ESLint 9 update

Author: ciscoheat

.eslintrc.cjs

@@ -0,0 +1,84 @@
+const {
+    defineConfig,
+    globalIgnores,
+} = require("eslint/config");
+
+const tsParser = require("@typescript-eslint/parser");
+const typescriptEslint = require("@typescript-eslint/eslint-plugin");
+const globals = require("globals");
+const parser = require("svelte-eslint-parser");
+const js = require("@eslint/js");
+
+const {
+    FlatCompat,
+} = require("@eslint/eslintrc");
+
+const compat = new FlatCompat({
+    baseDirectory: __dirname,
+    recommendedConfig: js.configs.recommended,
+    allConfig: js.configs.all
+});
+
+module.exports = defineConfig([{
+    extends: compat.extends(
+        "eslint:recommended",
+        "plugin:@typescript-eslint/recommended",
+        "plugin:svelte/recommended",
+        "plugin:dci-lint/recommended",
+        "prettier",
+    ),
+
+    languageOptions: {
+        parser: tsParser,
+        sourceType: "module",
+        ecmaVersion: 2020,
+
+        parserOptions: {
+            extraFileExtensions: [".svelte"],
+        },
+
+        globals: {
+            ...globals.browser,
+            ...globals.node,
+        },
+    },
+
+    plugins: {
+        "@typescript-eslint": typescriptEslint,
+    },
+
+    rules: {
+        "dci-lint/literal-role-contracts": "off",
+    },
+}, {
+    files: ["**/*.svelte"],
+
+    languageOptions: {
+        parser: parser,
+
+        parserOptions: {
+            parser: "@typescript-eslint/parser",
+        },
+    },
+}, {
+    files: ["src/lib/**"],
+
+    rules: {
+        "no-console": ["error", {
+            allow: ["warn"],
+        }],
+    },
+}, globalIgnores([
+    "**/.DS_Store",
+    "**/node_modules",
+    "build",
+    ".svelte-kit",
+    "package",
+    "**/.env",
+    "**/.env.*",
+    "!**/.env.example",
+    "dist",
+    "**/pnpm-lock.yaml",
+    "**/package-lock.json",
+    "**/yarn.lock",
+])]);

eslint.config.cjs

@@ -186,6 +186,8 @@
 		"ts-deepmerge": "^7.0.3"
 	},
 	"devDependencies": {
+		"@eslint/eslintrc": "^3.3.1",
+		"@eslint/js": "^9.28.0",
 		"@sveltejs/adapter-auto": "^6.0.1",
 		"@sveltejs/kit": "^2.21.1",
 		"@sveltejs/package": "^2.3.11",
@@ -194,14 +196,13 @@
 		"@types/node": "^22.15.29",
 		"@types/throttle-debounce": "^5.0.2",
 		"@types/uuid": "^9.0.8",
-		"@typescript-eslint/eslint-plugin": "^6.21.0",
-		"@typescript-eslint/parser": "^6.21.0",
 		"@valibot/i18n": "1.0.0-beta.2",
 		"decimal.js": "^10.5.0",
-		"eslint": "^8.57.1",
-		"eslint-config-prettier": "^9.1.0",
-		"eslint-plugin-dci-lint": "^0.3.2",
-		"eslint-plugin-svelte": "^2.46.1",
+		"eslint": "^9.18.0",
+		"eslint-config-prettier": "^10.0.1",
+		"eslint-plugin-dci-lint": "^0.9.1",
+		"eslint-plugin-svelte": "^3.0.0",
+		"globals": "^16.2.0",
 		"i18next": "^23.16.8",
 		"only-allow": "^1.2.1",
 		"prettier": "^3.5.3",
@@ -216,6 +217,7 @@
 		"throttle-debounce": "^5.0.2",
 		"tslib": "^2.8.1",
 		"typescript": "^5.8.3",
+		"typescript-eslint": "^8.33.0",
 		"uuid": "^9.0.1",
 		"vite": "^6.3.5",
 		"vitest": "^1.6.1",