If you simply add an Assembly Definition file to the root directory of an old complete asset in order to reduce compilation time, the Editor folder would not be treated as a special folder and scripts in the Editor folder become compile targets at build time, resulting in a large number of build errors. This asset automatically places the Assembly Definition and Assembly Definition Reference files not only in the root directory but also under the Editor folder with a single click of a button, and allows cross-referencing among scripts in the Editor folder and one-way referencing from scripts in the Editor folder to scripts under the root directory that are not under the Editor folder, eliminating or reducing build errors.

Let's shorten the compilation time with less operations.