Review config_check.js

[KristjanESPERANTO]

Only details changes. No functional changes.

• remove superfluous colors in Log.error
• invert negative if
• update ESLint env
• use camel case variable name
• optimize Log strings

[sdetweil]

why is this the only acceptable answer?
Log.info(Checking config file ${configFileName} ...);

I don't like the lack of visibility of the variable use

[KristjanESPERANTO]

why is this the only acceptable answer?

Sorry, I don't understand this question. What do you mean by answer?

I don't like the lack of visibility of the variable use

What editor do you use? I think even in editors without syntax highlighting the variables in template literals are well recognizable by the ${}.