Cargo Features

spanned_json_parser has no features set by default.

[dependencies]
spanned_json_parser = { version = "0.2.0", features = ["wasm"] }
wasm = wasm-bindgen

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 wasm?