From 126c6f4884e1b2e650d974107884994f31e5deb7 Mon Sep 17 00:00:00 2001
From: Eric Rumsey <ehrumsey@gmail.com>
Date: Fri, 23 May 2025 17:36:54 -0500
Subject: [PATCH] Configure linting for functional programming

---
 eslint.config.js | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/eslint.config.js b/eslint.config.js
index 34e9b0f..7198767 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -1,17 +1,21 @@
-import js from "@eslint/js";
-import globals from "globals";
-import tseslint from "typescript-eslint";
-import { defineConfig } from "eslint/config";
-import eslintConfigPrettier from "eslint-config-prettier/flat";
+import fp from 'eslint-plugin-fp';
+import js from '@eslint/js';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+import { defineConfig } from 'eslint/config';
+import eslintConfigPrettier from 'eslint-config-prettier/flat';
 
 export default defineConfig([
   {
-    files: ["**/*.{js,mjs,cjs,ts}"],
-    plugins: { js },
-    extends: ["js/recommended"],
+    files: ['**/*.{js,mjs,cjs,ts}'],
+    plugins: { js, fp },
+    extends: ['js/recommended'],
+    rules: {
+      'fp/no-mutation': 'error',
+    },
   },
   {
-    files: ["**/*.{js,mjs,cjs,ts}"],
+    files: ['**/*.{js,mjs,cjs,ts}'],
     languageOptions: { globals: globals.browser },
   },
   tseslint.configs.recommended,