Add type declaration and fix some type mismatch between iOS and Android

ak1394 / react-native-tts

React Native Text-To-Speech library for Android and iOS

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Closed Sharcoux closed 4 years ago

Sharcoux commented 4 years ago

The PR will provide type declaration for people using typing systems such as typescript or flow.

While writing the file, I discovered some mismatches in the return values between iOS and Android, so I fixed them.

ak1394 commented 4 years ago

Thanks a lot for your contribution!