review comments: use typeof
review comments: use typeof

Zirpon/tchannel,savaki/tchannel,RyanTech/tchannel,Zirpon/tchannel,chenwenbin928/tchannel,bunnyblue/tchannel,RyanTech/tchannel,sasa233/tchannel,sasa233/tchannel,vanloswang/tchannel,bunnyblue/tchannel,benfleis/tchannel,chenwenbin928/tchannel,i/tchannel,benfleis/tchannel,hustxiaoc/tchannel,savaki/tchannel,vanloswang/tchannel,vanloswang/tchannel,benfleis/tchannel,bunnyblue/tchannel,sasa233/tchannel,RyanTech/tchannel,Zirpon/tchannel,i/tchannel,i/tchannel,hustxiaoc/tchannel,chenwenbin928/tchannel,hustxiaoc/tchannel,savaki/tchannel