Thanks to recent-ish updates to https://github.com/RReverser/wasm-bindgen-rayon it now compiles nicely with Vite despite the circular dependencies. By upgrading to this latest version we can compile a oxipng module that works.
You'll still need to be using a version of Vite greater than v5.1.6 to compile the circular dependency.
As pointed out in https://github.com/jamsinclair/jSquash/issues/37#issuecomment-2143413705, Oxipng is still having issues when being compiled with an oxipng dependency.
Thanks to recent-ish updates to https://github.com/RReverser/wasm-bindgen-rayon it now compiles nicely with Vite despite the circular dependencies. By upgrading to this latest version we can compile a oxipng module that works.
You'll still need to be using a version of Vite greater than v5.1.6 to compile the circular dependency.