On errors in the gulp plugin, write out standard error before emitting the error event so that the errors are seen before the process exits.
On errors in the gulp plugin, write out standard error before emitting the error event so that the errors are seen before the process exits.

google/closure-compiler-npm,ChadKillingsworth/closure-compiler-npm,google/closure-compiler-npm,ChadKillingsworth/closure-compiler-npm