如何将环境变量添加到 app.json 文件中

Question

我的 app.json 项目中有一个 Expo 文件。在这个文件中，我有两个 API 密钥（下面标记为 API_KEY），我想通过环境变量隐藏它们。

如何使用环境变量而不是对 API 密钥进行硬编码？

app.json

{
  "expo": {
    "name": "Closeout",
    "slug": "Closeout",
    "version": "1.0.0",
    "orientation": "portrait",
    "privacy": "hidden",
    "notification": {
      "icon": "./assets/images/notification-icon.png",
      "color": "#000000",
      "iosDisplayInForeground": true
    },
    "updates": {
      "fallbackToCacheTimeout": 0
    },
    "assetBundlePatterns": ["**/*"],
    "ios": {
      "icon": "./assets/images/icon.png",
      "buildNumber": "2",
      "config": {
        "googleMapsApiKey": "API_KEY"
      }
    },
    "android": {
      "adaptiveIcon": {
        "foregroundImage": "./assets/images/icon.png",
        "backgroundColor": "#000"
      },
      "versionCode": 5,
      "useNextNotificationsApi": true,
      "config": {
        "googleMaps": {
          "apiKey": "API_KEY"
        }
      },
      "googleServicesFile": "./google-services.json"
    }
  }
}