Cargo Features

tui = { version = "0.19.0", default-features = false, features = ["serde", "termion", "crossterm"] }
default = crossterm

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

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features.

serde implicit feature

With derive and default (std)

termion implicit feature

Enables termion ^1.5

crossterm default

Enables default (bracketed-paste) of crossterm ^0.25