Upgrade to ESLint 9

Author: mihaip

eslint.config.mjs

@@ -0,0 +1,148 @@
+import {defineConfig, globalIgnores} from "eslint/config";
+import {fixupConfigRules, fixupPluginRules} from "@eslint/compat";
+import typescriptEslint from "@typescript-eslint/eslint-plugin";
+import tsParser from "@typescript-eslint/parser";
+import path from "node:path";
+import {fileURLToPath} from "node:url";
+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 defineConfig([
+    globalIgnores([
+        "src/emulator/dingusppc.js",
+        "src/emulator/minivmac-*.js",
+        "src/emulator/ppc.js",
+        "src/emulator/previous.js",
+        "src/emulator/BasiliskII.js",
+        "src/emulator/SheepShaver.js",
+    ]),
+    {
+        extends: fixupConfigRules(
+            compat.extends(
+                "eslint:recommended",
+                "plugin:@typescript-eslint/recommended",
+                "plugin:react-hooks/recommended",
+                "plugin:import/recommended"
+            )
+        ),
+
+        plugins: {
+            "@typescript-eslint": fixupPluginRules(typescriptEslint),
+        },
+
+        languageOptions: {
+            parser: tsParser,
+            ecmaVersion: 5,
+            sourceType: "script",
+
+            parserOptions: {
+                project: true,
+                tsconfigRootDir: "./",
+            },
+        },
+
+        rules: {
+            "array-callback-return": "error",
+            "no-constant-binary-expression": "error",
+            "no-constructor-return": "error",
+            "no-promise-executor-return": "error",
+            "no-self-compare": "error",
+            "no-template-curly-in-string": "error",
+            "no-unmodified-loop-condition": "error",
+            "no-unreachable-loop": "error",
+
+            "require-atomic-updates": [
+                "error",
+                {
+                    allowProperties: true,
+                },
+            ],
+
+            "no-eval": "error",
+            "no-implied-eval": "error",
+            "no-new-object": "error",
+            "no-new-wrappers": "error",
+            "no-script-url": "error",
+            "no-useless-constructor": "error",
+            "no-useless-rename": "error",
+            "no-var": "error",
+            eqeqeq: "error",
+
+            "object-shorthand": [
+                "error",
+                "always",
+                {
+                    avoidQuotes: true,
+                },
+            ],
+
+            "prefer-const": "error",
+            "import/consistent-type-specifier-style": [
+                "error",
+                "prefer-inline",
+            ],
+            "import/no-unresolved": "off",
+            "import/no-empty-named-blocks": "error",
+
+            "import/no-duplicates": [
+                "error",
+                {
+                    "prefer-inline": true,
+                },
+            ],
+
+            "@typescript-eslint/consistent-type-imports": [
+                "error",
+                {
+                    fixStyle: "inline-type-imports",
+                },
+            ],
+
+            "@typescript-eslint/no-unused-vars": [
+                "error",
+                {
+                    vars: "all",
+                    args: "none",
+                    ignoreRestSiblings: false,
+                },
+            ],
+
+            "@typescript-eslint/prefer-optional-chain": "error",
+            "@typescript-eslint/array-type": "error",
+            "@typescript-eslint/consistent-generic-constructors": "error",
+            "@typescript-eslint/no-duplicate-enum-values": "error",
+            "@typescript-eslint/no-mixed-enums": "error",
+            "@typescript-eslint/no-unsafe-enum-comparison": "error",
+            "@typescript-eslint/no-dynamic-delete": "error",
+            "@typescript-eslint/prefer-nullish-coalescing": "error",
+            "@typescript-eslint/no-non-null-asserted-nullish-coalescing":
+                "error",
+            "@typescript-eslint/no-unnecessary-type-arguments": "error",
+            "@typescript-eslint/non-nullable-type-assertion-style": "error",
+            "@typescript-eslint/prefer-for-of": "error",
+            "@typescript-eslint/prefer-includes": "error",
+            "@typescript-eslint/prefer-return-this-type": "error",
+            "@typescript-eslint/prefer-string-starts-ends-with": "error",
+
+            "@typescript-eslint/require-array-sort-compare": [
+                "error",
+                {
+                    ignoreStringArrays: true,
+                },
+            ],
+
+            "@typescript-eslint/no-explicit-any": "off",
+            "@typescript-eslint/no-inferrable-types": "off",
+            "@typescript-eslint/no-non-null-assertion": "off",
+            "@typescript-eslint/no-unused-vars": "off",
+        },
+    },
+]);