import * as React from 'react' ; type Props = { demoFileUrl : string ; selectFile ? : ( event : React . MouseEvent < HTMLAnchorElement , MouseEvent > ) => void ; setFileUrl : ( url : string ) => void ; } ; export const StartScreen = ( props ) => ( < React . Fragment > Try to drop some model here , or { ' ' } < a href = "#" onClick = { event => { if ( props . selectFile ) { props . selectFile ( event ) ; } event . preventDefault ( ) ; } } > click here < /a>{' '} to select a model to upload . < br / > Also , you can { ' ' } < a href = "#" onClick = { event => { props . setFileUrl ( props . demoFileUrl ) ; event . preventDefault ( ) ; } } > start demo file viewing < /a> . < /React.Fragment>);