feat: composables useNuxtDevTools (nuxt#383)

docs/content/1.guide/2.composables.md

@@ -0,0 +1,28 @@
+# Composables
+
+In case you might want to open or control the Nuxt DevTools in your application on development, a composable `useNuxtDevtools` is registered with auto-import.
+
+```vue
+<script setup>
+// Returns undefined in production mode or when the DevTools are not enabled
+const devtoolsClient = useNuxtDevtools() // NuxtDevToolsHostClient | undefined
+</script>
+
+<template>
+  <button
+    v-if="devtoolsClient"
+    @click="devtoolsClient.devtools.navigate('/modules/components')"
+  >
+    <!-- Open the DevTools and navigate to the components tab -->
+    Open DevTools
+  </button>
+</template>
+```
+
+When you have auto-import disabled, you can also import it explicitly:
+
+```ts
+import { useNuxtDevtools } from '#imports'
+```
+
+Checkout it's type definition for more available methods.

packages/devtools/src/module-main.ts

@@ -88,6 +88,13 @@ window.__NUXT_DEVTOOLS_TIME_METRIC__.appInit = Date.now()
     config.server.watch.ignored.push('**/.nuxt/analyze/**')
   })
 
+  nuxt.hook('imports:extend', (imports) => {
+    imports.push({
+      name: 'useNuxtDevTools',
+      from: join(runtimeDir, 'use-nuxt-devtools'),
+    })
+  })
+
   // TODO: Use WS from nitro server when possible
   nuxt.hook('vite:serverCreated', (server: ViteDevServer) => {
     server.middlewares.use(ROUTE_ANALYZE, sirv(analyzeDir, { single: false, dev: true }))

packages/devtools/src/runtime/plugins/view/client.ts

@@ -102,6 +102,8 @@ export async function setupDevToolsClient({
     },
   })
 
+  window.__NUXT_DEVTOOLS_HOST__ = client
+
   let iframe: HTMLIFrameElement | undefined
 
   function syncClient() {

packages/devtools/src/runtime/use-nuxt-devtools.ts

@@ -0,0 +1,34 @@
+import type { Ref } from 'vue'
+import { shallowRef } from 'vue'
+import type { NuxtDevtoolsHostClient } from '../types'
+
+/**
+ * Get Nuxt DevTools client for host app
+ *
+ * Returns undefined if not in development mode or the devtools is not enabled
+ */
+export function useNuxtDevTools(): Ref<NuxtDevtoolsHostClient | undefined> {
+  const r = shallowRef()
+  if (!process.dev)
+    return r
+
+  if (process.server)
+    return r
+
+  if (window.__NUXT_DEVTOOLS_HOST__) {
+    r.value = window.__NUXT_DEVTOOLS_HOST__
+  }
+  else {
+    Object.defineProperty(window, '__NUXT_DEVTOOLS_HOST__', {
+      set(value) {
+        r.value = value
+      },
+      get() {
+        return r.value
+      },
+      enumerable: false,
+      configurable: true,
+    })
+  }
+  return r
+}

packages/devtools/src/types/global.ts

@@ -1,5 +1,5 @@
 import type { VueInspectorClient } from 'vite-plugin-vue-inspector'
-import type { LoadingTimeMetric, NuxtDevtoolsIframeClient, NuxtDevtoolsGlobal as NuxtDevtoolsViewGlobal, PluginMetric, TimelineMetrics } from '.'
+import type { LoadingTimeMetric, NuxtDevtoolsHostClient, NuxtDevtoolsIframeClient, NuxtDevtoolsGlobal as NuxtDevtoolsViewGlobal, PluginMetric, TimelineMetrics } from '.'
 
 declare global {
   interface Window {
@@ -8,6 +8,11 @@ declare global {
      */
     __NUXT_DEVTOOLS__?: NuxtDevtoolsIframeClient
 
+    /**
+     * Nuxt DevTools client for host app
+     */
+    __NUXT_DEVTOOLS_HOST__?: NuxtDevtoolsHostClient
+
     /**
      * Nuxt DevTools for receiving host client
      *

playgrounds/tab-seo/components/GlobalNav.vue

@@ -1,6 +1,18 @@
+<script setup lang="ts">
+const nd = useNuxtDevTools()
+</script>
+
 <template>
   <div px10 pt10 op50>
     Click to navigate and see the SEO tab
+    <template v-if="nd">
+      <button
+        border="~ rounded gray/30" ml2 px2 hover="border-green text-green"
+        @click="nd.devtools.navigate('/modules/open-graph')"
+      >
+        Open devtools
+      </button>
+    </template>
   </div>
   <div px10 py5 flex="~ gap-4">
     <NuxtLink to="/" active-class="text-green">