The stackmate preview command shows the changes that will be applied to the stack after you've updated your configuration file
stackmate preview <environment> [-c configuration.yml -d working-directory]
<environment>The environment to preview the changes for
--configuration <file>, -c <file>the configuration file to be used for this operation. By default.stackmate/config.ymlis used--directory <dir>, -d <dir>the directory to use as a working one, where the output-files.md will be generated