index file name discrepancy in react-native-library

I have a react-native library. I am exporting methods in this library as below.

index.ts

...code...const MyHealthLibrary: iosHealthkit = {  requestAuthorization: NotSupportedMethod,  getHealthData: NotSupportedMethod}export * from './types';export * from './authTypes';export default MyHealthLibrary;

index.ios.ts

...code...const MyHealthLibrary: iosHealthkit = {  requestAuthorization,  getHealthData}export * from './types';export * from './authTypes';export default MyHealthLibrary;

Now the above code works as expected.
Now as soon as i rename "index.ios.ts" to "index.healthkit.ts" or "index.healthdata.ts" i get error. The library doesn't function as expected.
What does the file name have to do with anything??? Any help would be great