...When not in staged pre-commit mode, use this flag to compare changes with the specified branch. Defaults to master (git) / default (hg) branch. Do not resolve prettier config when determining which files to format, just use standard set of supported file types & extensions prettier supports. This may be useful if you do not need any customization and see performance issues. Check that files are correctly formatted, but don't format them. This is useful on CI to verify that all changed files in the current branch were correctly formatted.