As of right now, the conditional import in bitfield.dart is based on dart.library.js_util, which evaluates to true on both JS and wasm backends. (See

). However, the reason for the separate web implementation is for JS floating-point precision issues, which do not apply to wasm. We should consider using the _bitfield_io.dart implementation in dart2wasm, which basically means switching the conditional import to use something like dart.library.html or dart.library.js or something like that instead.