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Interacting with 'User Program before build'

Hi,
uVision 5.11.1 with LPC4357
I compile Javascript as part of the build using the 'Run User Program Before Build/Rebuild' User setting. I would like to resolve the following issues:
1) Javascript errors are shown in the build log but soon disappear & are not shown in the summary.
Q) Is there a way of passing back a status code to the IDE?

2) I don't want to compile/minify Javascript during development. Is there a way of feeding C/C++ Defines to the User program (then I could check for debug/release defines)?