Error if externals are missing instead of outputting undefined. webpack/webpack#4771
Error if externals are missing instead of outputting undefined. webpack/webpack#4771

SimenB/webpack,NekR/webpack,SimenB/webpack,NekR/webpack,webpack/webpack,webpack/webpack,SimenB/webpack,webpack/webpack,EliteScientist/webpack,SimenB/webpack,EliteScientist/webpack,webpack/webpack