diff --git a/.eslintignore b/.eslintignore
index 6ff509fc..546965b3 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -5,4 +5,5 @@ example
 .nuxt
 ./dist
 docs
-coverage
\ No newline at end of file
+coverage
+src/plugin.js
\ No newline at end of file
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 00000000..546965b3
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,9 @@
+lib
+test/fixture
+test/e2e
+example
+.nuxt
+./dist
+docs
+coverage
+src/plugin.js
\ No newline at end of file
diff --git a/package.json b/package.json
index ec06032b..a4faa329 100644
--- a/package.json
+++ b/package.json
@@ -87,6 +87,7 @@
     "prettier-eslint-cli": "^5.0.0",
     "release-it": "13.5.8",
     "rollup": "^2.9.0",
+    "rollup-plugin-copy": "^3.3.0",
     "rollup-plugin-typescript2": "^0.27.0",
     "start-server-and-test": "^1.11.0",
     "testcafe": "^1.8.4",
diff --git a/rollup.config.js b/rollup.config.js
index f23ce460..c059fad7 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,4 +1,6 @@
 import typescript from 'rollup-plugin-typescript2'
+import copy from 'rollup-plugin-copy'
+
 import pkg from './package.json'
 
 export default [
@@ -23,19 +25,9 @@ export default [
       typescript({
         typescript: require('typescript'),
       }),
-    ],
-  },
-  {
-    input: 'src/plugin.js',
-    output: [
-      {
-        file: 'lib/plugin.js',
-        format: 'es',
-      },
-    ],
-    external: [
-      ...Object.keys(pkg.dependencies || {}),
-      ...Object.keys(pkg.peerDependencies || {}),
+      copy({
+        targets: [{ src: 'src/plugin.js', dest: 'lib' }],
+      }),
     ],
   },
   {
diff --git a/src/index.ts b/src/index.ts
index 6f502908..fcc150d6 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -3,10 +3,24 @@ import { Module } from '@nuxt/types'
 
 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)
+    }
+  } catch {
+    corejsPolyfill = undefined
+  }
+
   const { dst } = this.addTemplate({
     src: resolve(libRoot, 'lib', 'plugin.js'),
     fileName: join('composition-api', 'plugin.js'),
-    options: {},
+    options: {
+      corejsPolyfill,
+    },
   })
 
   this.options.build = this.options.build || {}
diff --git a/src/plugin.js b/src/plugin.js
index f59029ce..0737228a 100644
--- a/src/plugin.js
+++ b/src/plugin.js
@@ -2,6 +2,14 @@
  * @typedef {import('@nuxt/types').Plugin} Plugin
  */
 
+<% if (options.corejsPolyfill === '3') { %>
+// Necessary polyfill for Composition API support for IE11
+import 'core-js/features/reflect/own-keys'
+<% } else if (options.corejsPolyfill === '2') { %>
+// Necessary polyfill for Composition API support for IE11
+import 'core-js/modules/es6.reflect.own-keys'
+<% } %>
+
 import Vue from 'vue'
 import CompositionApi from '@vue/composition-api'
 
diff --git a/yarn.lock b/yarn.lock
index 13cd6fdd..8c5db783 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1979,6 +1979,13 @@
   dependencies:
     "@types/webpack" "*"
 
+"@types/fs-extra@^8.0.1":
+  version "8.1.0"
+  resolved "https://registry.yarnpkg.com/@types/fs-extra/-/fs-extra-8.1.0.tgz#1114834b53c3914806cd03b3304b37b3bd221a4d"
+  integrity sha512-UoOfVEzAUpeSPmjm7h1uk5MH6KZma2z2O7a75onTGjnNvAvMVrPzPL/vBbT65iIGHWj6rokwfmYcmxmlSf2uwg==
+  dependencies:
+    "@types/node" "*"
+
 "@types/glob@^7.1.1":
   version "7.1.1"
   resolved "https://registry.yarnpkg.com/@types/glob/-/glob-7.1.1.tgz#aa59a1c6e3fbc421e07ccd31a944c30eba521575"
@@ -4694,6 +4701,11 @@ color@^3.0.0:
     color-convert "^1.9.1"
     color-string "^1.5.2"
 
+colorette@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/colorette/-/colorette-1.1.0.tgz#1f943e5a357fac10b4e0f5aaef3b14cdc1af6ec7"
+  integrity sha512-6S062WDQUXi6hOfkO/sBPVwE5ASXY4G2+b4atvhJfSsuUUhIaUKlkjLe9692Ipyt5/a+IPF5aVTu3V5gvXq5cg==
+
 combined-stream@^1.0.6, combined-stream@^1.0.8, combined-stream@~1.0.6:
   version "1.0.8"
   resolved "https://registry.yarnpkg.com/combined-stream/-/combined-stream-1.0.8.tgz#c3d45a8b34fd730631a110a8a2520682b31d5a7f"
@@ -7046,6 +7058,20 @@ globals@^9.18.0:
   resolved "https://registry.yarnpkg.com/globals/-/globals-9.18.0.tgz#aa3896b3e69b487f17e31ed2143d69a8e30c2d8a"
   integrity sha512-S0nG3CLEQiY/ILxqtztTWH/3iRRdyBLw6KMDxnKMchrtbj2OFmehVh0WUCfW3DUrIgx/qFrJPICrq4Z4sTR9UQ==
 
+globby@10.0.1:
+  version "10.0.1"
+  resolved "https://registry.yarnpkg.com/globby/-/globby-10.0.1.tgz#4782c34cb75dd683351335c5829cc3420e606b22"
+  integrity sha512-sSs4inE1FB2YQiymcmTv6NWENryABjUNPeWhOvmn4SjtKybglsyPZxFB3U1/+L1bYi0rNZDqCLlHyLYDl1Pq5A==
+  dependencies:
+    "@types/glob" "^7.1.1"
+    array-union "^2.1.0"
+    dir-glob "^3.0.1"
+    fast-glob "^3.0.3"
+    glob "^7.1.3"
+    ignore "^5.1.1"
+    merge2 "^1.2.3"
+    slash "^3.0.0"
+
 globby@11.0.0:
   version "11.0.0"
   resolved "https://registry.yarnpkg.com/globby/-/globby-11.0.0.tgz#56fd0e9f0d4f8fb0c456f1ab0dee96e1380bc154"
@@ -12257,6 +12283,17 @@ ripemd160@^2.0.0, ripemd160@^2.0.1:
     hash-base "^3.0.0"
     inherits "^2.0.1"
 
+rollup-plugin-copy@^3.3.0:
+  version "3.3.0"
+  resolved "https://registry.yarnpkg.com/rollup-plugin-copy/-/rollup-plugin-copy-3.3.0.tgz#5ba230047f86b9f703a29288f242948a5580e7b9"
+  integrity sha512-euDjCUSBXZa06nqnwCNADbkAcYDfzwowfZQkto9K/TFhiH+QG7I4PUsEMwM9tDgomGWJc//z7KLW8t+tZwxADA==
+  dependencies:
+    "@types/fs-extra" "^8.0.1"
+    colorette "^1.1.0"
+    fs-extra "^8.1.0"
+    globby "10.0.1"
+    is-plain-object "^3.0.0"
+
 rollup-plugin-typescript2@^0.27.0:
   version "0.27.0"
   resolved "https://registry.yarnpkg.com/rollup-plugin-typescript2/-/rollup-plugin-typescript2-0.27.0.tgz#95ff96f9e07d5000a9d2df4d76b548f9a1f83511"