Cargo Features

[dependencies]
safeapp-notifier = { version = "0.5.7", default-features = false, features = ["worker-v0-5", "worker-v0-4"] }
default = worker-v0-5

The worker-v0-5 feature is set by default whenever safeapp-notifier is added without default-features = false somewhere in the dependency tree.

worker-v0-5 default = worker
worker-v0-4 = worker-v4

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.

worker worker-v0-5
worker-v4 worker-v0-4?

Enables worker ^0.4