Update npm packages, apply new eslint config and fixes

.github/workflows/ci.yml

@@ -13,21 +13,21 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-node@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
         with:
-          node-version: 18.18
+          node-version: 20
       - run: npm ci --prefer-offline --no-audit --no-save
       - run: npm run lint
 
   test:
     needs: lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-node@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
         with:
-          node-version: 18.18 # https://github.com/privatenumber/tsx/issues/354
+          node-version: 20
       - run: npm ci --prefer-offline --no-audit --no-save
       - run: npm run build
       - run: npm run install:examples

eslint.config.mjs

@@ -0,0 +1,35 @@
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+	eslint.configs.recommended,
+	...tseslint.configs.recommendedTypeChecked,
+	...tseslint.configs.stylisticTypeChecked,
+	{
+		languageOptions: {
+			parserOptions: {
+				ecmaVersion: 5,
+				projectService: true,
+			}
+		},
+		rules: {
+			"@typescript-eslint/consistent-type-assertions": ["error", { assertionStyle: "angle-bracket" }],
+			"@typescript-eslint/prefer-nullish-coalescing": "off",
+			"@typescript-eslint/prefer-optional-chain": "off",
+    		"@typescript-eslint/no-inferrable-types": "warn",
+			"@typescript-eslint/no-unnecessary-condition": "warn",
+			"@typescript-eslint/no-unsafe-enum-comparison": "off",
+			"@typescript-eslint/restrict-template-expressions": ["warn", { allowArray: true, allowBoolean: true, allowNullish: true, allowNumber: true }],
+    		"@typescript-eslint/triple-slash-reference": "off",
+		}
+	},
+	{
+		ignores: [
+			"**/dist/**",
+			"**/lib/**",
+			"**/tests/**",
+			"**/rollup.config.js",
+			"eslint.config.mjs"
+		]
+	}
+);