system module loader

David Herman dherman at mozilla.com
Thu Mar 8 11:01:20 PST 2012


On Mar 8, 2012, at 9:27 AM, Mike Samuel wrote:

> http://wiki.ecmascript.org/doku.php?id=harmony:module_loaders mentions
> a system module loader.
> 
> Has the behavior of the system module loader been speced at all?

Not really. The plan is to leave it mostly unspecified; it's sort of the "Pineal gland" of ES6 [1], so most of the questions of how it interacts with the host environment and what extra built-ins are in its global object are, as usual, up to the implementation.

> If not, would it be worthwhile specifying that when it loads an http
> or https URL, it does so with a fairly minimal Accept header that
> excludes non-script mime-types, especially text/html and */*:
> 
>    Accept: application/javascript;version=next, application/javascript
> 
> or whichever is the preferred mime-type.
> 
> Such a hint might be of use to application frameworks like RoR that
> have a translation pipeline so that when the accept header does not
> include application/javascript;version=next then they can try and
> desugar to ES5, but when the user-agent does, they can deliver
> individual modules with spiffy new features.

Great idea! I like it.

Dave

[1] http://en.wikipedia.org/wiki/Ren%C3%A9_Descartes#Dualism



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