web-sys examples/tests conversion

[daxpedda]

There are some problems setting up the test environment properly, CI should work like this currently, but calling build_all.sh will not use the static folder in each example, but it will build.

• cargo-web doesn't work with web-sys: unsupported custom section: '__wasm_bindgen_unstable' koute/cargo-web#92 (maybe we should report this properly)
• wasm-pack doesn't support bin crates: support building binary crates rustwasm/wasm-pack#734, feat(build): add first-class support for binary crates rustwasm/wasm-pack#736
  • this can be worked around by spamming crate-type = ["cdylib", "rlib"] everywhere
  • or we can use wasm-bindgen directly, which supports this
• cargo-web outputs classic js files, opposed to wasm-pack outputting js modules, so we would have to make a seperate index.html for both
  • this can be worked around by making wasm-pack output classic js files with no-modules
• the multi_thread example has multiple problems
  • files generated by wasm-bindgen don't automatically execute, we have to call init manually, which won't work with workers: Automatically start main on import. rustwasm/wasm-bindgen#1939, Add default module to init for no-modules output mode. rustwasm/wasm-bindgen#1938 (I already made PR's to wasm-bindgen to fix this)
  • currently workers don't support JS modules, so we are forced to compile the worker with no-modules: firefox, chrome, webkit (this will work in chrome soon, I implemented an API to use this)
  • gloo::timers doesn't handle that window might not exist because we are inside a worker, I made a PR to fix this: Fix timers to work in workers too. rustwasm/gloo#106

Current I made a static folder where I put an index.html to work with wasm-bindgen/wasm-pack properly, but this doesn't use the static folders that are in every example for adding scripts, css or other things.

The only other solution that would work right now is to duplicate all the data for cargo-web and wasm-pack each.

Cc #558, #826, #813, #817, #818, #827, #862, #867, #868.

[jstarry]

@daxpedda I think that this approach of supporting both web-sys and stdweb in each example isn't a great experience for developers. Once a dev decides they need web-sys or stdweb they don't want to browse example projects that are littered with code and cfg macros for the other platform. How about moving any example that depends on stdweb directly into a subfolder of examples called stdweb? We can follow up later with copying those examples to web-sys

Seems fine to keep examples that don't directly depend on stdweb as is though 👍

[daxpedda]

Done.

[daxpedda]

Rebased.

[jstarry]

Hey would you mind rebasing this again? I disabled check_examples in order to get CI green but this change should properly fix examples so please re-enable it in .travis.yml 👍

[daxpedda]

Hey would you mind rebasing this again? I disabled check_examples in order to get CI green but this change should properly fix examples so please re-enable it in .travis.yml 👍

Done.

[jstarry]

Really great job with this @daxpedda!!! Please rebase once the ReaderService change is merged. When CI is green, I'll merge since this is the last change 🎉

[daxpedda]

Done.