test: added JavaScript Lint into CI.

.github/workflows/javascript-lint.yml

@@ -0,0 +1,25 @@
+name: JavaScript Lint
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: npm
+      - run: npm ci
+      - run: npm run lint:js

.gitignore

@@ -7,3 +7,5 @@ __pychache__/
 .idea/
 .vscode/
 .DS_Store
+
+node_modules/  # Node tooling (JS lint/format).

.prettierrc.json

@@ -0,0 +1,3 @@
+{
+  "singleQuote": true
+}

README.md

@@ -12,12 +12,15 @@
 [![macOS](https://img.shields.io/badge/macOS-A2AAAD?style=for-the-badge&logo=apple&logoColor=black)](https://www.jack-s-onlineblackjack.com)
 [![Windows](https://img.shields.io/badge/Windows-0078D4?style=for-the-badge&logo=windows&logoColor=white)](https://www.jack-s-onlineblackjack.com)
 
+---
+
 ### 🛰️ Metadata
 
 [![main Unit Tests](https://github.com/StarsExpress/MonkeyJOB/actions/workflows/unit_tests.yml/badge.svg?branch=main)](https://github.com/StarsExpress/MonkeyJOB/actions)
 [![main Component Tests](https://github.com/StarsExpress/MonkeyJOB/actions/workflows/component_tests.yml/badge.svg?branch=main)](https://github.com/StarsExpress/MonkeyJOB/actions)
 [![main Integration Tests](https://github.com/StarsExpress/MonkeyJOB/actions/workflows/integration_tests.yml/badge.svg?branch=main)](https://github.com/StarsExpress/MonkeyJOB/actions)
 [![main Black Lint](https://github.com/StarsExpress/MonkeyJOB/actions/workflows/black-lint.yml/badge.svg?branch=main)](https://github.com/StarsExpress/MonkeyJOB/actions)
+[![main JavaScript Lint](https://github.com/StarsExpress/MonkeyJOB/actions/workflows/javascript-lint.yml/badge.svg?branch=main)](https://github.com/StarsExpress/MonkeyJOB/actions)
 [![Latest Release](https://img.shields.io/github/v/release/StarsExpress/MonkeyJOB)](https://github.com/StarsExpress/MonkeyJOB/releases)
 
 ---

eslint.config.mjs

@@ -0,0 +1,17 @@
+import js from "@eslint/js";
+import globals from "globals";
+import prettier from "eslint-config-prettier";
+
+export default [
+  js.configs.recommended,
+  {
+    files: ["static/**/*.js"],
+    languageOptions: {
+      ecmaVersion: 2022,
+      sourceType: "script",
+      globals: { ...globals.browser },
+    },
+  },
+  // Last: turns off ESLint rules that conflict with Prettier's formatting.
+  prettier,
+];