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Add the CometChatCalls Dependency

To add CometChat Calls SDK, please refer to the steps mentioned here.

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Permissions

Our React Native Calls SDK does not work with Expo GO since it requires some custom native modules. Also, expo does not recommend using Expo GO for building production grade apps. So in order to use our Calls SDK in an expo app you need to use development builds. You can follow the official Expo guide for more details.

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Android

You need to add the below permissions & plugin block inside android block of the app.json file. You need to install expo-build-properties package in your app. 
"permissions": [
  "CAMERA",
  "READ_EXTERNAL_STORAGE",
  "WRITE_EXTERNAL_STORAGE",
  "VIBRATE",
  "INTERNET",
  "MODIFY_AUDIO_SETTINGS",
  "RECORD_AUDIO",
  "ACCESS_NETWORK_STATE"
],
"plugins": [
  [
    "expo-build-properties",
    {
      "android": {
        "minSdkVersion": 24,
        "extraMavenRepos": ["https://dl.cloudsmith.io/public/cometchat/cometchat-pro-android/maven/"]
      }
    }
  ]
]

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iOS

You need to add the below permissions block inside ios block of the app.json file. 
"infoPlist": {
    "NSCameraUsageDescription": "This app uses the camera for video calls.",
    "NSMicrophoneUsageDescription": "This app uses the microphonr for audio/video calls."
}

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Initialize CometChat Calls

To initialize CometChat Calls SDK, please refer to the guide here