fix: go back to eslint 8 until typescript-eslint supports eslint 9 (#12124)

Author: benmccann

.changeset/chilly-wombats-roll.md

@@ -2,4 +2,4 @@
 'create-svelte': patch
 ---
 
-fix: set the correct for the ESLint config ignores
+fix: go back to eslint 8 until typescript-eslint supports eslint 9

.eslintrc.json

@@ -0,0 +1,18 @@
+{
+	"root": true,
+	"extends": "@sveltejs",
+	"env": {
+		"es2022": true
+	},
+	"ignorePatterns": [
+		"packages/create-svelte/shared/",
+		"packages/kit/test/prerendering/*/build",
+		"packages/adapter-static/test/apps/*/build",
+		"packages/adapter-cloudflare/files",
+		"packages/adapter-netlify/files",
+		"packages/adapter-node/files"
+	],
+	"rules": {
+		"no-undef": "off"
+	}
+}

eslint.config.js

@@ -22,14 +22,14 @@
 	},
 	"devDependencies": {
 		"@changesets/cli": "^2.27.1",
-		"@sveltejs/eslint-config": "^7.0.1",
+		"@sveltejs/eslint-config": "^6.0.4",
 		"@svitejs/changesets-changelog-github-compact": "^1.1.0",
-		"eslint": "^9.0.0",
+		"@typescript-eslint/eslint-plugin": "^7.0.0",
+		"eslint": "^8.56.0",
 		"eslint-config-prettier": "^9.1.0",
-		"eslint-plugin-svelte": "^2.36.0",
+		"eslint-plugin-svelte": "^2.35.1",
 		"eslint-plugin-unicorn": "^52.0.0",
-		"playwright": "^1.41.0",
-		"typescript-eslint": "^7.6.0"
+		"playwright": "^1.41.0"
 	},
 	"packageManager": "[email protected]",
 	"engines": {

package.json

@@ -0,0 +1,31 @@
+/** @type { import("eslint").Linter.Config } */
+module.exports = {
+	root: true,
+	extends: [
+		'eslint:recommended',
+		'plugin:@typescript-eslint/recommended',
+		'plugin:svelte/recommended',
+		'prettier'
+	],
+	parser: '@typescript-eslint/parser',
+	plugins: ['@typescript-eslint'],
+	parserOptions: {
+		sourceType: 'module',
+		ecmaVersion: 2020,
+		extraFileExtensions: ['.svelte']
+	},
+	env: {
+		browser: true,
+		es2017: true,
+		node: true
+	},
+	overrides: [
+		{
+			files: ['*.svelte'],
+			parser: 'svelte-eslint-parser',
+			parserOptions: {
+				parser: '@typescript-eslint/parser'
+			}
+		}
+	]
+};

packages/create-svelte/shared/+eslint+prettier+typescript/.eslintrc.cjs

@@ -0,0 +1,15 @@
+/** @type { import("eslint").Linter.Config } */
+module.exports = {
+	root: true,
+	extends: ['eslint:recommended', 'plugin:svelte/recommended', 'prettier'],
+	parserOptions: {
+		sourceType: 'module',
+		ecmaVersion: 2020,
+		extraFileExtensions: ['.svelte']
+	},
+	env: {
+		browser: true,
+		es2017: true,
+		node: true
+	}
+};

packages/create-svelte/shared/+eslint+prettier+typescript/eslint.config.js

@@ -1,5 +1,5 @@
 {
 	"devDependencies": {
-		"eslint-plugin-svelte": "^2.36.0"
+		"eslint-plugin-svelte": "^2.36.0-next.4"
 	}
 }

packages/create-svelte/shared/+eslint+prettier-typescript/.eslintrc.cjs

@@ -0,0 +1,30 @@
+/** @type { import("eslint").Linter.Config } */
+module.exports = {
+	root: true,
+	extends: [
+		'eslint:recommended',
+		'plugin:@typescript-eslint/recommended',
+		'plugin:svelte/recommended'
+	],
+	parser: '@typescript-eslint/parser',
+	plugins: ['@typescript-eslint'],
+	parserOptions: {
+		sourceType: 'module',
+		ecmaVersion: 2020,
+		extraFileExtensions: ['.svelte']
+	},
+	env: {
+		browser: true,
+		es2017: true,
+		node: true
+	},
+	overrides: [
+		{
+			files: ['*.svelte'],
+			parser: 'svelte-eslint-parser',
+			parserOptions: {
+				parser: '@typescript-eslint/parser'
+			}
+		}
+	]
+};