fix: export default in namespace #2200

[technohippy]

⯈fix: #2200

Now the same error message as TS is used.

• I've read the contributing guidelines
• I've added my name and email to the NOTICE file

[romdotdog]

As mentioned in the source issue, I think changing the message for this error could be beneficial, wdyt? Do you think it's confusing? cc: @dcodeIO

[dcodeIO]

I guess the reference to "ECMAScript-style module" can be dropped, as this is all AS supports anyway. Perhaps: "A default export can only be used in a module." Still about the same message, but less over-precise.

Another thought: I wonder that a NodeKind.EXPORT even ends up in namespace initialization. Seems brittle. Can this perhaps be checked during parsing already, not appending the export in this place?

[romdotdog]

I was thinking something more like A default export cannot be used in a namespace. or maybe even better A default export can only be used in the top level. unless there is another case where they can be used?

[technohippy]

TS1258: A default export must be at the top level of a file or module declaration. may be the one we want.

[romdotdog]

I don't think AS supports default exports in modules yet, but I'm not sure if that's an upcoming feature.

[technohippy]

hmm... I choose A default export can only be used in a module. for now. Anyone can change this anytime.

[technohippy]

@dcodeIO Test / Bootstrap throws a strange error now. npm run bootstrap can run on my local env. Do you have any idea?

TypeError: WebAssembly.compileStreaming is not a function
    at file:///home/runner/work/assemblyscript/assemblyscript/build/assemblyscript.debug.js:2[23](https://github.com/AssemblyScript/assemblyscript/runs/6088770012?check_suite_focus=true#step:6:23)3:21
    at file:///home/runner/work/assemblyscript/assemblyscript/build/assemblyscript.debug.js:2238:3
    at ModuleJob.run (node:internal/modules/esm/module_job:198:25)
    at async Promise.all (index 0)
    at async ESMLoader.import (node:internal/modules/esm/loader:409:[24](https://github.com/AssemblyScript/assemblyscript/runs/6088770012?check_suite_focus=true#step:6:24))
    at <anonymous> (/home/runner/work/assemblyscript/assemblyscript/cli/index.js:47:20)

[romdotdog]

Only one thing on the logs caught my eye: the newly released Node v18.0.0 was used as opposed to the first run which used Node v17.9.0. Needs further testing.

[dcodeIO]

Fixed the CI error in #2274. Merging main should resolve the error in this PR as well.

[technohippy]

@dcodeIO Thanks. Now all checkes have passed.

[technohippy]

@dcodeIO Thanks. Now all checkes have passed.

[dcodeIO]

Thanks!