On a side note: it may be possible to transparently support wasm by using web_time::* instead of of std::time where needed, as it automatically falls back to std::time on supported targets. This would remove the need for the js feature, but also introduce some magic around the web_time dependency.

I am also looking for wasm support from moka and found this PR. I think it can be compiled to different targets based on target_arch just like opendal.

https://github.com/apache/opendal/blob/8332367dd7629bebc7759a11a5bbbd941dd060e9/core/core/src/raw/time.rs#L27-L30

#[cfg(not(all(target_arch = "wasm32", target_os = "unknown")))]
pub use std::time::{Instant, SystemTime};
#[cfg(all(target_arch = "wasm32", target_os = "unknown"))]
pub use web_time::{Instant, SystemTime};