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functions/eslint.config.mjs

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+import path from 'path';
+import { fileURLToPath } from 'url';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+import tsParser from '@typescript-eslint/parser'; // TS parser
+import js from '@eslint/js';
+import { defineConfig } from 'eslint/config';
+import eslintConfigPrettier from 'eslint-config-prettier';
+
+import importPlugin from 'eslint-plugin-import';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+export default defineConfig([
+  js.configs.recommended,
+  tseslint.configs.recommended,
+  importPlugin.flatConfigs.recommended,
+  importPlugin.flatConfigs.errors,
+  importPlugin.flatConfigs.warnings,
+  importPlugin.flatConfigs.typescript,
+  eslintConfigPrettier,
+  { ignores: ['node_modules', 'dist', 'public', 'lib'] },
+  {
+    files: ['**/*.{js,mjs,cjs,ts,tsx}'],
+    languageOptions: {
+      parser: tsParser,
+      parserOptions: {
+        ecmaFeatures: { jsx: true },
+        ecmaVersion: 'latest',
+        sourceType: 'module',
+        project: ['tsconfig.json', 'tsconfig.dev.json'],
+        tsconfigRootDir: __dirname,
+      },
+      globals: globals.node,
+    },
+    rules: {
+      '@typescript-eslint/no-unused-vars': 'warn',
+      '@typescript-eslint/no-var-requires': 'error',
+      '@typescript-eslint/strict-boolean-expressions': 'off',
+
+      'import/no-unresolved': 0,
+    },
+  },
+  eslintConfigPrettier,
+]);