Can you post the output from ‘ionic info’?
See:
- https://www.npmjs.com/package/@types/mapbox-gl
- https://github.com/DefinitelyTyped/DefinitelyTyped
- https://stackoverflow.com/questions/35931380/mapbox-typescript
- Issue in Ionic production build for Mapbox GL JS feature
- https://github.com/mapbox/mapbox-gl-js/issues/2440
- https://stackoverflow.com/questions/35931380/mapbox-typescript