Missing WASM setup docs related to ahash/getrandom

[elimerl]

I was trying to setup egui for a WASM project, and it took about 15 minutes of searching to find that I had to manually add getrandom as a dependency for it to work on WASM:

[target.'cfg(target_arch = "wasm32")'.dependencies]
getrandom = { version = "0.2", features = ["js"] }

If possible there should be clearer documentation for setting up on WASM, specifically for this issue. I had to look at commit 5514a8afda53c282d2be670bef657d5c7812d467 to find the solution.

Thanks!

[coderedart]

is this something that ahash crate should be fixing? ahash can provide an optional feature which toggles the js feature of getrandom.

the current method sounds more like a hack to me

reference: tkaitchuck/aHash#59

[emilk]

It seems like this can be solved by not using the (default) runtime-rng feature of ahash. That is: if the egui crates has ahash = { version = "0.8", default-features = false, features = ["compile-time-rng", "std"] } then there is no dependency on getrandom.

…but we get a lot of other dependencies instead, which likely will increase compile times.

Maybe ahash could have a fixed-seed feature flag which doesn't require any dependencies (and doesn't protect against DOS attacks, which egui doesn't really care about anyways, and egui users can still opt-in to)

[elimerl]

Looks this is fixed, thanks!