Version 2.7.1 duplicates everything

Version 2.7.1 duplicates all export like below, and styles doesn't work. After downgrade to 2.7.0, it became normal.

```
export * from './getToastAlertType'
export * from './PageRoute'
export * from './profileSortHelper'
export * from './stringHelper'
export * from './stringHelper'
export * from './useHistory'
export * from './useHistory'
export * from './useHistory'
```