Originally posted by @chalin in #611 (comment)

@LisaFC et al.: somehow #540 reverted #413. The latter introduced the use of hugo.IsProduction, in replacement of the environment-variable checking code. IMHO, use of hugo.IsProduction is the better (if not proper) way to determine the build environment, in particular since the build environment can be specified using the -e flag command line flag.

Possibly related: #611
Related: #651

/cc @nate-double-u