Cargo Features

[dependencies]
sync-lsp = { version = "0.1.0", default-features = false, features = ["mio", "dynamic-callbacks"] }
default = dynamic-callbacks, mio

These default features are set whenever sync-lsp is added without default-features = false somewhere in the dependency tree.

mio default

Enables mio 0.8.*

dynamic-callbacks default

sync-lsp has 3 features without comments.