feat: add Astro support

Author: aminya

src/astro.cts

@@ -0,0 +1,11 @@
+export const astroConfig = {
+  // astro files
+  files: ["*.astro"],
+  parser: "astro-eslint-parser",
+  parserOptions: {
+    parser: "@typescript-eslint/parser",
+    extraFileExtensions: [".astro"],
+  },
+  plugins: ["astro", "only-warn"],
+  extends: ["plugin:astro/recommended"],
+}

src/index.cts

@@ -8,6 +8,7 @@ import { htmlConfig } from "./html.cjs"
 import { pluginImportSettings } from "./plugin-import-rules.cjs"
 import semverMajor from "semver/functions/major"
 import { getEslintVersion } from "./eslint-version.cjs"
+import { astroConfig } from "./astro.cjs"
 
 function maybeAddCoffeeScript() {
   try {
@@ -38,7 +39,7 @@ const config = {
     measure: "readonly",
   },
   ...jsConfig,
-  overrides: [tsConfig, jsonConfig, yamlConfig, htmlConfig, ...maybeAddCoffeeScript()],
+  overrides: [tsConfig, jsonConfig, yamlConfig, htmlConfig, astroConfig, ...maybeAddCoffeeScript()],
   settings: {
     ...pluginImportSettings,
   },