Thanks for your response Anton, in this case maybe it's a little necessary to update the current traccar web references to build traccar web because the actual documentation just include the steps for legacy version.
The modern app is a standard Node project. You can find available commands in the package.json
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Recently I have installed the latest version of Traccar and after all I realize that the modern GUI was deployed for Traccar web so, its the modern GUI actually the current web interface for default?