refactor(eslint): use flat config for eslint

packages/mailer/eslint.config.cjs

@@ -0,0 +1,12 @@
+const configCustom = require("eslint-config-custom");
+
+module.exports = [
+  ...configCustom,
+  {
+    files: [".js", ".cjs", ".mjs", ".ts", ".cts", ".mts"],
+    extends: ["eslint:recommended"],
+  },
+  {
+    ignores: ["**/*.log*", "coverage", "dist", "node_modules", "eslint.config.cjs"],
+  },
+];

packages/mailer/package.json

@@ -24,8 +24,8 @@
   ],
   "scripts": {
     "build": "vite build && tsc --emitDeclarationOnly && mv dist/src dist/types",
-    "lint": "eslint . --ext .js,.jsx,.cjs,.mjs,.ts,.tsx,.cts,.mts --ignore-path .gitignore",
-    "lint:fix": "eslint . --ext .js,.jsx,.cjs,.mjs,.ts,.tsx,.cts,.mts --fix --ignore-path .gitignore",
+    "lint": "eslint",
+    "lint:fix": "eslint . --fix",
     "sort-package": "npx sort-package-json",
     "test": "vitest run --coverage",
     "typecheck": "tsc --noEmit -p tsconfig.json --composite false"

tools/eslint-config-custom/index.cjs

@@ -0,0 +1,130 @@
+const { fixupConfigRules, fixupPluginRules } = require("@eslint/compat");
+const typescriptEslint = require("@typescript-eslint/eslint-plugin");
+const eslintImport = require("eslint-plugin-import");
+const n = require("eslint-plugin-n");
+const prettier = require("eslint-plugin-prettier");
+const promise = require("eslint-plugin-promise");
+const unicorn = require("eslint-plugin-unicorn");
+const globals = require("globals");
+const tsParser = require("@typescript-eslint/parser");
+const path = require("node:path");
+const { fileURLToPath } = require("node:url");
+const js = require("@eslint/js");
+const { FlatCompat } = require("@eslint/eslintrc");
+
+const dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+    baseDirectory: dirname,
+    recommendedConfig: js.configs.recommended,
+    allConfig: js.configs.all
+});
+
+module.exports = [...fixupConfigRules(compat.extends(
+    "eslint:recommended",
+    "plugin:n/recommended",
+    "plugin:import/recommended",
+    "plugin:import/typescript",
+    "plugin:prettier/recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:unicorn/recommended",
+    "prettier",
+)), {
+    plugins: {
+        "@typescript-eslint": fixupPluginRules(typescriptEslint),
+        import: fixupPluginRules(eslintImport),
+        n: fixupPluginRules(n),
+        prettier: fixupPluginRules(prettier),
+        promise,
+        unicorn: fixupPluginRules(unicorn),
+    },
+
+    languageOptions: {
+        globals: {
+            ...globals.browser,
+            ...globals.node,
+        },
+
+        parser: tsParser,
+        ecmaVersion: "latest",
+        sourceType: "module",
+    },
+
+    settings: {
+        node: {
+            tryExtensions: [".cjs", ".js", ".json", ".node", ".ts"],
+        },
+    },
+
+    rules: {
+        curly: ["error", "all"],
+        "brace-style": ["error", "1tbs"],
+
+        "import/order": ["error", {
+            alphabetize: {
+                order: "asc",
+                caseInsensitive: true,
+            },
+
+            groups: [
+                "builtin",
+                "external",
+                "internal",
+                ["parent", "sibling"],
+                "index",
+                "object",
+                "type",
+            ],
+
+            "newlines-between": "always",
+        }],
+
+        "n/no-unpublished-import": ["error", {
+            allowModules: ["@faker-js/faker", "mercurius-codegen", "query-string"],
+        }],
+
+        "n/no-unsupported-features/es-syntax": ["error", {
+            ignores: ["modules"],
+        }],
+
+        "prettier/prettier": "error",
+
+        "unicorn/filename-case": ["error", {
+            cases: {
+                camelCase: true,
+                snakeCase: true,
+            },
+        }],
+
+        "unicorn/import-style": ["error", {
+            styles: {
+                "node:path": {
+                    named: true,
+                },
+            },
+        }],
+
+        "unicorn/numeric-separators-style": ["error", {
+            number: {
+                minimumDigits: 6,
+                groupLength: 3,
+            },
+        }],
+
+        "unicorn/prefer-structured-clone": "off",
+
+        "unicorn/prevent-abbreviations": ["error", {
+            allowList: {
+                db: true,
+                docs: true,
+                env: true,
+                err: true,
+                i: true,
+                param: true,
+                req: true,
+                res: true,
+            },
+        }],
+    },
+}, {
+    files: ["**/*.spec.ts"],
+}];

tools/eslint-config-custom/package.json

@@ -2,11 +2,14 @@
   "name": "eslint-config-custom",
   "version": "0.72.1",
   "license": "MIT",
-  "main": "index.js",
+  "main": "index.cjs",
   "scripts": {
-    "sort-package": "npx sort-package-json"
+    "sort-package": "npx sort-package-json",
+    "lint": "eslint .",
+    "lint:fix": "eslint . --fix"
   },
   "dependencies": {
+    "@eslint/compat": "1.1.1",
     "@typescript-eslint/eslint-plugin": "7.18.0",
     "@typescript-eslint/parser": "7.18.0",
     "eslint-config-prettier": "9.1.0",