fix: register composition api before layouts

closes #64, #65

package.json

@@ -27,7 +27,6 @@
     "lib/index.d.ts",
     "!**/*.map"
   ],
-  "sideEffects": false,
   "scripts": {
     "build": "yarn clean && yarn compile",
     "watch": "yarn compile -w",

src/index.ts

@@ -1,16 +1,18 @@
 import { resolve, join } from 'path'
+import Vue from 'vue'
+import CompositionApi from '@vue/composition-api'
 import type { Module } from '@nuxt/types'
 
+Vue.use(CompositionApi)
+
 const compositionApiModule: Module<any> = function () {
   const libRoot = resolve(__dirname, '..')
 
   let corejsPolyfill
   try {
-    if (!this.options.modern) {
-      // eslint-disable-next-line
-      const corejsPkg = require('core-js/package.json')
-      corejsPolyfill = corejsPkg.version.slice(0, 1)
-    }
+    // eslint-disable-next-line
+    const corejsPkg = require('core-js/package.json')
+    corejsPolyfill = corejsPkg.version.slice(0, 1)
   } catch {
     corejsPolyfill = undefined
   }

src/plugin.js

@@ -10,13 +10,8 @@ import 'core-js/features/reflect/own-keys'
 import 'core-js/modules/es6.reflect.own-keys'
 <% } %>
 
-import Vue from 'vue'
-import CompositionApi from '@vue/composition-api'
-
 import { setSSRContext } from 'nuxt-composition-api'
 
-Vue.use(CompositionApi)
-
 /**
  *
  * @type {Plugin} plugin

test/fixture/layouts/default.vue

@@ -3,6 +3,10 @@
     <h1>Test fixture</h1>
     <Nuxt />
     <footer>
+      <h2>Layout</h2>
+      <p>
+        <code>route: {{ route.path }}</code>
+      </p>
       <p>
         <nuxt-link to="/">
           Link back home
@@ -13,11 +17,17 @@
 </template>
 
 <script>
-import { defineComponent, useContext } from 'nuxt-composition-api'
+import { defineComponent, useContext, useMeta } from 'nuxt-composition-api'
 
 export default defineComponent({
+  head: {},
   setup() {
     const { route } = useContext()
+
+    const { title } = useMeta()
+    title.value = 'My fixture'
+
+    return { route, title }
   },
 })
 </script>

test/fixture/nuxt.config.js

@@ -6,7 +6,6 @@ module.exports = {
   buildDir: resolve(__dirname, '.nuxt'),
   srcDir: __dirname,
   head: {
-    title: 'My fixture',
     link: [
       {
         rel: "stylesheet", href: "https://newcss.net/lite.css"