chore: migrate eslint to flat config (#1926)

angular.json

@@ -31,15 +31,6 @@
             "styles": [],
             "scripts": []
           }
-        },
-        "lint": {
-          "builder": "@angular-eslint/builder:lint",
-          "options": {
-            "lintFilePatterns": [
-              "projects/ngx-quill/**/*.ts",
-              "projects/ngx-quill/**/*.html"
-            ]
-          }
         }
       }
     }

eslint.config.mjs

@@ -0,0 +1,94 @@
+// @ts-check
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+import { includeIgnoreFile } from '@eslint/compat'
+
+import angular from 'angular-eslint'
+import tseslint from 'typescript-eslint'
+import stylistic from '@stylistic/eslint-plugin'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename)
+const gitignorePath = path.resolve(__dirname, '.gitignore')
+
+export default tseslint.config(
+  includeIgnoreFile(gitignorePath),
+
+  {
+    name: 'tsc options',
+    files: ['**/*.ts'],
+    languageOptions: {
+      parser: tseslint.parser,
+      parserOptions: {
+        project: ['tsconfig.json', 'e2e/tsconfig.json'],
+        tsconfigRootDir: __dirname,
+      },
+    },
+  },
+
+  {
+    name: 'angular ts recommended rules',
+    files: ['**/*.ts'],
+    plugins: {
+      '@stylistic': stylistic,
+    },
+    extends: [
+      ...tseslint.configs.recommended,
+      ...tseslint.configs.stylistic,
+      ...angular.configs.tsRecommended,
+    ],
+    rules: {
+      '@angular-eslint/no-output-on-prefix': 'off',
+
+      '@stylistic/no-multiple-empty-lines': [
+        'error',
+        {
+          max: 1,
+          maxBOF: 0,
+          maxEOF: 1,
+        },
+      ],
+      '@stylistic/semi': ['error', 'never'],
+      '@stylistic/member-delimiter-style': [
+        'error',
+        {
+          multiline: {
+            delimiter: 'none',
+            requireLast: true,
+          },
+          singleline: {
+            delimiter: 'semi',
+            requireLast: false,
+          },
+          multilineDetection: 'brackets',
+        },
+      ],
+
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-non-null-assertion': 'off',
+      '@typescript-eslint/naming-convention': [
+        'error',
+        {
+          selector: 'parameter',
+          format: ['camelCase'],
+          filter: {
+            regex: '^Quill$',
+            match: false,
+          },
+        },
+      ],
+    },
+  },
+
+  {
+    name: 'angular template recommended rules',
+    files: ['**/*.html'],
+    extends: [
+      ...angular.configs.templateRecommended,
+      ...angular.configs.templateAccessibility,
+    ],
+    rules: {
+      '@angular-eslint/template/no-negated-async': 'off',
+    },
+  },
+)