Union types for possibly undefined return values
Union types for possibly undefined return values

See https://github.com/libxmljs/libxmljs/wiki
YousefED/DefinitelyTyped,ashwinr/DefinitelyTyped,smrq/DefinitelyTyped,nycdotnet/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,chrismbarr/DefinitelyTyped,mcliment/DefinitelyTyped,benishouga/DefinitelyTyped,jimthedev/DefinitelyTyped,nycdotnet/DefinitelyTyped,borisyankov/DefinitelyTyped,scriby/DefinitelyTyped,minodisk/DefinitelyTyped,sledorze/DefinitelyTyped,benishouga/DefinitelyTyped,aciccarello/DefinitelyTyped,pocesar/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,isman-usoh/DefinitelyTyped,psnider/DefinitelyTyped,benishouga/DefinitelyTyped,shlomiassaf/DefinitelyTyped,shlomiassaf/DefinitelyTyped,QuatroCode/DefinitelyTyped,chrootsu/DefinitelyTyped,mcrawshaw/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,sledorze/DefinitelyTyped,benliddicott/DefinitelyTyped,chrootsu/DefinitelyTyped,use-strict/DefinitelyTyped,dsebastien/DefinitelyTyped,subash-a/DefinitelyTyped,ashwinr/DefinitelyTyped,abbasmhd/DefinitelyTyped,aciccarello/DefinitelyTyped,georgemarshall/DefinitelyTyped,arusakov/DefinitelyTyped,abbasmhd/DefinitelyTyped,mcrawshaw/DefinitelyTyped,zuzusik/DefinitelyTyped,psnider/DefinitelyTyped,one-pieces/DefinitelyTyped,hellopao/DefinitelyTyped,rolandzwaga/DefinitelyTyped,zuzusik/DefinitelyTyped,dsebastien/DefinitelyTyped,use-strict/DefinitelyTyped,aciccarello/DefinitelyTyped,alexdresko/DefinitelyTyped,rolandzwaga/DefinitelyTyped,alexdresko/DefinitelyTyped,magny/DefinitelyTyped,schmuli/DefinitelyTyped,smrq/DefinitelyTyped,alvarorahul/DefinitelyTyped,AgentME/DefinitelyTyped,QuatroCode/DefinitelyTyped,AgentME/DefinitelyTyped,alvarorahul/DefinitelyTyped,zuzusik/DefinitelyTyped,schmuli/DefinitelyTyped,pocesar/DefinitelyTyped,arusakov/DefinitelyTyped,amir-arad/DefinitelyTyped,georgemarshall/DefinitelyTyped,borisyankov/DefinitelyTyped,minodisk/DefinitelyTyped,jimthedev/DefinitelyTyped,pocesar/DefinitelyTyped,arusakov/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,martinduparc/DefinitelyTyped,johan-gorter/DefinitelyTyped,YousefED/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,progre/DefinitelyTyped,subash-a/DefinitelyTyped,isman-usoh/DefinitelyTyped,martinduparc/DefinitelyTyped,hellopao/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,micurs/DefinitelyTyped,martinduparc/DefinitelyTyped,schmuli/DefinitelyTyped,scriby/DefinitelyTyped,hellopao/DefinitelyTyped,johan-gorter/DefinitelyTyped,AgentME/DefinitelyTyped,georgemarshall/DefinitelyTyped,AgentME/DefinitelyTyped,markogresak/DefinitelyTyped,magny/DefinitelyTyped,progre/DefinitelyTyped,psnider/DefinitelyTyped,georgemarshall/DefinitelyTyped,chrismbarr/DefinitelyTyped,jimthedev/DefinitelyTyped