Cargo Features

[dependencies]
hass-rs = { version = "0.3.1", default-features = false, features = ["use-tokio", "use-async-std"] }
default = use-tokio

The use-tokio feature is set by default whenever hass-rs is added without default-features = false somewhere in the dependency tree.

use-tokio default = tokio
use-async-std = async-std

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

tokio use-tokio
async-std use-async-std?