I'm trying out our build using Go 1.18.5 and gopherjs master. I'm using GOOS=js GOARCH=ecmascript

The build fails because some dependencies are attempting to use syscall.MSG_PEEK and syscall.MSG_DONTWAIT. Part of me thinks we are using dependencies that really shouldn't be included in a GopherJS build, but I wanted to check. If these are legit usages, then it seems like some syscall stuff needs generated for GOOS=js GOARCH=ecmascript. We're hacking around it by slapping in build tags in vendored dependencies files to hide them from the build. I probably don't have to say how nervous that makes me. 😨

Looking at this makes me think that there is missing tag/target generation.

I understand that's std library stuff, but I wanted to bring it up here to get perspective on it. If there does need to be additional targets/tags generated, it seems like it would be good to have you all involved in asking for it.