fix: support @nuxtjs/robots v4 merge

.playground/nuxt.config.ts

@@ -2,12 +2,12 @@ import { resolve } from 'node:path'
 import { defineNuxtConfig } from 'nuxt/config'
 import { defineNuxtModule } from '@nuxt/kit'
 import { startSubprocess } from '@nuxt/devtools-kit'
-import NuxtSimpleSitemap from '../src/module'
+import NuxtSitemap from '../src/module'
 
 export default defineNuxtConfig({
   modules: [
-    NuxtSimpleSitemap,
-    'nuxt-simple-robots',
+    NuxtSitemap,
+    '@nuxtjs/robots',
     '@nuxtjs/i18n',
     '@nuxt/content',
     '@nuxt/ui',

.playground/pages/blocked-by-robots-txt/foo.vue

@@ -1,3 +1,3 @@
 <template>
-  <div>This should be blocked by nuxt-simple-robots integration automatically.</div>
+  <div>This should be blocked by @nuxtjs/robots integration automatically.</div>
 </template>

package.json

@@ -83,7 +83,7 @@
     "execa": "^9.3.0",
     "nuxt": "^3.12.3",
     "nuxt-icon": "1.0.0-beta.7",
-    "nuxt-simple-robots": "4.0.0-rc.20",
+    "@nuxtjs/robots": "4.0.0-rc.22",
     "typescript": "5.4.5",
     "vitest": "^2.0.2"
   },

src/module.ts

@@ -237,19 +237,20 @@ export default defineNuxtModule<ModuleOptions>({
     }
 
     let needsRobotsPolyfill = true
-    if (hasNuxtModule('nuxt-simple-robots')) {
-      const robotsVersion = await getNuxtModuleVersion('nuxt-simple-robots')
+    const robotsModuleName = hasNuxtModule('nuxt-simple-robots') ? 'nuxt-simple-robots' : hasNuxtModule('@nuxtjs/robots') ? '@nuxtjs/robots' : false
+    if (robotsModuleName) {
+      const robotsVersion = await getNuxtModuleVersion(robotsModuleName)
       // we want to keep versions in sync
-      if (!await hasNuxtModuleCompatibility('nuxt-simple-robots', '>=4'))
-        logger.warn(`You are using nuxt-simple-robots v${robotsVersion}. For the best compatibility, please upgrade to nuxt-simple-robots v4.0.0 or higher.`)
+      if (!await hasNuxtModuleCompatibility(robotsModuleName, '>=4'))
+        logger.warn(`You are using ${robotsModuleName} v${robotsVersion}. For the best compatibility, please upgrade to ${robotsModuleName} v4.0.0 or higher.`)
       else
         needsRobotsPolyfill = false
       // @ts-expect-error untyped
       nuxt.hooks.hook('robots:config', (robotsConfig) => {
         robotsConfig.sitemap.push(usingMultiSitemaps ? '/sitemap_index.xml' : `/${config.sitemapName}`)
       })
     }
-    // this is added in v4 of Nuxt Simple Robots
+    // this is added in v4 of Nuxt Robots
     if (needsRobotsPolyfill) {
       addServerImports([{
         name: 'getPathRobotConfigPolyfill',