test: fix linter errors and add linter to pre-commit hook

Author: snobbee

.husky/pre-commit

@@ -1 +1,2 @@
 pnpm run prettier-check
+pnpm run lint

eslint.global.mjs

@@ -0,0 +1,71 @@
+import eslint from "@eslint/js";
+import tseslint from "@typescript-eslint/eslint-plugin";
+import typescript from "@typescript-eslint/parser";
+import prettier from "eslint-config-prettier";
+import vitest from "eslint-plugin-vitest"; // Add Vitest plugin
+
+export default [
+    // JavaScript and TypeScript files
+    {
+        files: ["src/**/*.js", "src/**/*.cjs", "src/**/*.mjs", "src/**/*.ts"],
+        languageOptions: {
+            parser: typescript,
+            parserOptions: {
+                ecmaVersion: "latest",
+                sourceType: "module",
+                project: "./tsconfig.json", // Make sure your tsconfig includes @types/node
+            },
+            globals: {
+                // Add Node.js globals
+                NodeJS: "readonly",
+                console: "readonly",
+                process: "readonly",
+                Buffer: "readonly",
+                __dirname: "readonly",
+                __filename: "readonly",
+                module: "readonly",
+                require: "readonly",
+            },
+        },
+        plugins: {
+            "@typescript-eslint": tseslint,
+        },
+        rules: {
+            ...eslint.configs.recommended.rules,
+            ...tseslint.configs.recommended.rules,
+            "prefer-const": "warn",
+            "no-constant-binary-expression": "error",
+
+            // Disable no-undef as TypeScript handles this better
+            "no-undef": "off",
+            "@typescript-eslint/no-unsafe-function-type": "off",
+            // Customize TypeScript rules
+            "@typescript-eslint/no-explicit-any": "off",
+            "@typescript-eslint/no-unused-vars": [
+                "error",
+                {
+                    argsIgnorePattern: "^_",
+                    varsIgnorePattern: "^_",
+                    ignoreRestSiblings: true,
+                },
+            ],
+        },
+    },
+    // Vitest configuration
+    {
+        files: [
+            "src/**/*.test.js",
+            "src/**/*.test.ts",
+            "src/**/*.spec.js",
+            "src/**/*.spec.ts",
+        ],
+        plugins: {
+            vitest, // Register Vitest plugin
+        },
+        rules: {
+            ...vitest.configs.recommended.rules,
+        },
+    },
+    // Add prettier as the last config to override other formatting rules
+    prettier,
+];