Thanks, that makes sense.

On Thu, Oct 31, 2013 at 1:22 PM, Jason Orendorff
<jason.orendorff at gmail.com>wrote:

> `import *` delays full knowledge of what's in the import lexical scope
>  until link time.  (That is, you can't figure out scopes by looking at
> a module in isolation. You have to wait for its dependencies.)
>
>     import * from "stickers";
>     ...
>         y = r * Math.sin(a);
>     ...
>
> It is unclear whether `Math` refers to the global Math or to something
> imported from "stickers" at least until "stickers" is loaded.
>

You have to wait for "stickers" to load to validate the imports anyway.


>
> Similarly, `export * from` delays full knowledge of what's exported
> until link time. The practical difference is that a compiler can
> benefit from having static scope information up front. Exports really
> are not needed until link time.
>

But it has a similar issue. You cannot look at a module in isolation and
know what it exports.

-- 
erik
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Thanks, that makes sense.

On Thu, Oct 31, 2013 at 1:22 PM, Jason Orendorff <jason.orendorff at gmail.com> wrote:

> `import *` delays full knowledge of what's in the import lexical scope
>  until link time.  (That is, you can't figure out scopes by looking at
> a module in isolation. You have to wait for its dependencies.)
>
>     import * from "stickers";
>     ...
>         y = r * Math.sin(a);
>     ...
>
> It is unclear whether `Math` refers to the global Math or to something
> imported from "stickers" at least until "stickers" is loaded.

You have to wait for "stickers" to load to validate the imports anyway.


> Similarly, `export * from` delays full knowledge of what's exported
> until link time. The practical difference is that a compiler can
> benefit from having static scope information up front. Exports really
> are not needed until link time.

But it has a similar issue. You cannot look at a module in isolation and
know what it exports.