Cargo Features

[dependencies]
bevy_app = { version = "0.15.0-rc.2", default-features = false, features = ["bevy_debug_stepping", "bevy_reflect", "reflect_functions"] }
default = bevy_reflect

The bevy_reflect feature is set by default whenever bevy_app is added without default-features = false somewhere in the dependency tree.

trace bevy_debug_stepping
bevy_reflect default reflect_functions?

Enables bevy_reflect, bevy_reflect of bevy_ecs

reflect_functions = bevy_reflect

Enables reflect_functions of bevy_ecs and functions of bevy_reflect

bevy_reflect:

Enables function reflection

bevy_app has 4 features without comments.