Upgrade ESLint, rework config, split out Prettier

.github/workflows/test-javascript.yml

@@ -36,5 +36,5 @@ jobs:
         cache-dependency-path: javascript/package-lock.json
     - run: npm install-test
       working-directory: javascript
-    - run: npm run eslint
+    - run: npm run lint
       working-directory: javascript

javascript/eslint.config.mjs

@@ -0,0 +1,70 @@
+import { fixupConfigRules, fixupPluginRules } from "@eslint/compat";
+import _import from "eslint-plugin-import";
+import simpleImportSort from "eslint-plugin-simple-import-sort";
+import n from "eslint-plugin-n";
+import typescriptEslint from "@typescript-eslint/eslint-plugin";
+import globals from "globals";
+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 [...fixupConfigRules(compat.extends(
+    "eslint:recommended",
+    "plugin:import/typescript",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:@typescript-eslint/recommended",
+)), {
+    plugins: {
+        import: fixupPluginRules(_import),
+        "simple-import-sort": simpleImportSort,
+        n,
+        "@typescript-eslint": fixupPluginRules(typescriptEslint),
+    },
+
+    languageOptions: {
+        globals: {
+            ...globals.browser,
+            ...globals.node,
+        },
+
+        parser: tsParser,
+        ecmaVersion: 5,
+        sourceType: "module",
+
+        parserOptions: {
+            project: "tsconfig.json",
+        },
+    },
+
+    rules: {
+        "import/no-cycle": "error",
+        "n/no-extraneous-import": "error",
+        "@typescript-eslint/ban-ts-ignore": "off",
+        "@typescript-eslint/ban-ts-comment": "off",
+        "@typescript-eslint/explicit-module-boundary-types": "off",
+        "@typescript-eslint/explicit-function-return-type": "off",
+        "@typescript-eslint/no-use-before-define": "off",
+        "@typescript-eslint/interface-name-prefix": "off",
+        "@typescript-eslint/member-delimiter-style": "off",
+        "@typescript-eslint/no-explicit-any": "error",
+        "@typescript-eslint/no-non-null-assertion": "error",
+        "simple-import-sort/imports": "error",
+        "simple-import-sort/exports": "error",
+    },
+}, {
+    files: ["test/**"],
+
+    rules: {
+        "@typescript-eslint/no-non-null-assertion": "off",
+    },
+}];