Transformation for wasm-bindgen to enable usage of anyref in a wasm
module.
This crate is in charge of enabling code using wasm-bindgen to use the
anyref type inside of the wasm module. This transformation pass primarily
wraps exports and imports in shims which use anyref, but quickly turn them
into i32 value types. This is all largely a stopgap until Rust has
first-class support for the anyref type, but that's thought to be in the
far future and will take quite some time to implement. In the meantime, we
have this!
The pass here works by collecting information during binding generation
about imports and exports. Afterwards this pass runs in one go against a
wasm module, updating exports, imports, calls to these functions, etc. The
goal at least is to have valid wasm modules coming in that don't use
anyref and valid wasm modules going out which use anyref at the fringes.