Cargo Features

egui_node_graph has no features set by default.

[dependencies]
egui_node_graph = { version = "0.4.0", features = ["persistence"] }
persistence = serde

Enables serde of slotmap and smallvec and persistence of egui ^0.19.0

egui:

Enable persistence of memory (window positions etc).

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.

serde persistence?