Migrate to a new eslint

Linter is not yet autoenabled, need to fix some issues first in npm run test

Signed-off-by: Alexander Borsuk <me@alex.bio>

.eslintrc.yml

@@ -1,18 +0,0 @@
-env:
-  es2020: true
-  worker: true
-extends: ["plugin:@typescript-eslint/recommended"]
-parser: "@typescript-eslint/parser"
-parserOptions:
-  ecmaVersion: 2020
-  ecmaFeatures:
-    impliedStrict: true
-  sourceType: module
-root: true
-rules:
-  indent: [error, 2, { SwitchCase: 1 }]
-  semi: [error, always]
-  quotes: [error, single, avoid-escape]
-  no-trailing-spaces: [error]
-  no-unused-vars: [error, { argsIgnorePattern: ^_ }]
-  prefer-const: [error, { destructuring: all }]

eslint.config.mjs

@@ -0,0 +1,50 @@
+import globals from "globals";
+import tsParser from "@typescript-eslint/parser";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import js from "@eslint/js";
+import { FlatCompat } from "@eslint/eslintrc";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+    baseDirectory: __dirname,
+    recommendedConfig: js.configs.recommended,
+    allConfig: js.configs.all
+});
+
+export default [...compat.extends("plugin:@typescript-eslint/recommended"), {
+    languageOptions: {
+        globals: {
+            ...globals.worker,
+        },
+
+        parser: tsParser,
+        ecmaVersion: 2020,
+        sourceType: "module",
+
+        parserOptions: {
+            ecmaFeatures: {
+                impliedStrict: true,
+            },
+        },
+    },
+
+    rules: {
+        indent: ["error", 2, {
+            SwitchCase: 1,
+        }],
+
+        semi: ["error", "always"],
+        quotes: ["error", "single", "avoid-escape"],
+        "no-trailing-spaces": ["error"],
+
+        "no-unused-vars": ["error", {
+            argsIgnorePattern: "^_",
+        }],
+
+        "prefer-const": ["error", {
+            destructuring: "all",
+        }],
+    },
+}];

package.json

@@ -13,14 +13,19 @@
   "author": "Alexander Borsuk <me@alex.bio>",
   "license": "MIT",
   "devDependencies": {
-    "@cloudflare/workers-types": "^4.20240620.0",
-    "esbuild": "^0.21.5",
-    "eslint": "^9.5.0",
-    "prettier": "^3.3.2",
-    "typescript": "^5.5.2",
-    "wrangler": "^3.61.0"
+    "@cloudflare/workers-types": "^4.20240729.0",
+    "@eslint/eslintrc": "^3.1.0",
+    "@eslint/js": "^9.8.0",
+    "@typescript-eslint/eslint-plugin": "^8.0.0",
+    "@typescript-eslint/parser": "^8.0.0",
+    "esbuild": "^0.23.0",
+    "eslint": "^9.8.0",
+    "globals": "^15.9.0",
+    "prettier": "^3.3.3",
+    "typescript": "^5.5.4",
+    "wrangler": "^3.68.0"
   },
   "dependencies": {
-    "@cloudflare/kv-asset-handler": "^0.3.3"
+    "@cloudflare/kv-asset-handler": "^0.3.4"
   }
 }