Open1
HTMLに環境変数を埋め込む

env
REACT_APP_FLYLE_SDK_KEY=hogehoge
index.html
<script>
const a = { sdkKey: '%REACT_APP_FLYLE_SDK_KEY%' };
</script>
REACT_APP_FLYLE_SDK_KEY=hogehoge
<script>
const a = { sdkKey: '%REACT_APP_FLYLE_SDK_KEY%' };
</script>