Cargo Features

sledgehammer_bindgen has no features set by default.

sledgehammer_bindgen = { version = "0.5.0", features = ["web"] }
web = wasm-bindgen

Enables web of sledgehammer_bindgen_macro

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 web?