Anyone know the reason why rescript has no colors when running from a concurrently script?
Because it sees that the output target is no longer a user terminal (TTY) but a pipe: to a file, to some weird program, who knows…
You can force it to output colors by setting NINJA_ANSI_FORCED environment var to 1.
Here is a snippet from my Makefile:
BSB := yarn bsb
BSB_FORCE_COLOR := NINJA_ANSI_FORCED=1 $(BSB)
NEXT := yarn next
#...
.PHONY: dev
dev:
yarn concurrently \
--names "rescript,next----" \
--kill-others \
"$(BSB_FORCE_COLOR) -clean -make-world -w" \
"$(NEXT) dev --port 7700"
¹ bsb is an older rescript. I’m not on the latest version still in this project.
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