frontend: Migrate from deprecated babel/polyfill to core-js

tossy310 · tossy310 · commit 6c3b69726a9d · 2026-02-15T17:22:38.000+09:00
diff --git a/frontend/babel.config.json b/frontend/babel.config.json
@@ -3,9 +3,9 @@
     [
       "@babel/preset-env",
       {
-        "targets": {
-          "browsers": ["last 2 Chrome versions", "Firefox ESR"]
-        }
+        "useBuiltIns": "entry",
+        "corejs": 3,
+        "targets": "defaults"
       }
     ],
     "@babel/preset-react",
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
diff --git a/frontend/package.json b/frontend/package.json
@@ -17,8 +17,8 @@
   "author": "",
   "license": "Apache-2.0",
   "dependencies": {
-    "@babel/polyfill": "^7.12.1",
     "axios": "^1.13.5",
+    "core-js": "^3.40.0",
     "bootstrap-material-design": "^4.1.3",
     "firebase": "^11.2.0",
     "immutability-helper": "^2.9.1",
diff --git a/frontend/src/index.tsx b/frontend/src/index.tsx
@@ -13,7 +13,7 @@
 // limitations under the License.
 
 // Import this first to support old browsers.
-import '@babel/polyfill';
+import 'core-js/stable';
 
 import React from 'react';
 import ReactDOM from 'react-dom';

Original file line number	Diff line number	Diff line change
`@@ -3,9 +3,9 @@`
`3`	`3`	`[`
`4`	`4`	`"@babel/preset-env",`
`5`	`5`	`{`
`6`		`- "targets": {`
`7`		`- "browsers": ["last 2 Chrome versions", "Firefox ESR"]`
`8`		`- }`
	`6`	`+ "useBuiltIns": "entry",`
	`7`	`+ "corejs": 3,`
	`8`	`+ "targets": "defaults"`
`9`	`9`	`}`
`10`	`10`	`],`
`11`	`11`	`"@babel/preset-react",`