted file mode 100644
index a8781be629..0000000000
--- a/eslint/babel-eslint-parser/.eslintrc.js
+++ /dev/null
@@ -1,26 +0,0 @@
-"use strict";
-
-module.exports = {
-  root: true,
-  extends: "babel",
-  plugins: ["prettier"],
-  rules: {
-    "max-len": "off",
-    strict: "error",
-    "prettier/prettier": "error",
-  },
-  env: {
-    node: true,
-  },
-  parserOptions: {
-    sourceType: "script",
-  },
-  overrides: [
-    {
-      files: ["test/**/*"],
-      env: {
-        mocha: true,
-      },
-    },
-  ],
-};
diff --git a/eslint/babel-eslint-parser/src/analyze-scope.js b/eslint/babel-eslint-parser/src/analyze-scope.js
index 38561521d3..a388a45366 100644
--- a/eslint/babel-eslint-parser/src/analyze-scope.js
+++ b/eslint/babel-eslint-parser/src/analyze-scope.js
@@ -94,7 +94,7 @@ class Referencer extends OriginalReferencer {
     // Flow super types.
     this._visitTypeAnnotation(node.implements);
     this._visitTypeAnnotation(
-      node.superTypeParameters && node.superTypeParameters.params
+      node.superTypeParameters && node.superTypeParameters.params,
     );
 
     // Basic.
@@ -205,7 +205,7 @@ class Referencer extends OriginalReferencer {
   _createScopeVariable(node, name) {
     this.currentScope().variableScope.__define(
       name,
-      new Definition("Variable", name, node, null, null, null)
+      new Definition("Variable", name, node, null, null, null),
     );
   }
 
@@ -220,7 +220,7 @@ class Referencer extends OriginalReferencer {
       "type-parameters",
       parentScope,
       node,
-      false
+      false,
     );
 
     this.scopeManager.__nestScope(scope);
diff --git a/eslint/babel-eslint-parser/src/index.js b/eslint/babel-eslint-parser/src/index.js
index 2769d4a0c0..c5c597017e 100644
--- a/eslint/babel-eslint-parser/src/index.js
+++ b/eslint/babel-eslint-parser/src/index.js
@@ -9,7 +9,7 @@ const SUPPORTED_BABEL_VERSION_RANGE =
   packageJson.peerDependencies["@babel/core"];
 const IS_RUNNING_SUPPORTED_VERSION = semver.satisfies(
   CURRENT_BABEL_VERSION,
-  SUPPORTED_BABEL_VERSION_RANGE
+  SUPPORTED_BABEL_VERSION_RANGE,
 );
 
 exports.parse = function(code, options) {
@@ -19,7 +19,7 @@ exports.parse = function(code, options) {
 exports.parseForESLint = function(code, options = {}) {
   if (!IS_RUNNING_SUPPORTED_VERSION) {
     throw new Error(
-      `babel-eslint@${packageJson.version} does not support @babel/core@${CURRENT_BABEL_VERSION}. Please downgrade to babel-eslint@^10 or upgrade to @babel/core@${SUPPORTED_BABEL_VERSION_RANGE}`
+      `babel-eslint@${packageJson.version} does not support @babel/core@${CURRENT_BABEL_VERSION}. Please downgrade to babel-eslint@^10 or upgrade to @babel/core@${SUPPORTED_BABEL_VERSION_RANGE}`,
     );
   }
 
diff --git a/eslint/babel-eslint-parser/src/parse.js b/eslint/babel-eslint-parser/src/parse.js
index 3930bb0405..5ae4db7e30 100644
--- a/eslint/babel-eslint-parser/src/parse.js
+++ b/eslint/babel-eslint-parser/src/parse.js
@@ -46,7 +46,7 @@ module.exports = function(code, options) {
     if (config !== null) {
       if (!config.hasFilesystemConfig()) {
         throw new Error(
-          `No Babel config file detected for ${config.options.filename}. Either disable config file checking with requireConfigFile: false, or configure Babel so that it can find the config files.`
+          `No Babel config file detected for ${config.options.filename}. Either disable config file checking with requireConfigFile: false, or configure Babel so that it can find the config files.`,
         );
       }
 
diff --git a/eslint/babel-eslint-parser/src/visitor-keys.js b/eslint/babel-eslint-parser/src/visitor-keys.js
index 2ac01887f1..236cf0a782 100644
--- a/eslint/babel-eslint-parser/src/visitor-keys.js
+++ b/eslint/babel-eslint-parser/src/visitor-keys.js
@@ -7,9 +7,9 @@ module.exports = Object.assign(
   {
     Literal: ESLINT_VISITOR_KEYS.Literal,
     MethodDefinition: ["decorators"].concat(
-      ESLINT_VISITOR_KEYS.MethodDefinition
+      ESLINT_VISITOR_KEYS.MethodDefinition,
     ),
     Property: ["decorators"].concat(ESLINT_VISITOR_KEYS.Property),
   },
-  BABEL_VISITOR_KEYS
+  BABEL_VISITOR_KEYS,
 );
diff --git a/eslint/babel-eslint-plugin-development/src/rules/no-undefined-identifier.js b/eslint/babel-eslint-plugin-development/src/rules/no-undefined-identifier.js
index 7a433b160c..c1b4b8a993 100644
--- a/eslint/babel-eslint-plugin-development/src/rules/no-undefined-identifier.js
+++ b/eslint/babel-eslint-plugin-development/src/rules/no-undefined-identifier.js
@@ -32,7 +32,7 @@ module.exports = {
         ) {
           context.report(
             node,
-            "Use path.scope.buildUndefinedNode() to create an undefined identifier directly."
+            "Use path.scope.buildUndefinedNode() to create an undefined identifier directly.",
           );
         }
       },
diff --git a/eslint/babel-eslint-plugin-development/src/rules/plugin-name.js b/eslint/babel-eslint-plugin-development/src/rules/plugin-name.js
index 11dd02808a..58a4bc9f63 100644
--- a/eslint/babel-eslint-plugin-development/src/rules/plugin-name.js
+++ b/eslint/babel-eslint-plugin-development/src/rules/plugin-name.js
@@ -44,7 +44,7 @@ module.exports = {
       if (!returnValue.properties.some(p => p.key.name === "name")) {
         context.report(
           returnValue,
-          "This Babel plugin doesn't have a 'name' property."
+          "This Babel plugin doesn't have a 'name' property.",
         );
       }
     }
diff --git a/eslint/babel-eslint-plugin-development/src/utils/is-from-babel-types.js b/eslint/babel-eslint-plugin-development/src/utils/is-from-babel-types.js
index 3045616217..36ab618817 100644
--- a/eslint/babel-eslint-plugin-development/src/utils/is-from-babel-types.js
+++ b/eslint/babel-eslint-plugin-development/src/utils/is-from-babel-types.js
@@ -6,7 +6,7 @@ const isBabelPluginFactory = require("./is-babel-plugin-factory");
 // is a reference to a @babel/types export.
 module.exports = function isFromBabelTypes(
   origin /*: ReferenceOrigin */,
-  scope /*: Scope */
+  scope /*: Scope */,
 ) {
   if (origin.kind === "import" && origin.source === "@babel/types") {
     // imported from @babel/types