dont use es6 features in the build system
dont use es6 features in the build system

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ml/amphtml,britice/amphtml,alanorozco/amphtml,sortable/amphtml,clawr/amphtml,danielrozenberg/amphtml,interspacejp/amphtml,pietergreyling/amphtml,arealit/amphtml,rsimha-amp/amphtml,rajkumarsrk/amphtml,criteo-forks/amphtml,lannka/amphtml,arealit/amphtml,spotxchange/amphtml,sklobovskaya/amphtml,sriramkrish85/amphtml,jdelhommeau/amphtml,comScore/amphtml,jlucero-contentad/amphtml,clawr/amphtml,NataliaLKB/amphtml,lugray/amphtml,fullspeed-sp/amphtml,dotandads/amphtml,ColombiaAnalytics/amphtml,mlb7687/amphtml,Lith/amphtml,ADITION/amphtml,ericlindley-g/amphtml,ampproject/amphtml,ericlindley-g/amphtml,rajkumarsrk/amphtml,rajkumarsrk/amphtml,adiant/amphtml,media-net/amphtml,zhouyx/amphtml,taboola/amphtml,AaronCritchley/amphtml,zhangsu/amphtml,aghassemi/amphtml,zhangsu/amphtml,mhc-gh/amphtml,gumgum/amphtml,sharethrough/amphtml,rifler/amphtml,keithwrightbos/amphtml,danielrozenberg/amphtml,yieldbot/amphtml,sebastianbenz/amphtml,ADITION/amphtml,voyagegroup/amphtml,spotxchange/amphtml,donttrustthisbot/amphtml,smartadserver/amphtml,simplereach/amphtml,jmadler/amphtml,criteo-forks/amphtml,Gregable/amphtml,wjfang/amphtml,tdrl/amphtml,burtcorp/amphtml,btownsend/amphtml,zhucl/amphtml,burtcorp/amphtml,sebastianbenz/amphtml,jasti/amphtml,yandex-pcode/amphtml,powdercloud/amphtml,sharethrough/amphtml,galeksic/amphtml,adiant/amphtml,jaboc83/amphtml,jlucero-contentad/amphtml,BenDz/amphtml-atinternet,devjsun/amphtml,zhangsu/amphtml,arealit/amphtml,pietergreyling/amphtml,mhc-gh/amphtml,DarXector/amphtml,mlb7687/amphtml,adtechnology/amphtml,prateekbh/amphtml,criteo-forks/amphtml,adtechnology/amphtml,Mobusi-ads/amphtml,cory-work/amphtml,nekodo/amphtml,fullspeed-sp/amphtml,zhouyx/amphtml,jlucero-contentad/amphtml,alanorozco/amphtml,prateekbh/amphtml,jridgewell/amphtml,danielrozenberg/amphtml,sharethrough/amphtml,bpaduch/amphtml,dotandads/amphtml,prateekbh/amphtml,NataliaLKB/amphtml,dotandads/amphtml,arealit/amphtml,widespace-os/amphtml,arealit/amphtml,media-net/amphtml,kixer-com/amphtml,Lith/amphtml,nathangoulding/amphtml,shawnbuso/amphtml,britice/amphtml,keithwrightbos/amphtml,media-net/amphtml,powdercloud/amphtml,koshka/amphtml,loic-seguin/amphtml,ecoron/amphtml,ColombiaAnalytics/amphtml,pedjoni8/amphtml,adtechnology/amphtml,yandex-pcode/amphtml,jridgewell/amphtml,laterpay/amphtml,interspacejp/amphtml,Adtoma/amphtml,camelburrito/amphtml,ampproject/amphtml,rajkumarsrk/amphtml,BenDz/amphtml,simplereach/amphtml,sklobovskaya/amphtml,yandex-pcode/amphtml,koshka/amphtml,camelburrito/amphtml,powdercloud/amphtml,BenDz/amphtml-atinternet,btownsend/amphtml,sklobovskaya/amphtml,erwinmombay/amphtml,tlong2/amphtml,keithwrightbos/amphtml,gumgum/amphtml,yevheniiminin/amphtml,britice/amphtml,Lith/amphtml,erwinmombay/amphtml,koshka/amphtml,jpettitt/amphtml,keithwrightbos/amphtml,avimehta/amphtml,kixer-com/amphtml,clawr/amphtml,luciancrasovan/amphtml,adup-tech/amphtml,taboola/amphtml,ithinkihaveacat/amphtml,interspacejp/amphtml,jpettitt/amphtml,chaveznvg/amphtml,JuliusThms/amphtml,voyagegroup/amphtml,plista/amphtml,NataliaLKB/amphtml,media-net/amphtml,clawr/amphtml,media-net/amphtml,Adtoma/amphtml,erwinmombay/amphtml,keithwrightbos/amphtml,Adtoma/amphtml,loic-seguin/amphtml,yevheniiminin/amphtml,src-code/amphtml,keithwrightbos/amphtml,mlb7687/amphtml,amoad-amoe/amphtml,zhangsu/amphtml,honeybadgerdontcare/amphtml,jridgewell/amphtml,rlugojr/amphtml,widespace-os/amphtml,honeybadgerdontcare/amphtml,kamtschatka/amphtml,taboola/amphtml,loic-seguin/amphtml,AaronCritchley/amphtml,lugray/amphtml,camelburrito/amphtml,shawnbuso/amphtml,burtcorp/amphtml,honeybadgerdontcare/amphtml,pedjoni8/amphtml,DAC-f1h-dev/amphtml,ampproject/amphtml,plista/amphtml,smartadserver/amphtml,aghassemi/amphtml,fullspeed-sp/amphtml,ericlindley-g/amphtml,Gregable/amphtml,Re-lM/amphtml,wjfang/amphtml,nexxtv/amphtml,burtcorp/amphtml,danielrozenberg/amphtml,galeksic/amphtml,cory-work/amphtml,tdrl/amphtml,comScore/amphtml,voyagegroup/amphtml,BrightcoveOS/amphtml,Gregable/amphtml,gumgum/amphtml,chrisbrent/amphtml,honeybadgerdontcare/amphtml,fullspeed-sp/amphtml,tlong2/amphtml,pietergreyling/amphtml,jaboc83/amphtml,adiant/amphtml,DAC-f1h-dev/amphtml,mlb7687/amphtml,donttrustthisbot/amphtml,erwinmombay/amphtml,JuliusThms/amphtml,vmarteev/amphtml,DarXector/amphtml,mhc-gh/amphtml,koshka/amphtml,alanorozco/amphtml,sriramkrish85/amphtml,Lith/amphtml,dvoytenko/amphtml,jdelhommeau/amphtml,cory-work/amphtml,yevheniiminin/amphtml,adtechnology/amphtml,interspacejp/amphtml,nekodo/amphtml,DAC-f1h-dev/amphtml,taboola/amphtml,Adtoma/amphtml,ecoron/amphtml,mkhatib/amphtml,lannka/amphtml,pietergreyling/amphtml,plista/amphtml,mkhatib/amphtml,tdrl/amphtml,nexxtv/amphtml,yevheniiminin/amphtml,camelburrito/amphtml,DAC-f1h-dev/amphtml,jpettitt/amphtml,BenDz/amphtml-atinternet,lzanol/amphtml,Meggin/amphtml,vmarteev/amphtml,laterpay/amphtml,loic-seguin/amphtml,powdercloud/amphtml,ecoron/amphtml,zhucl/amphtml,BenDz/amphtml,clawr/amphtml,britice/amphtml,clawr/amphtml,laterpay/amphtml,jmadler/amphtml,gumgum/amphtml,jast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