Update tests and linter to run properly (#219)

* Fix test config.
* Update ESLint config file to v9 format.

Author: GLips

.eslintrc

@@ -0,0 +1,34 @@
+import js from "@eslint/js";
+import tseslint from "@typescript-eslint/eslint-plugin";
+import tsparser from "@typescript-eslint/parser";
+import prettier from "eslint-config-prettier";
+
+export default [
+  js.configs.recommended,
+  {
+    files: ["**/*.ts", "**/*.tsx"],
+    languageOptions: {
+      parser: tsparser,
+      parserOptions: {
+        ecmaVersion: 2022,
+        sourceType: "module",
+      },
+    },
+    plugins: {
+      "@typescript-eslint": tseslint,
+    },
+    rules: {
+      ...tseslint.configs.recommended.rules,
+      "@typescript-eslint/explicit-function-return-type": "warn",
+      "@typescript-eslint/no-unused-vars": ["error", { argsIgnorePattern: "^_" }],
+      "@typescript-eslint/no-explicit-any": "warn",
+    },
+  },
+  {
+    files: ["**/*.ts", "**/*.tsx"],
+    rules: prettier.rules,
+  },
+  {
+    ignores: ["dist/**", "node_modules/**"],
+  },
+];

eslint.config.js

@@ -1,13 +1,24 @@
-module.exports = {
-  preset: 'ts-jest',
-  testEnvironment: 'node',
+export default {
+  preset: "ts-jest/presets/default-esm",
+  extensionsToTreatAsEsm: [".ts"],
+  testEnvironment: "node",
   transform: {
-    '^.+\\.tsx?$': ['ts-jest', {
-      tsconfig: 'tsconfig.json',
-    }],
+    "^.+\\.tsx?$": [
+      "ts-jest",
+      {
+        useESM: true,
+        tsconfig: {
+          module: "ESNext",
+          verbatimModuleSyntax: false,
+        },
+      },
+    ],
   },
-  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
+  moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json", "node"],
   moduleNameMapper: {
-    '^~/(.*)$': '<rootDir>/src/$1'
-  }
+    "^~/(.*)\.js$": "<rootDir>/src/$1.ts",
+    "^~/(.*)$": "<rootDir>/src/$1",
+    "^(\\.{1,2}/.*)\\.js$": "$1",
+  },
+  modulePaths: ["<rootDir>/src"],
 };

jest.config.js

@@ -20,7 +20,7 @@
     "start:http": "node dist/cli.js",
     "dev": "cross-env NODE_ENV=development tsup --watch",
     "dev:cli": "cross-env NODE_ENV=development tsup --watch -- --stdio",
-    "lint": "eslint . --ext .ts",
+    "lint": "eslint .",
     "format": "prettier --write \"src/**/*.ts\"",
     "inspect": "pnpx @modelcontextprotocol/inspector",
     "prepack": "pnpm build",
@@ -67,6 +67,7 @@
   "devDependencies": {
     "@changesets/changelog-github": "^0.5.1",
     "@changesets/cli": "^2.29.2",
+    "@eslint/js": "^9.33.0",
     "@types/express": "^5.0.0",
     "@types/jest": "^29.5.14",
     "@types/js-yaml": "^4.0.9",