import 'web-streams-polyfill' ; import 'abortcontroller-polyfill/dist/abortcontroller-polyfill-only' ; require ( 'web-stream-tools' ) ; ( < any > global ) . window = ( < any > global ) . window || global ; Object . defineProperty ( ArrayBuffer , Symbol . hasInstance , { writable : true , configurable : true , value ( inst ) { return inst && inst . constructor && inst . constructor . name === 'ArrayBuffer' ; } , } ) ; require ( 'rxjs/internal/symbol/observable' ) ;