Merge pull request #72 from mainmatter/eslint-v9

chore: upgrade eslint to v9 and flat config

eslint.config.js

@@ -0,0 +1,62 @@
+import js from '@eslint/js';
+import eslintConfigPrettier from 'eslint-config-prettier';
+import eslintPluginSvelte from 'eslint-plugin-svelte';
+import globals from 'globals';
+import svelteParser from 'svelte-eslint-parser';
+import tsEslint from 'typescript-eslint';
+import playwright from 'eslint-plugin-playwright';
+
+export default tsEslint.config(
+	js.configs.recommended,
+	...tsEslint.configs.recommended,
+	...eslintPluginSvelte.configs['flat/recommended'],
+	eslintConfigPrettier,
+	{
+		...playwright.configs['flat/recommended'],
+		files: ['tests/**'],
+	},
+	{
+		languageOptions: {
+			ecmaVersion: 2020,
+			sourceType: 'module',
+			globals: {
+				...globals.node,
+				...globals.browser,
+				...globals.es2017,
+			},
+			parser: tsEslint.parser,
+			parserOptions: {
+				extraFileExtensions: ['.svelte'],
+			},
+		},
+		plugins: {
+			'@typescript-eslint': tsEslint.plugin,
+		},
+	},
+	{
+		files: ['**/*.svelte'],
+		languageOptions: {
+			parser: svelteParser,
+			parserOptions: {
+				parser: tsEslint.parser,
+				svelteFeatures: {
+					experimentalGenerics: true,
+				},
+			},
+		},
+	},
+	{
+		ignores: [
+			'**/.svelte-kit',
+			'**/build',
+			'**/node_modules',
+			'**/static',
+			'**/test-results',
+			'**/expected-transforms',
+			'**/dist',
+			'**/coverage',
+			'CHANGELOG.md',
+			'.release-plan-json',
+		],
+	},
+);

package.json

@@ -59,13 +59,17 @@
 		"@testing-library/jest-dom": "^6.4.2",
 		"@testing-library/svelte": "^5.0.0",
 		"@types/eslint": "8.56.10",
+		"@types/eslint-config-prettier": "^6.11.3",
+		"@types/eslint__js": "^8.42.3",
 		"@typescript-eslint/eslint-plugin": "^7.0.0",
 		"@typescript-eslint/parser": "^7.0.0",
 		"@vitest/coverage-v8": "^1.6.0",
 		"@vitest/ui": "^1.4.0",
-		"eslint": "^8.57.0",
+		"eslint": "^9.2.0",
 		"eslint-config-prettier": "^9.1.0",
+		"eslint-plugin-playwright": "^1.6.1",
 		"eslint-plugin-svelte": "^2.35.1",
+		"globals": "^15.2.0",
 		"happy-dom": "^14.3.9",
 		"prettier": "^3.2.5",
 		"prettier-plugin-svelte": "^3.2.2",
@@ -76,6 +80,7 @@
 		"tslib": "^2.6.2",
 		"tsm": "^2.3.0",
 		"typescript": "^5.4.2",
+		"typescript-eslint": "^7.9.0",
 		"vite": "^5.1.5",
 		"vitest": "^1.3.1"
 	},