yarn not supported

[EndangeredMassa]

This module cannot be installed by yarn after 3.0.0.

error assertive@3.1.0: The engine "yarn" is incompatible with this module. Expected version "0.0.0". Got "1.17.3"
error Found incompatible module.

This is because the package.json's engines section expects yarn to be version 0.0.0 instead of an actual range of support.

[EndangeredMassa]

This can be worked around by using the --ignore-engines flag in yarn commands. You can set this in a .yarnrc as well.

.yarnrc:

--ignore-engines true