Cargo Features

automerge-persistent-fs has no features set by default.

[dependencies]
automerge-persistent-fs = { version = "0.4.0", features = ["async"] }
async = futures, tokio

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.

futures async?
tokio async?