From 43b634b7c14406c64ce8279d2cdd9a9a777f0b16 Mon Sep 17 00:00:00 2001
From: Popie <86546258+Popie52@users.noreply.github.com>
Date: Sat, 6 Dec 2025 12:18:03 +0530
Subject: [PATCH 1/3] refactor: migrate to Node16 module resolution and ESLint
 flat config
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Updated TypeScript and ESLint setup to remove deprecated configuration fields.

- Migrated from `moduleResolution: "node"` → `moduleResolution: "node16"`.
- Set `module: "node16"` to satisfy TS 5+ validation rules.
- Replaced deprecated `tseslint.config()` usage with the recommended flat config export.
- Modernized ESLint parser options and config structure.
- Ensures compatibility with latest TypeScript, ESLint, and typescript-eslint releases.

This improves maintainability, resolves deprecation warnings, and aligns the repository with current ecosystem standards.
---
 src/content/9/en/part9b.md | 106 ++++++++++++++++++++++---------------
 1 file changed, 63 insertions(+), 43 deletions(-)

diff --git a/src/content/9/en/part9b.md b/src/content/9/en/part9b.md
index ad95b4e357..f3982dc96c 100644
--- a/src/content/9/en/part9b.md
+++ b/src/content/9/en/part9b.md
@@ -733,7 +733,7 @@ This is because we banned unused parameters in our *tsconfig.json*:
     "noFallthroughCasesInSwitch": true,
     "noImplicitAny": true,
     "esModuleInterop": true,
-    "moduleResolution": "node"
+    "moduleResolution": "node16"
   }
 }
 ```
@@ -907,22 +907,32 @@ We will configure ESlint to [disallow explicit any](https://github.com/typescrip
 import eslint from '@eslint/js';
 import tseslint from 'typescript-eslint';
 
-export default tseslint.config({
-  files: ['**/*.ts'],
-  extends: [
-    eslint.configs.recommended,
-    ...tseslint.configs.recommendedTypeChecked,
-  ],
-  languageOptions: {
-    parserOptions: {
-      project: true,
-      tsconfigRootDir: import.meta.dirname,
-    },
+export default [
+  {
+    ignores: ["dist/**", "build/**", "eslint.config.*", "**/*.js", "**/*.mjs"],
   },
-  rules: {
-    '@typescript-eslint/no-explicit-any': 'error',
+  {
+    files: ["**/*.ts"],
   },
-});
+
+  // Base ESLint recommended rules
+  eslint.configs.recommended,
+
+  // TypeScript ESLint rules (type-aware)
+  ...tseslint.configs.recommendedTypeChecked,
+
+  {
+    languageOptions: {
+      parserOptions: {
+        project: true, // looks for tsconfig.json automatically
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+    rules: {
+      "@typescript-eslint/no-explicit-any": "error",
+    },
+  },
+];
 ```
 
 Let us also set up a *lint* npm script to inspect the files by modifying the *package.json* file:
@@ -955,39 +965,49 @@ npm install --save-dev @stylistic/eslint-plugin
 Our final *eslint.config.mjs* looks as follows:
 
 ```js
-import eslint from '@eslint/js';
-import tseslint from 'typescript-eslint';
+import eslint from "@eslint/js";
+import tseslint from "typescript-eslint";
 import stylistic from "@stylistic/eslint-plugin";
 
-export default tseslint.config({
-  files: ['**/*.ts'],
-  extends: [
-    eslint.configs.recommended,
-    ...tseslint.configs.recommendedTypeChecked,
-  ],
-  languageOptions: {
-    parserOptions: {
-      project: true,
-      tsconfigRootDir: import.meta.dirname,
-    },
+export default [
+  {
+    ignores: ["dist/**", "build/**", "eslint.config.*", "**/*.js", "**/*.mjs"],
   },
-  plugins: {
-    "@stylistic": stylistic,
+  {
+    files: ["**/*.ts"],
   },
-  rules: {
-    '@stylistic/semi': 'error',
-    '@typescript-eslint/no-unsafe-assignment': 'error',
-    '@typescript-eslint/no-explicit-any': 'error',
-    '@typescript-eslint/explicit-function-return-type': 'off',
-    '@typescript-eslint/explicit-module-boundary-types': 'off',
-    '@typescript-eslint/restrict-template-expressions': 'off',
-    '@typescript-eslint/restrict-plus-operands': 'off',
-    '@typescript-eslint/no-unused-vars': [
-      'error',
-      { 'argsIgnorePattern': '^_' }
-    ],
+
+  // Base ESLint recommended rules
+  eslint.configs.recommended,
+
+  // TypeScript ESLint rules (type-aware)
+  ...tseslint.configs.recommendedTypeChecked,
+
+  {
+    languageOptions: {
+      parserOptions: {
+        project: true, // looks for tsconfig.json automatically
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+    plugins: {
+      "@stylistic": stylistic,
+    },
+    rules: {
+      "@stylistic/semi": "error",
+      //   "@typescript-eslint/no-unsafe-assignment": "error",
+    //   "@typescript-eslint/no-explicit-any": "error",
+      "@typescript-eslint/explicit-function-return-type": "off",
+      "@typescript-eslint/explicit-module-boundary-types": "off",
+      "@typescript-eslint/restrict-template-expressions": "off",
+      "@typescript-eslint/restrict-plus-operands": "off",
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        { argsIgnorePattern: "^_" },
+      ],
+    },
   },
-});
+];
 ```
 
 Quite a few semicolons are missing, but those are easy to add. We also have to solve the ESlint issues concerning the *any* type:

From 7e9f001bb97cbe351ca215e1c045357ff0e1951a Mon Sep 17 00:00:00 2001
From: Popie <86546258+Popie52@users.noreply.github.com>
Date: Sat, 6 Dec 2025 12:25:23 +0530
Subject: [PATCH 2/3] Part 9b: refactor: migrate to Node16 module resolution
 and ESLint flat config
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Updated TypeScript and ESLint setup to remove deprecated configuration fields.

- Migrated from `moduleResolution: "node"` → `moduleResolution: "node16"`.
- Set `module: "node16"` to satisfy TS 5+ validation rules.
- Replaced deprecated `tseslint.config()` usage with the recommended flat config export.
- Modernized ESLint parser options and config structure.
- Ensures compatibility with latest TypeScript, ESLint, and typescript-eslint releases.

This improves maintainability, resolves deprecation warnings, and aligns the repository with current ecosystem standards.
---
 src/content/9/en/part9b.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/content/9/en/part9b.md b/src/content/9/en/part9b.md
index f3982dc96c..3a304c3634 100644
--- a/src/content/9/en/part9b.md
+++ b/src/content/9/en/part9b.md
@@ -622,7 +622,8 @@ Let's specify the following configuration in our *tsconfig.json* file:
     "noFallthroughCasesInSwitch": true,
     "noImplicitAny": true, // highlight-line
     "esModuleInterop": true,
-    "moduleResolution": "node"
+    "module": "node16",
+    "moduleResolution": "node16"
   }
 }
 ```
@@ -733,6 +734,7 @@ This is because we banned unused parameters in our *tsconfig.json*:
     "noFallthroughCasesInSwitch": true,
     "noImplicitAny": true,
     "esModuleInterop": true,
+    "module": "node16",
     "moduleResolution": "node16"
   }
 }

From 4a858a3dae3966a633a56c062d11f2fdfc157b20 Mon Sep 17 00:00:00 2001
From: Popie <86546258+Popie52@users.noreply.github.com>
Date: Sat, 6 Dec 2025 12:37:08 +0530
Subject: [PATCH 3/3] Uncomment TypeScript ESLint rules

---
 src/content/9/en/part9b.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/content/9/en/part9b.md b/src/content/9/en/part9b.md
index 3a304c3634..b3f226ea94 100644
--- a/src/content/9/en/part9b.md
+++ b/src/content/9/en/part9b.md
@@ -997,8 +997,8 @@ export default [
     },
     rules: {
       "@stylistic/semi": "error",
-      //   "@typescript-eslint/no-unsafe-assignment": "error",
-    //   "@typescript-eslint/no-explicit-any": "error",
+      "@typescript-eslint/no-unsafe-assignment": "error",
+      "@typescript-eslint/no-explicit-any": "error",
       "@typescript-eslint/explicit-function-return-type": "off",
       "@typescript-eslint/explicit-module-boundary-types": "off",
       "@typescript-eslint/restrict-template-expressions": "off",