Eslint v9 upgrade

eslint.config.mjs

@@ -0,0 +1,100 @@
+// @ts-check
+
+import eslint from "@eslint/js";
+import tsEslint from "typescript-eslint";
+import unusedImports from "eslint-plugin-unused-imports";
+
+export default tsEslint.config(
+  {
+    ignores: [
+      "build/",
+      "dist/",
+      ".vscode/",
+      "node_modules/",
+      "templates/",
+      "public/",
+      ".circleci/",
+    ],
+  },
+  {
+    files: ["src/**/*.ts", "test/**/*.ts"],
+    extends: [
+      eslint.configs.recommended,
+      ...tsEslint.configs.recommendedTypeChecked,
+    ],
+    plugins: {
+      "unused-imports": unusedImports,
+    },
+    rules: {
+      // Additional rules:
+      ...{
+        eqeqeq: "error",
+        "no-console": "error",
+        "prefer-template": "error",
+        "@typescript-eslint/no-shadow": "error",
+        "no-unreachable": "error",
+        "unused-imports/no-unused-imports": "warn",
+      },
+
+      // Additional config for rules:
+      ...{
+        "@typescript-eslint/explicit-module-boundary-types": [
+          "error",
+          { allowArgumentsExplicitlyTypedAsAny: true },
+        ],
+        "@typescript-eslint/no-unused-vars": [
+          "warn",
+          { args: "none", caughtErrors: "none" },
+        ],
+      },
+
+      // Disabled rules:
+      ...{
+        "prefer-const": "off",
+        "no-shadow": "off", // Replaced with "@typescript-eslint/no-shadow".
+        "no-unused-vars": "off", // Replaced with "@typescript-eslint/no-unused-vars".
+        "@typescript-eslint/no-non-null-assertion": "off",
+        "@typescript-eslint/no-explicit-any": "off",
+        "@typescript-eslint/no-unsafe-member-access": "off",
+        "@typescript-eslint/unbound-method": "off",
+        "@typescript-eslint/ban-ts-comment": "off",
+        "@typescript-eslint/no-unsafe-argument": "off",
+        "@typescript-eslint/no-empty-object-type": "off",
+      },
+
+      // Rules to be enabled:
+      ...{
+        "@typescript-eslint/ban-types": "off",
+        "@typescript-eslint/no-unsafe-assignment": "off",
+        "@typescript-eslint/no-unsafe-return": "off",
+        "@typescript-eslint/no-unsafe-call": "off",
+        "@typescript-eslint/restrict-template-expressions": "off",
+        "@typescript-eslint/no-non-null-asserted-optional-chain": "off",
+      },
+
+      // Rules to be discussed:
+      ...{
+        "prefer-spread": "off",
+        "no-async-promise-executor": "off",
+        "no-case-declarations": "off",
+        "no-fallthrough": "off",
+        "no-inner-declarations": "off",
+        "@typescript-eslint/require-await": "off",
+        "@typescript-eslint/prefer-regexp-exec": "off",
+      },
+    },
+    languageOptions: {
+      parserOptions: {
+        projectService: true,
+        tsconfigRootDir: import.meta.dirname,
+        warnOnUnsupportedTypeScriptVersion: false,
+      },
+    },
+  },
+  {
+    files: ["test/**/*.ts"],
+    rules: {
+      "@typescript-eslint/no-unused-expressions": "off",
+    },
+  }
+);

package.json

@@ -19,7 +19,7 @@
     "clean": "ts-node --transpile-only src/index clean",
     "coverage-show": "open-cli build/coverage/index.html",
     "ci": "ts-node --transpile-only src/index ci --no-format",
-    "lint": "eslint . --ext .ts"
+    "lint": "eslint"
   },
   "author": "[email protected]",
   "license": "MIT",
@@ -82,17 +82,16 @@
     "parser": "typescript"
   },
   "dependencies": {
+    "@eslint/js": "9.10.0",
     "@types/chai": "4.3.19",
+    "@types/eslint__js": "8.42.3",
     "@types/mocha": "10.0.8",
-    "@typescript-eslint/eslint-plugin": "7.16.1",
-    "@typescript-eslint/parser": "7.16.1",
     "async": "3.2.6",
     "chai": "4.4.1",
     "chokidar": "3.6.0",
-    "eslint": "8.57.0",
+    "eslint": "9.10.0",
     "eslint-config-prettier": "9.1.0",
-    "eslint-plugin-es": "4.1.0",
-    "eslint-plugin-unused-imports": "3.2.0",
+    "eslint-plugin-unused-imports": "4.1.4",
     "glob": "8.1.0",
     "handlebars": "4.7.8",
     "husky": "9.1.6",
@@ -110,12 +109,12 @@
     "tslib": "2.7.0",
     "tsutils": "3.21.0",
     "typescript": "5.6.2",
+    "typescript-eslint": "8.6.0",
     "ws": "7.5.2",
     "yargs": "15.4.1"
   },
   "devDependencies": {
     "@types/async": "3.2.24",
-    "@types/eslint": "8.56.10",
     "@types/glob": "7.2.0",
     "@types/inquirer": "6.5.0",
     "@types/node": "22.5.5",