Cargo Features

rexie = { version = "0.5.0", default-features = false, features = ["js"] }
default = js

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

js default = wasm-bindgen-futures

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.

wasm-bindgen-futures js