refactor(es6): Upgrade NewWatchingPlugin to es6 (#3620)
refactor(es6): Upgrade NewWatchingPlugin to es6 (#3620)


jescalan/webpack,pugnascotia/webpack,g0ddish/webpack,jescalan/webpack,NekR/webpack,webpack/webpack,ts-webpack/webpack,ts-webpack/webpack,SimenB/webpack,SimenB/webpack,g0ddish/webpack,rlugojr/webpack,nkzawa/webpack,g0ddish/webpack,SimenB/webpack,cesarandreu/webpack,EliteScientist/webpack,SimenB/webpack,webpack/webpack,webpack/webpack,nkzawa/webpack,NekR/webpack,pugnascotia/webpack,rlugojr/webpack,jescalan/webpack,cesarandreu/webpack,ts-webpack/webpack,pugnascotia/webpack,webpack/webpack,nkzawa/webpack,EliteScientist/webpack,ts-webpack/webpack,rlugojr/webpack,cesarandreu/webpack