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node_modules/@vue/cli-plugin-babel/generator.js

@@ -0,0 +1,19 @@
+module.exports = api => {
+  // Most likely you want to overwrite the whole config to ensure it's working
+  // without conflicts, e.g. for a project that used Jest without Babel.
+  // It should be rare for the user to have their own special babel config
+  // without using the Babel plugin already.
+  delete api.generator.files['babel.config.js']
+
+  api.extendPackage({
+    babel: {
+      presets: ['@vue/cli-plugin-babel/preset']
+    },
+    vue: {
+      transpileDependencies: true
+    },
+    dependencies: {
+      'core-js': '^3.8.3'
+    }
+  })
+}