如何修复Could not find plugin "proposal-numeric-separator"，当我尝试构建我的 React 应用程序时出现此错误，我还没有弹出应用程序：
./src/index.js
Error: [BABEL] /home/pc/Downloads/project/src/index.js: Could not find plugin "proposal-numeric-separator". Ensure there is an entry in ./available-plugins.js for it. (While processing: "/home/pc/Downloads/project/node_modules/babel-preset-react-app/index.js$0")
at Array.map (<anonymous>)
at Generator.next (<anonymous>)
at Generator.next (<anonymous>)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
我尝试下载 Babel 和依赖 Proposal Numeric Separator，删除 Node Modules，清理 Yarn 缓存；但没有任何效果。
我使用的是 Yarn 1.22.4 和 Node 13.11.0，但我也尝试过 NPM 6.13.7。