Standardize license headers and fix ESLint config

eslint.config.mjs

@@ -19,6 +19,7 @@ import angularTemplate from '@angular-eslint/template-parser';
 import angularTemplatePlugin from '@angular-eslint/eslint-plugin-template';
 import typescriptEslintPlugin from '@typescript-eslint/eslint-plugin';
 import typescriptParser from '@typescript-eslint/parser';
+import headers from 'eslint-plugin-headers';
 import eslintConfigPrettier from 'eslint-config-prettier';
 import importPlugin from 'eslint-plugin-import';
 import nodePlugin from 'eslint-plugin-n';
@@ -51,10 +52,12 @@ export default [
     return newConfig;
   }),
   {
+    files: ['**/*.ts', '**/*.js'],
     plugins: {
       '@typescript-eslint': typescriptEslintPlugin,
       n: nodePlugin,
       'unused-imports': unusedImports,
+      headers,
     },
     languageOptions: {
       globals: {
@@ -104,6 +107,34 @@ export default [
           varsIgnorePattern: '^_',
         },
       ],
+      'headers/header-format': [
+        'warn',
+        {
+          source: 'string',
+          content: `Copyright (year) {company}.
+
+Licensed under the Apache License, Version 2.0 (the 'License');
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    https://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an 'AS IS' BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.`,
+          variables: {
+            company: 'The Ground Authors',
+          },
+          patterns: {
+            year: {
+              pattern: '\\d{4}',
+              defaultValue: '2026',
+            },
+          },
+        },
+      ],
     },
   },
   {

package.json

@@ -13,7 +13,8 @@
         "dependsOn": [
           {
             "target": "lint",
-            "projects": "*"
+            "projects": "*",
+            "params": "forward"
           }
         ]
       },
@@ -116,17 +117,18 @@
   },
   "homepage": "https://groundplatform.org",
   "devDependencies": {
-    "@angular/cli": "catalog:dev",
     "@angular-eslint/builder": "catalog:dev",
     "@angular-eslint/eslint-plugin": "catalog:dev",
     "@angular-eslint/eslint-plugin-template": "catalog:dev",
     "@angular-eslint/template-parser": "catalog:dev",
+    "@angular/cli": "catalog:dev",
     "@eslint/eslintrc": "catalog:dev",
     "@types/jasmine": "catalog:dev",
     "@typescript-eslint/eslint-plugin": "catalog:dev",
     "@typescript-eslint/parser": "catalog:dev",
     "eslint": "catalog:dev",
     "eslint-config-prettier": "catalog:dev",
+    "eslint-plugin-headers": "catalog:dev",
     "eslint-plugin-import": "catalog:dev",
     "eslint-plugin-n": "catalog:dev",
     "eslint-plugin-unused-imports": "catalog:dev",