Add Svelte support

[bdougherty]

Would be cool to have Svelte support. Happy to attempt a PR once 3.0 is final, assuming it will be accepted.

[mblarsen]

assuming it will be accepted

That depends on your PR as well :)

Go ahead. I would like Svelte (v3) support as well.

[asadm]

I would love to add support. One concerns:
Zero decides which handler/parser to send the file to based on the file extension ie. .jsx=> handler-react, .js=>handler-js etc. I wonder how we can differentiate between various js frameworks all saved as .js file. Maybe perform some AST?
This problem applies to supporting any other JS frameworks too.

[bdougherty]

@mblarsen ha yeah, I meant more if the project is open to adding additional framework support.

@asadm Svelte is going to officially use the .svelte extension soon (sveltejs/svelte#2067), so I don't think that will be an issue here. Previously .html was used, but I think it's reasonable to require .svelte for zero.

[asadm]

Great. I am happy to assist with this once the extension is supported.

[LukasOchmann]

What about an first-line comment like //react or //svelte ...and as a fallback using the file extension.
Also an //ignore would be possible this way.

[brucou]

Svelte 3 is released!!

[asadm]

Awesome! I will look into this soon if no one else does.

[asadm]

I just finished Svelte 3 support for zero. Docs. It's live in the latest stable!

[brucou]

That's awesome!!