chore: moves eslint to flat config, migrates to eslint 9

configs/.dependency-cruiser-show-metrics-config.mjs

@@ -53,7 +53,8 @@ export default {
         theme: {
           replace: false,
           graph: {
-            splines: "ortho", // "ortho" looks nicer, but with the full graph takes long
+            // "ortho" looks nicer, but with the full graph takes long
+            splines: "ortho",
           },
           modules: [
             {

eslint.config.mjs

@@ -0,0 +1,107 @@
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import typescriptEslint from "@typescript-eslint/eslint-plugin";
+import tsParser from "@typescript-eslint/parser";
+import globals from "globals";
+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 [
+  {
+    ignores: [
+      "**/.pnp.cjs",
+      "**/.yarn",
+      "**/node_modules",
+      "**/coverage",
+      "**/tmp",
+      "src/**/*.schema.mjs",
+      "src/report/dot-webpage/svg-in-html-snippets/script.cjs",
+      "test/integration/**/*",
+      "test/*/__fixtures__/**/*",
+      "test/*/*/__fixtures__/**/*",
+      "test/*/*/*/__fixtures__/**/*",
+      "test/*/__mocks__/**/*",
+      "test/*/*/__mocks__/**/*",
+      "types/**/*",
+    ],
+  },
+  ...compat.extends("moving-meadow", "plugin:@typescript-eslint/recommended"),
+  {
+    plugins: {
+      "@typescript-eslint": typescriptEslint,
+    },
+
+    languageOptions: {
+      parser: tsParser,
+      ecmaVersion: 2021,
+      sourceType: "script",
+    },
+
+    rules: {
+      "@typescript-eslint/no-explicit-any": "off",
+      "@typescript-eslint/no-var-requires": "off",
+      "@typescript-eslint/no-unused-vars": "off",
+      "no-unused-vars": "off",
+      "budapestian/global-constant-pattern": "off",
+      "security/detect-non-literal-fs-filename": "off",
+      "import/exports-last": "off",
+      "import/no-unresolved": "off",
+      "@typescript-eslint/no-require-imports": "off",
+      "no-param-reassign": "error",
+      "n/no-missing-import": "off",
+      "n/no-missing-require": "off",
+      "unicorn/no-empty-file": "off",
+      "unicorn/no-useless-fallback-in-spread": "off",
+      // eslint-disable-next-line no-magic-numbers
+      complexity: ["warn", { max: 10, variant: "classic" }],
+    },
+  },
+  {
+    files: ["**/*.d.ts"],
+
+    rules: {
+      "init-declarations": "off",
+    },
+  },
+  {
+    files: ["test/**/*.{js,mjs,cjs}"],
+
+    languageOptions: {
+      globals: {
+        ...globals.mocha,
+      },
+    },
+
+    rules: {
+      complexity: "off",
+      "max-lines": "off",
+      "max-lines-per-function": "off",
+      "no-prototype-builtins": "off",
+
+      "mocha/valid-suite-description": [
+        "error",
+        {
+          pattern: "^\\[[EIU]\\]",
+          suiteNames: ["describe"],
+          message:
+            "start suite titles with [E], [I] or [U] to mark them as E2E, Integration or Unit test suite",
+        },
+      ],
+    },
+  },
+  {
+    files: ["**/*.mjs"],
+
+    rules: {
+      "n/no-unsupported-features/es-syntax": "off",
+    },
+  },
+];