The 'commands' property of both AppBar and Menu can take both a single command or an array of commands. Since there is no syntax to type this duality, we should indicate an array of commands instead.
The 'commands' property of both AppBar and Menu can take both a single command or an array of commands. Since there is no syntax to type this duality, we should indicate an array of commands instead.

Kuniwak/DefinitelyTyped,dsebastien/DefinitelyTyped,olemp/DefinitelyTyped,JeremyCBrooks/DefinitelyTyped,mvarblow/DefinitelyTyped,progre/DefinitelyTyped,lseguin42/DefinitelyTyped,OfficeDev/DefinitelyTyped,hypno2000/typings,greglockwood/DefinitelyTyped,jimthedev/DefinitelyTyped,schmuli/DefinitelyTyped,zuohaocheng/DefinitelyTyped,stephenjelfs/DefinitelyTyped,dumbmatter/DefinitelyTyped,CodeZombieCH/DefinitelyTyped,jiaz/DefinitelyTyped,mattanja/DefinitelyTyped,theyelllowdart/DefinitelyTyped,mhegazy/DefinitelyTyped,xswordsx/DefinitelyTyped,M-Zuber/DefinitelyTyped,gcastre/DefinitelyTyped,bardt/DefinitelyTyped,lukehoban/DefinitelyTyped,Seltzer/DefinitelyTyped,donnut/DefinitelyTyped,slavomirvojacek/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,jesseschalken/DefinitelyTyped,Shiak1/DefinitelyTyped,lbguilherme/DefinitelyTyped,mrozhin/DefinitelyTyped,miguelmq/DefinitelyTyped,sclausen/DefinitelyTyped,bayitajesi/DefinitelyTyped,nobuoka/DefinitelyTyped,akonwi/DefinitelyTyped,fredgalvao/DefinitelyTyped,TanakaYutaro/DefinitelyTyped,bpowers/DefinitelyTyped,martinduparc/DefinitelyTyped,philippsimon/DefinitelyTyped,bkristensen/DefinitelyTyped,Airblader/DefinitelyTyped,arcticwaters/DefinitelyTyped,nojaf/DefinitelyTyped,aaharu/DefinitelyTyped,vincentw56/DefinitelyTyped,yuit/DefinitelyTyped,johnnycrab/DefinitelyTyped,LordJZ/DefinitelyTyped,smrq/DefinitelyTyped,gorcz/DefinitelyTyped,zhiyiting/DefinitelyTyped,mrk21/DefinitelyTyped,iislucas/DefinitelyTyped,MidnightDesign/DefinitelyTyped,teddyward/DefinitelyTyped,tinganho/DefinitelyTyped,nainslie/DefinitelyTyped,Litee/DefinitelyTyped,gildorwang/DefinitelyTyped,arueckle/DefinitelyTyped,hor-crux/DefinitelyTyped,slavomirvojacek/DefinitelyTyped,Zzzen/DefinitelyTyped,nainslie/DefinitelyTyped,omidkrad/DefinitelyTyped,Deathspike/DefinitelyTyped,YousefED/DefinitelyTyped,quantumman/DefinitelyTyped,wilfrem/DefinitelyTyped,nseckinoral/DefinitelyTyped,dariajung/DefinitelyTyped,mendix/DefinitelyTyped,samdark/DefinitelyTyped,whoeverest/DefinitelyTyped,behzad88/DefinitelyTyped,behzad888/DefinitelyTyped,CodeZombieCH/DefinitelyTyped,bilou84/DefinitelyTyped,danfma/DefinitelyTyped,reppners/DefinitelyTyped,Chris380/DefinitelyTyped,Softpagehomeware/DefinitelyTyped,amanmahajan7/DefinitelyTyped,kanreisa/DefinitelyTyped,CSharpFan/DefinitelyTyped,paulmorphy/DefinitelyTyped,vote539/DefinitelyTyped,rfranco/DefinitelyTyped,applesaucers/lodash-invokeMap,raijinsetsu/DefinitelyTyped,martinduparc/DefinitelyTyped,Mek7/DefinitelyTyped,maglar0/DefinitelyTyped,jimthedev/DefinitelyTyped,frogcjn/DefinitelyTyped,richardTowers/DefinitelyTyped,isman-usoh/DefinitelyTyped,RedSeal-co/DefinitelyTyped,jaysoo/DefinitelyTyped,DeluxZ/DefinitelyTyped,forumone/DefinitelyTyped,Zorgatone/DefinitelyTyped,pocesar/DefinitelyTyped,shlomiassaf/DefinitelyTyped,chrootsu/DefinitelyTyped,WritingPanda/DefinitelyTyped,bluong/DefinitelyTyped,optical/DefinitelyTyped,stimms/DefinitelyTyped,AgentME/DefinitelyTyped,onecentlin/DefinitelyTyped,emanuelhp/DefinitelyTyped,takenet/DefinitelyTyped,uestcNaldo/DefinitelyTyped,TheBay0r/DefinitelyTyped,ErykB2000/DefinitelyTyped,tgfjt/DefinitelyTyped,mjjames/DefinitelyTyped,glenndierckx/DefinitelyTyped,furny/DefinitelyTyped,aldo-roman/DefinitelyTyped,elisee/DefinitelyTyped,TrabacchinLuigi/DefinitelyTyped,eugenpodaru/DefinitelyTyped,mszczepaniak/DefinitelyTyped,stacktracejs/DefinitelyTyped,schmuli/DefinitelyTyped,eekboom/DefinitelyTyped,xica/DefinitelyTyped,mattblang/DefinitelyTyped,tan9/DefinitelyTyped,tigerxy/DefinitelyTyped,benishouga/DefinitelyTyped,drinchev/DefinitelyTyped,Wordenskjold/DefinitelyTyped,mshmelev/DefinitelyTyped,rcchen/DefinitelyTyped,scatcher/DefinitelyTyped,herrmanno/DefinitelyTyped,UzEE/DefinitelyTyped,jacqt/DefinitelyTyped,musicist288/DefinitelyTyped,arcticwaters/DefinitelyTyped,Pro/DefinitelyTyped,subjectix/DefinitelyTyped,abner/DefinitelyTyped,mcliment/DefinitelyTyped,benishouga/DefinitelyTyped,innerverse/DefinitelyTyped,igorraush/DefinitelyTyped,vote539/DefinitelyTyped,fredgalvao/DefinitelyTyped,toedter/DefinitelyTyped,hatz48/DefinitelyTyped,Trapulo/DefinitelyTyped,ayanoin/DefinitelyTyped,Airblader/DefinitelyTyped,nabeix/DefinitelyTyped,takfjt/DefinitelyTyped,duncanmak/DefinitelyTyped,tarruda/DefinitelyTyped,KonaTeam/DefinitelyTyped,alexdresko/DefinitelyTyped,dmoonfire/DefinitelyTyped,Ptival/DefinitelyTyped,wcomartin/DefinitelyTyped,musakarakas/DefinitelyTyped,modifyink/DefinitelyTyped,bjfletcher/DefinitelyTyped,DzmitryDulko/DefinitelyTyped,sclausen/DefinitelyTyped,johnnycrab/DefinitelyTyped,wbuchwalter/DefinitelyTyped,abbasmhd/DefinitelyTyped,stephenjelfs/DefinitelyTyped,wilfrem/DefinitelyTyped,syntax42/DefinitelyTyped,stanislavHamara/DefinitelyTyped,philippstucki/DefinitelyTyped,georgemarshall/DefinitelyTyped,toedter/DefinitelyTyped,mhegazy/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,alvarorahul/DefinitelyTyped,scriby/DefinitelyTyped,david-driscoll/DefinitelyTyped,wkrueger/DefinitelyTyped,musically-ut/DefinitelyTyped,rschmukler/DefinitelyTyped,martinduparc/DefinitelyTyped,Pipe-shen/DefinitelyTyped,pwelter34/DefinitelyTyped,thSoft/DefinitelyTyped,alexdresko/DefinitelyTyped,Bunkerbewohner/DefinitelyTyped,newclear/DefinitelyTyped,paxibay/DefinitelyTyped,robl499/DefinitelyTyped,aciccarello/DefinitelyTyped,greglo/DefinitelyTyped,psnider/DefinitelyTyped,rcchen/DefinitelyTyped,benliddicott/DefinitelyTyped,toedter/DefinitelyTyped,the41/DefinitelyTyped,rerezz/DefinitelyTyped,algorithme/DefinitelyTyped,flyfishMT/DefinitelyTyped,mareek/DefinitelyTyped,use-strict/DefinitelyTyped,pocesar/DefinitelyTyped,shiwano/DefinitelyTyped,ajtowf/DefinitelyTyped,gdi2290/DefinitelyTyped,smrq/DefinitelyTyped,mattblang/DefinitelyTyped,aroder/DefinitelyTyped,use-strict/DefinitelyTyped,philippstucki/DefinitelyTyped,hiraash/DefinitelyTyped,gyohk/DefinitelyTyped,schmuli/DefinitelyTyped,gyohk/DefinitelyTyped,anweiss/DefinitelyTyped,reppners/DefinitelyTyped,hellopao/DefinitelyTyped,samwgoldman/DefinitelyTyped,munxar/DefinitelyTyped,stylelab-io/DefinitelyTyped,GodsBreath/DefinitelyTyped,zuzusik/DefinitelyTyped,GregOnNet/DefinitelyTyped,GlennQuirynen/DefinitelyTyped,raijinsetsu/DefinitelyTyped,ciriarte/DefinitelyTyped,dflor003/DefinitelyTyped,gregoryagu/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,Riron/DefinitelyTyped,NelsonLamprecht/DefinitelyTyped,fnipo/DefinitelyTyped,one-pieces/DefinitelyTyped,RX14/DefinitelyTyped,magny/DefinitelyTyped,danfma/DefinitelyTyped,arma-gast/DefinitelyTyped,Zenorbi/DefinitelyTyped,syuilo/DefinitelyTyped,darkl/DefinitelyTyped,Dashlane/DefinitelyTyped,AGBrown/DefinitelyTyped-ABContrib,nelsonmorais/DefinitelyTyped,nakakura/DefinitelyTyped,yuit/DefinitelyTyped,biomassives/DefinitelyTyped,xStrom/DefinitelyTyped,mshmelev/DefinitelyTyped,jbrantly/DefinitelyTyped,nodeframe/DefinitelyTyped,iislucas/DefinitelyTyped,abner/DefinitelyTyped,sixinli/DefinitelyTyped,dragouf/DefinitelyTyped,bennett000/DefinitelyTyped,OpenMaths/DefinitelyTyped,dpsthree/DefinitelyTyped,cvrajeesh/DefinitelyTyped,arusakov/DefinitelyTyped,superduper/DefinitelyTyped,brettle/DefinitelyTyped,DenEwout/DefinitelyTyped,Minishlink/DefinitelyTyped,stimms/DefinitelyTyped,duongphuhiep/DefinitelyTyped,cherrydev/DefinitelyTyped,kalloc/DefinitelyTyped,Syati/DefinitelyTyped,mjjames/DefinitelyTyped,Nemo157/DefinitelyTyped,arusakov/DefinitelyTyped,blink1073/DefinitelyTyped,Belelros/DefinitelyTyped,AgentME/DefinitelyTyped,chbrown/DefinitelyTyped,DeadAlready/DefinitelyTyped,felipe3dfx/DefinitelyTyped,JeremyCBrooks/DefinitelyTyped,Zzzen/DefinitelyTyped,pafflique/DefinitelyTyped,thSoft/DefinitelyTyped,hatz48/DefinitelyTyped,BrandonCKrueger/DefinitelyTyped,MugeSo/DefinitelyTyped,QuatroCode/DefinitelyTyped,flyfishMT/DefinitelyTyped,adamcarr/DefinitelyTyped,chrismbarr/DefinitelyTyped,igorsechyn/DefinitelyTyped,pocesar/DefinitelyTyped,david-driscoll/DefinitelyTyped,kabogo/DefinitelyTyped,ashwinr/DefinitelyTyped,isman-usoh/DefinitelyTyped,Karabur/DefinitelyTyped,evandrewry/DefinitelyTyped,Syati/DefinitelyTyped,ryan-codingintrigue/DefinitelyTyped,teves-castro/DefinitelyTyped,stacktracejs/DefinitelyTyped,giggio/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,akonwi/DefinitelyTyped,tan9/DefinitelyTyped,georgemarshall/DefinitelyTyped,florentpoujol/DefinitelyTyped,Dashlane/DefinitelyTyped,frogcjn/DefinitelyTyped,JaminFarr/DefinitelyTyped,zensh/DefinitelyTyped,JeremyCBrooks/DefinitelyTyped,gandjustas/DefinitelyTyped,spearhead-ea/DefinitelyTyped,ml-workshare/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,billccn/DefinitelyTyped,haskellcamargo/DefinitelyTyped,aaharu/DefinitelyTyped,hesselink/DefinitelyTyped,georgemarshall/DefinitelyTyped,panuhorsmalahti/DefinitelyTyped,mcrawshaw/DefinitelyTyped,Lorisu/DefinitelyTyped,Belelros/DefinitelyTyped,goaty92/DefinitelyTyped,unknownloner/DefinitelyTyped,slavomirvojacek/adbrain-typescript-definitions,davidsidlinger/DefinitelyTyped,axelcostaspena/DefinitelyTyped,philippsimon/DefinitelyTyped,newclear/DefinitelyTyped,greglo/DefinitelyTyped,aciccarello/DefinitelyTyped,nobuoka/DefinitelyTyped,muenchdo/DefinitelyTyped,gcastre/DefinitelyTyped,slavomirvojacek/adbrain-typescript-definitions,Ridermansb/DefinitelyTyped,abmohan/DefinitelyTyped,tgrospic/DefinitelyTyped,EnableSoftware/DefinitelyTyped,vagarenko/DefinitelyTyped,bdoss/DefinitelyTyped,panuhorsmalahti/DefinitelyTyped,shlomiassaf/DefinitelyTyped,paulbakker/DefinitelyTyped,chrilith/DefinitelyTyped,Belelros/DefinitelyTyped,chadoliver/DefinitelyTyped,robertbaker/DefinitelyTyped,damianog/DefinitelyTyped,applesaucers/lodash-invokeMap,chrismbarr/DefinitelyTyped,moonpyk/DefinitelyTyped,Fraegle/DefinitelyTyped,shahata/DefinitelyTyped,amir-arad/DefinitelyTyped,Karabur/DefinitelyTyped,Ptival/DefinitelyTyped,jasonswearingen/DefinitelyTyped,DustinWehr/DefinitelyTyped,anweiss/DefinitelyTyped,nmalaguti/DefinitelyTyped,rushi216/DefinitelyTyped,emanuelhp/DefinitelyTyped,jraymakers/DefinitelyTyped,psnider/DefinitelyTyped,psnider/DefinitelyTyped,ahmedalsudani/DefinitelyTyped,vasek17/DefinitelyTyped,progre/DefinitelyTyped,ajtowf/DefinitelyTyped,ryan10132/DefinitelyTyped,rolandzwaga/Defin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