Module naming and declarations

Sam Tobin-Hochstadt samth at
Tue May 7 13:47:37 PDT 2013

On Tue, May 7, 2013 at 4:33 PM, Anne van Kesteren <annevk at> wrote:
> On Tue, May 7, 2013 at 1:22 PM, Sam Tobin-Hochstadt <samth at> wrote:
>> On Tue, May 7, 2013 at 4:01 PM, Anne van Kesteren <annevk at> wrote:
>>> How is that not treating it as a URL with a dose of magic by default?
>>> E.g. import "" will work given
>>> the way things are defined now. Similarly if I put jquery in root
>>> import "/jquery-1.9.1.min" will always work, regardless of location.
>>> This might not be how things are intended to be used, but I'd expect
>>> to see this kind of usage.
>> Using an absolute URL (as in your first example) opts out of any
>> processing. Otherwise it wouldn't work, of course -- adding the
>> baseURL would break that URL.
> "Adding"? What's the actual processing model for the default loader
> here? I thought it was:
>  1. Append ".js" to module name.
>  2. Use the URL parser to parse module name relative to base URL.
>  3. Fetch result of that operation.

The actual processing model is:

1. Produce a string that is, roughly, System.baseURL + moduleName + ".js".
2. Pass that to the fetch hook (which by default fetches that URL).

>> In the second case, what is the complain? That's a reasonable module name.
> If that's reasonable you might as well not add ".js" by default and
> require that to be specified if people want that. (Tying file
> extensions to content is dubious in a web context in general.)

It's reasonable in the sense that we aren't disallowing it.  It's a
bad idea because it's bad for coordination.

>> The whole point of my original email to Andreas is that this doesn't
>> work.  These names are *not* intended to specify where to find the
>> resource.  They *are* intended to be names that different modules can
>> coordinate with.  Should backbone put `import "/js/jquery.js"` in
>> their source file?
> If backbone has its own loader and everything it doesn't really matter
> what the default semantics are.

I no longer know what you're talking about.  Why would backbone have
it's own loader? If you're using a page with multiple libraries that
depend on jquery, you need a way for them all to use the same jquery.
That's the point of giving it a well-known name, like "jquery". This
is similar to the way you'd use AMD for this. Please go back and read
the email I mentioned.


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