Add an implementation for `JSValueEncoder`

[MaxDesiatov]

Do I understand correctly that there's no easy way right now to convert an arbitrary Encodable type to JSValue? We already have JSValueDecoder, but apparently lack the opposite for Encodable...

[jhoughjr]

What all would this entail? I assume an inverse of the decoding method?

[MaxDesiatov]

Yes, I would assume so, but it may need some investigation to confirm this.

[jhoughjr]

Ive discovered a bug it seems that might relate to this issue.

working with Request and Fetch apis.
long story short no matter what body I send to my server, JavaScriptKit seems to ensure it is the string literal [object Object] even if I give it my own string literal.
Thats not a log output either, its the decode utf8 data on the request at the server.

I tested this by setting body to a JSValue(stringLiteral: ) of the exact json body I wanted.
What does my served decode the 15 bytes as [object Object]
This is the exact same output as body = body.description
info is available for the last few days in the tokamak channel.

So if it cant send the body I tell it to, Encoding won't matter cuz it will just encode the literal string "[object Object]"

[ephemer]

@kateinoigakukun @j-f1 FYI I have created an implemention of JSValueEncoder. I can make a PR soon – just testing it some more first with some more use-cases.

[ephemer]

I just saw this issue and noticed I didn't follow up: the JSValueEncoder implementation I was referring to is in https://github.com/swiftwasm/WebWorkerKit/blob/main/Sources/WebWorkerKit/JSValueEncoder.swift – it's definitely not perfect but maybe enough for people to work with if needed