Remove Babel, set language options to defaults

Author: AaronMoat

.changeset/friendly-geckos-bathe.md

@@ -1,5 +1,9 @@
 ---
-'eslint-config-seek': minor
+'eslint-config-seek': major
 ---
 
-Babel now treats all Javascript files to have a [`sourceType`](https://babeljs.io/docs/options#sourcetype) of `module` (previously `script`).
+Some [language options](https://eslint.org/docs/latest/use/configure/language-options) have been restored to defaults:
+
+- `sourceType` is now set to the default of `module` (previously `script` in some scenarios).
+- `ecmaVersion` is now set to the default of `latest` (previously `2022` and `6`)
+- Babel has been removed

.changeset/giant-eagles-fetch.md

@@ -4,7 +4,6 @@
 
 Upgrade a number of dependencies. These should have no/minimal impact.
 
-- `@babel/core`, `@babel/eslint-parser`, `@babel/preset-react`
 - `eslint-plugin-cypress`
 - `eslint-config-prettier`
 - `eslint-plugin-jest`

.changeset/small-jeans-wave.md

@@ -9,7 +9,6 @@ These changes may affect your project setup if you are customising your ESLint c
 - https://eslint.org/docs/latest/use/migrate-to-9.0.0
 - https://typescript-eslint.io/blog/announcing-typescript-eslint-v8
 
+In addition, through these major upgrades, some lint rules have changed or have been renamed. You will likely need to autofix and/or adjust your code after running ESLint.
 
-In addition, through these major upgrades, some lint rules have changed or have been renamed. You will likely need to autofix and/or adjust your code after running ESLint. 
-
-As part of this migration, this project has migrated to Flat ESLint configuration. Read the migration guide: https://eslint.org/docs/latest/use/configure/migration-guide. 
+As part of this migration, this project has migrated to Flat ESLint configuration. Read the migration guide: https://eslint.org/docs/latest/use/configure/migration-guide.

base.js

@@ -1,6 +1,5 @@
 const importX = require('eslint-plugin-import-x');
 const globals = require('globals');
-const babelParser = require('@babel/eslint-parser');
 const tsParser = require('@typescript-eslint/parser');
 const jestPlugin = require('eslint-plugin-jest');
 const cypress = require('eslint-plugin-cypress');
@@ -112,9 +111,7 @@ module.exports = [
         ...globals.node,
       },
 
-      parser: babelParser,
       ecmaVersion: 6,
-      sourceType: 'module',
 
       parserOptions: {
         requireConfigFile: false,
@@ -138,8 +135,6 @@ module.exports = [
 
     languageOptions: {
       parser: tsParser,
-      ecmaVersion: 2022,
-      sourceType: 'module',
 
       parserOptions: {
         projectService: true,

index.js

@@ -42,18 +42,7 @@ module.exports = [
     },
 
     languageOptions: {
-      globals: {
-        ...globals.browser,
-      },
-
-      ecmaVersion: 6,
-      sourceType: 'module',
-
-      parserOptions: {
-        babelOptions: {
-          presets: [require.resolve('@babel/preset-react')],
-        },
-      },
+      globals: globals.browser,
     },
 
     settings: {

package.json

@@ -24,9 +24,6 @@
   },
   "homepage": "https://github.com/seek-oss/eslint-config-seek#readme",
   "dependencies": {
-    "@babel/core": "^7.25.2",
-    "@babel/eslint-parser": "^7.25.1",
-    "@babel/preset-react": "^7.24.7",
     "@eslint/compat": "^1.1.1",
     "@eslint/eslintrc": "^3.1.0",
     "@eslint/js": "^9.9.1",