add eslint config

Author: Clinton Werth

web-app/eslint.config.mjs

@@ -0,0 +1,53 @@
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import js from "@eslint/js";
+import { FlatCompat } from "@eslint/eslintrc";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+    baseDirectory: __dirname,
+    recommendedConfig: js.configs.recommended,
+    allConfig: js.configs.all
+});
+
+export default [...compat.extends(
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:@angular-eslint/recommended",
+).map(config => ({
+    ...config,
+    files: ["**/*.ts"],
+})), {
+    files: ["**/*.ts"],
+
+    languageOptions: {
+        ecmaVersion: 5,
+        sourceType: "script",
+
+        parserOptions: {
+            project: ["tsconfig.app.json", "tsconfig.spec.json"],
+            createDefaultProgram: true,
+        },
+    },
+
+    rules: {
+        "@angular-eslint/directive-selector": ["error", {
+            type: "attribute",
+            prefix: "app",
+            style: "camelCase",
+        }],
+
+        "@angular-eslint/component-selector": ["error", {
+            type: "element",
+            prefix: "app",
+            style: "kebab-case",
+        }],
+    },
+}, ...compat.extends("plugin:@angular-eslint/template/recommended").map(config => ({
+    ...config,
+    files: ["**/*.html"],
+})), {
+    files: ["**/*.html"],
+    rules: {},
+}];