Update Koa: export BaseContext, BaseRequest, BaseResponse (#14800)
Update Koa: export BaseContext, BaseRequest, BaseResponse (#14800)


borisyankov/DefinitelyTyped,benishouga/DefinitelyTyped,isman-usoh/DefinitelyTyped,magny/DefinitelyTyped,AgentME/DefinitelyTyped,abbasmhd/DefinitelyTyped,smrq/DefinitelyTyped,aciccarello/DefinitelyTyped,benishouga/DefinitelyTyped,chrootsu/DefinitelyTyped,georgemarshall/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,YousefED/DefinitelyTyped,borisyankov/DefinitelyTyped,aciccarello/DefinitelyTyped,benishouga/DefinitelyTyped,QuatroCode/DefinitelyTyped,arusakov/DefinitelyTyped,abbasmhd/DefinitelyTyped,rolandzwaga/DefinitelyTyped,jimthedev/DefinitelyTyped,alexdresko/DefinitelyTyped,jimthedev/DefinitelyTyped,nycdotnet/DefinitelyTyped,alexdresko/DefinitelyTyped,georgemarshall/DefinitelyTyped,minodisk/DefinitelyTyped,smrq/DefinitelyTyped,ashwinr/DefinitelyTyped,arusakov/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,mcliment/DefinitelyTyped,amir-arad/DefinitelyTyped,magny/DefinitelyTyped,dsebastien/DefinitelyTyped,zuzusik/DefinitelyTyped,QuatroCode/DefinitelyTyped,AgentME/DefinitelyTyped,zuzusik/DefinitelyTyped,chrootsu/DefinitelyTyped,YousefED/DefinitelyTyped,dsebastien/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,one-pieces/DefinitelyTyped,AgentME/DefinitelyTyped,jimthedev/DefinitelyTyped,mcrawshaw/DefinitelyTyped,benliddicott/DefinitelyTyped,georgemarshall/DefinitelyTyped,minodisk/DefinitelyTyped,nycdotnet/DefinitelyTyped,AgentME/DefinitelyTyped,aciccarello/DefinitelyTyped,mcrawshaw/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,rolandzwaga/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,johan-gorter/DefinitelyTyped,markogresak/DefinitelyTyped,georgemarshall/DefinitelyTyped,ashwinr/DefinitelyTyped,johan-gorter/DefinitelyTyped,zuzusik/DefinitelyTyped,isman-usoh/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,arusakov/DefinitelyTyped