このエラーメッセージに関する原因と対処に関して説明します。
エラーメッセージ(英語):
access environment variables
対処
関連リンク
How to access environment variables from Node app client - Stack ...stackoverflow.com/.../how-to-access-environment-varia...
https://stackoverflow.com/questions/59279618/how-to-access-environment-variables-from-node-app-clien・・・
Access environment variables in handlebar template
https://stackoverflow.com/questions/55850718/access-environment-variables-in-handlebar-template
REACT: How to access environment variables from the front ...
https://stackoverflow.com/questions/57663555/react-how-to-access-environment-variables-from-the-fron・・・