chore: add ESLint setup

Author: nschonni

.github/workflows/lint-javascript.yml

@@ -0,0 +1,28 @@
+name: Check JavaScript formatting
+
+on:
+  pull_request:
+    paths:
+      - '**/*.{js,mjs,cjs}'
+      - 'package*.json'
+      - .github/workflows/lint-javascript.yml
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  eslint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Set up Node.js
+        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
+        with:
+          node-version-file: .node-version
+          cache: npm
+      - name: Install dependencies
+        run: npm ci
+      - name: Run ESLint
+        run: npm run format:javascript:check

CONTRIBUTING.md

@@ -90,12 +90,14 @@ npm run lint:fix
 
 Alternatively use any of the following commands to call one of the underlying linting utilities:
 
-| Command                         | Purpose                                 |
-| ------------------------------- | --------------------------------------- |
-| `npm run format:toc`            | Reformats any Table of Contents         |
-| `npm run format:toc:check`      | Read-only Table of Contents check       |
-| `npm run format:prettier`       | Reformats multiple types of source code |
-| `npm run format:prettier:check` | Read-only prettier check                |
+| Command                           | Purpose                                 |
+| --------------------------------- | --------------------------------------- |
+| `npm run format:toc`              | Reformats any Table of Contents         |
+| `npm run format:toc:check`        | Read-only Table of Contents check       |
+| `npm run format:prettier`         | Reformats multiple types of source code |
+| `npm run format:prettier:check`   | Read-only prettier check                |
+| `npm run format:javascript        | Reformats JavaScript source code        |
+| `npm run format:javascript:check` | Read-only ESLint check                  |
 
 ## Link checks
 

build-automation.mjs

@@ -50,6 +50,7 @@ const checkIfThereAreNewVersions = async (github) => {
       if (latestSupportedVersions[availableMajor] == null) {
         continue;
       }
+      // eslint-disable-next-line no-unused-vars
       const [_latestMajor, latestMinor, latestPatch] =
         latestSupportedVersions[availableMajor].fullVersion.split('.');
       if (

eslint.config.mjs

@@ -0,0 +1,12 @@
+import js from '@eslint/js';
+import globals from 'globals';
+import { defineConfig } from 'eslint/config';
+
+export default defineConfig([
+  {
+    files: ['**/*.{js,mjs,cjs}'],
+    plugins: { js },
+    extends: ['js/recommended'],
+    languageOptions: { globals: globals.node },
+  },
+]);