feat(eslint): add eslint flat config

eslint.config.ts

@@ -0,0 +1,93 @@
+import { includeIgnoreFile } from "@eslint/compat";
+import type { TSESLint } from "@typescript-eslint/utils";
+import prettierConfig from "eslint-config-prettier";
+import astro from "eslint-plugin-astro";
+import { dirname, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+import tseslint from "typescript-eslint";
+
+// Import modular configurations
+import { astroConfig } from "./.eslint/astro";
+import { baseConfig } from "./.eslint/base";
+import { configFilesConfig } from "./.eslint/config-files";
+import { importConfigArray } from "./.eslint/import";
+import { javascriptConfig } from "./.eslint/javascript";
+import { jsxA11yConfig } from "./.eslint/jsx-a11y";
+import { reactConfig, reactHooksConfig } from "./.eslint/react";
+import { testConfig } from "./.eslint/test";
+import { createTypescriptConfig } from "./.eslint/typescript";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const tsConfigPath = resolve(__dirname, "./tsconfig.json");
+
+const ignoresConfig = {
+  name: "eslint/ignores",
+  ignores: [
+    // Build outputs
+    "**/dist/**",
+    "**/build/**",
+    "**/.astro/**",
+    "**/node_modules/**",
+
+    // Test outputs
+    "**/coverage/**",
+    "**/playwright-report/**",
+    "**/test-results/**",
+
+    // Config files that don't need linting
+    "**/*.config.js",
+    "**/*.config.mjs",
+    "**/wrangler.toml",
+
+    // Other common ignores
+    "**/.next/**",
+    "**/.nuxt/**",
+    "**/.output/**",
+    "**/.vercel/**",
+    "**/.netlify/**",
+    "**/public/**",
+    "**/*.min.js",
+    "**/*.d.ts",
+    "**/CHANGELOG.md",
+    "**/README.md",
+  ],
+} satisfies TSESLint.FlatConfig.Config;
+
+const config: TSESLint.FlatConfig.ConfigArray = tseslint.config(
+  // Include .gitignore patterns
+  includeIgnoreFile(resolve(__dirname, ".gitignore")),
+
+  // Core configurations
+  ignoresConfig,
+  baseConfig,
+  // TypeScript ecosystem
+  ...tseslint.configs.strict,
+  ...tseslint.configs.stylistic,
+  createTypescriptConfig(tsConfigPath),
+
+  // Import management
+  ...importConfigArray,
+
+  // Framework specific
+  reactConfig,
+  reactHooksConfig,
+  jsxA11yConfig,
+
+  // Astro specific
+  ...astro.configs.recommended,
+  astroConfig,
+
+  // Language specific
+  javascriptConfig,
+
+  // Special cases
+  testConfig,
+  configFilesConfig,
+
+  // Prettier integration (must be last)
+  prettierConfig,
+);
+
+export default config;