Downgrade core-js to v2.6.12

babel.config.js

@@ -5,7 +5,7 @@ module.exports = (api) => {
     debug: false,
     modules: false,
     useBuiltIns: 'usage',
-    corejs: '3.15',
+    corejs: '2.6',
   };
 
   const config = {
@@ -46,6 +46,7 @@ module.exports = (api) => {
           helpers: true,
           regenerator: false,
           useESModules: true,
+          corejs: 2,
         },
       ],
     ]);

package.json

@@ -61,7 +61,7 @@
     "classnames": "^2.2.5",
     "compression-webpack-plugin": "^6.0.2",
     "copy-webpack-plugin": "6.4.0",
-    "core-js": "^3.15.2",
+    "core-js": "^2.6.12",
     "cryptocurrency-icons": "^0.17.2",
     "css-loader": "^5.2.6",
     "cssnano": "^4.1.10",

yarn.lock

@@ -4168,15 +4168,10 @@ core-js@^1.0.0:
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-1.2.7.tgz#652294c14651db28fa93bd2d5ff2983a4f08c636"
   integrity sha1-ZSKUwUZR2yj6k70tX/KYOk8IxjY=
 
-core-js@^2.4.0:
-  version "2.6.1"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.1.tgz#87416ae817de957a3f249b3b5ca475d4aaed6042"
-  integrity sha512-L72mmmEayPJBejKIWe2pYtGis5r0tQ5NaJekdhyXgeMQTpJoBsH0NL4ElY2LfSoV15xeQWKQ+XTTOZdyero5Xg==
-
-core-js@^3.15.2:
-  version "3.15.2"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.15.2.tgz#740660d2ff55ef34ce664d7e2455119c5bdd3d61"
-  integrity sha512-tKs41J7NJVuaya8DxIOCnl8QuPHx5/ZVbFo1oKgVl1qHFBBrDctzQGtuLjPpRdNTWmKPH6oEvgN/MUID+l485Q==
+core-js@^2.4.0, core-js@^2.6.12:
+  version "2.6.12"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.12.tgz#d9333dfa7b065e347cc5682219d6f690859cc2ec"
+  integrity sha512-Kb2wC0fvsWfQrgk8HU5lW6U/Lcs8+9aaYcy4ZFc6DDlo4nZ7n70dEgE5rtR0oG6ufKDUnrwfWL1mXR5ljDatrQ==
 
 core-util-is@1.0.2, core-util-is@~1.0.0:
   version "1.0.2"