Update eslint, fix linting issues and upgrade dependencies

.github/workflows/lint.yml

@@ -0,0 +1,23 @@
+name: Lint
+
+on:
+  pull_request: {}
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint

eslint.config.mjs

@@ -0,0 +1,47 @@
+import eslintConfig from '@pretendonetwork/eslint-config';
+import globals from 'globals';
+
+export default [
+	...eslintConfig,
+	{
+		// Allow browser globals in webfiles
+		languageOptions: {
+			globals: {
+				...globals.browser,
+				Pjax: false // loaded from pjax.min.js
+			}
+		},
+		files: ['src/webfiles/**/*.js']
+	},
+	{
+		// Rules that apply to the 3DS (CTR) and Wii U (Portal) browsers
+		files: ['src/webfiles/ctr/**/*.js', 'src/webfiles/portal/**/*.js'],
+		rules: {
+			'no-var': 'off' // 3DS and Wii U browsers need to use var
+		},
+		languageOptions: {
+			globals: {
+				...globals.browser,
+				wiiuBrowser: 'readonly',
+				wiiuSound: 'readonly',
+				wiiuMainApplication: 'readonly',
+				wiiuErrorViewer: 'readonly',
+				wiiuMemo: 'readonly',
+				wiiuDialog: 'readonly',
+				wiiu: 'readonly',
+				cave: 'readonly',
+				Olv: 'readonly'
+			}
+		}
+	},
+	{
+		// Add node.js globals to files outside of the webfiles directory
+		languageOptions: {
+			globals: {
+				...globals.node,
+				...globals.builtin
+			}
+		},
+		ignores: ['src/webfiles/**/*.js']
+	}
+];