From 0bc9d249c3ac1d3113117e3f7b87233d03ed7a0b Mon Sep 17 00:00:00 2001
From: "Xin Du (Clark)" <clark.duxin@gmail.com>
Date: Wed, 23 Dec 2020 14:16:02 +0000
Subject: [PATCH] fix(babel): enable polyfilling of proposal supported by
 core-js (#8545)

---
 packages/babel-preset-app/src/index.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/babel-preset-app/src/index.js b/packages/babel-preset-app/src/index.js
index 2bb1f335ba..6abbe06738 100644
--- a/packages/babel-preset-app/src/index.js
+++ b/packages/babel-preset-app/src/index.js
@@ -87,6 +87,10 @@ module.exports = (api, options = {}) => {
     corejs = { version: Number(corejs) }
   }
 
+  if (corejs.proposals === undefined) {
+    corejs.proposals = true
+  }
+
   const defaultTargets = {
     server: { node: 'current' },
     client: { ie: 9 },