This version is the official release for mesmer v1.0.0. It restructures much of the code base to be more modular, flexible and stable. Mesmer now fully relies on xarray data structures, including xr.DataTree. We integrated MESMER-M, allowing the users to emulate monthly temperatures, and MESMER-X, which enables emulation of any climate variable using conditional distributions. Version 1.0.0 adds additional improvements and bug fixes beyond the release candidate.