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backend/node_modules/mongoose/eslint.config.mjs

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+import { defineConfig, globalIgnores } from 'eslint/config';
+import mochaNoOnly from 'eslint-plugin-mocha-no-only';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+import js from '@eslint/js';
+
+export default defineConfig([
+  globalIgnores([
+    '**/tools',
+    '**/dist',
+    'test/files/*',
+    '**/benchmarks',
+    '**/*.min.js',
+    '**/docs/js/native.js',
+    '!**/.*',
+    '**/node_modules',
+    '**/.git',
+    '**/data'
+  ]),
+  js.configs.recommended,
+  // general options
+  {
+    languageOptions: {
+      globals: globals.node,
+      ecmaVersion: 2022, // nodejs 18.0.0,
+      sourceType: 'commonjs'
+    },
+    rules: {
+      'comma-style': 'error',
+
+      indent: ['error', 2, {
+        SwitchCase: 1,
+        VariableDeclarator: 2
+      }],
+
+      'keyword-spacing': 'error',
+      'no-whitespace-before-property': 'error',
+      'no-buffer-constructor': 'warn',
+      'no-console': 'off',
+      'no-constant-condition': 'off',
+      'no-multi-spaces': 'error',
+      'func-call-spacing': 'error',
+      'no-trailing-spaces': 'error',
+      'no-undef': 'error',
+      'no-unneeded-ternary': 'error',
+      'no-const-assign': 'error',
+      'no-useless-rename': 'error',
+      'no-dupe-keys': 'error',
+      'space-in-parens': ['error', 'never'],
+
+      'spaced-comment': ['error', 'always', {
+        block: {
+          markers: ['!'],
+          balanced: true
+        }
+      }],
+
+      'key-spacing': ['error', {
+        beforeColon: false,
+        afterColon: true
+      }],
+
+      'comma-spacing': ['error', {
+        before: false,
+        after: true
+      }],
+
+      'array-bracket-spacing': 1,
+
+      'arrow-spacing': ['error', {
+        before: true,
+        after: true
+      }],
+
+      'object-curly-spacing': ['error', 'always'],
+      'comma-dangle': ['error', 'never'],
+      'no-unreachable': 'error',
+      quotes: ['error', 'single'],
+      'quote-props': ['error', 'as-needed'],
+      semi: 'error',
+      'no-extra-semi': 'error',
+      'semi-spacing': 'error',
+      'no-spaced-func': 'error',
+      'no-throw-literal': 'error',
+      'space-before-blocks': 'error',
+      'space-before-function-paren': ['error', 'never'],
+      'space-infix-ops': 'error',
+      'space-unary-ops': 'error',
+      'no-var': 'warn',
+      'prefer-const': 'warn',
+      strict: ['error', 'global'],
+
+      'no-restricted-globals': ['error', {
+        name: 'context',
+        message: 'Don\'t use Mocha\'s global context'
+      }],
+
+      'no-prototype-builtins': 'off',
+      'no-empty': 'off',
+      'eol-last': 'warn',
+
+      'no-multiple-empty-lines': ['warn', {
+        max: 2
+      }]
+    }
+  },
+  // general typescript options
+  {
+    files: ['**/*.{ts,tsx}', '**/*.md/*.ts', '**/*.md/*.typescript'],
+    extends: [
+      tseslint.configs.recommended
+    ],
+    languageOptions: {
+      parserOptions: {
+        projectService: {
+          allowDefaultProject: [],
+          defaultProject: 'tsconfig.json'
+        }
+      }
+    },
+    rules: {
+      '@typescript-eslint/triple-slash-reference': 'off',
+      '@typescript-eslint/no-non-null-assertion': 'off',
+      '@typescript-eslint/no-empty-function': 'off',
+
+      'spaced-comment': ['error', 'always', {
+        block: {
+          markers: ['!'],
+          balanced: true
+        },
+
+        markers: ['/']
+      }],
+
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/ban-types': 'off',
+      '@typescript-eslint/no-unused-vars': 'off',
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+      '@typescript-eslint/prefer-optional-chain': 'error',
+      '@typescript-eslint/no-dupe-class-members': 'error',
+      '@typescript-eslint/no-redeclare': 'error',
+      '@typescript-eslint/space-infix-ops': 'off',
+      '@typescript-eslint/no-require-imports': 'off',
+      '@typescript-eslint/no-empty-object-type': 'off',
+      '@typescript-eslint/no-wrapper-object-types': 'off',
+      '@typescript-eslint/no-unused-expressions': 'off',
+      '@typescript-eslint/no-unsafe-function-type': 'off'
+    }
+  },
+  // type test specific options
+  {
+    files: ['test/types/**/*.ts'],
+    rules: {
+      '@typescript-eslint/no-empty-interface': 'off'
+    }
+  },
+  // test specific options (including type tests)
+  {
+    files: ['test/**/*.js', 'test/**/*.ts'],
+    ignores: ['deno*.mjs'],
+    plugins: {
+      'mocha-no-only': mochaNoOnly
+    },
+    languageOptions: {
+      globals: globals.mocha
+    },
+    rules: {
+      'no-self-assign': 'off',
+      'mocha-no-only/mocha-no-only': ['error']
+    }
+  },
+  // deno specific options
+  {
+    files: ['**/deno*.mjs'],
+    languageOptions: {
+      globals: {
+        // "globals" currently has no definition for deno
+        Deno: 'readonly'
+      }
+    }
+  },
+  // general options for module files
+  {
+    files: ['**/*.mjs'],
+    languageOptions: {
+      sourceType: 'module'
+    }
+  },
+  // doc script specific options
+  {
+    files: ['**/docs/js/**/*.js'],
+    languageOptions: {
+      globals: {
+        ...Object.fromEntries(Object.entries(globals.node).map(([key]) => [key, 'off'])),
+        ...globals.browser }
+    }
+  }
+]);