import script --> .esm

Guy Bedford guybedford at gmail.com
Wed Sep 10 11:02:55 PDT 2014


On 10 September 2014 19:18, John Barton <johnjbarton at google.com> wrote:

>
>
>
> On Wed, Sep 10, 2014 at 10:07 AM, Guy Bedford <guybedford at gmail.com>
> wrote:
>
>> The question of whether a file is a module or script is the same problem
>> as to whether a module is ES6 or AMD or CommonJS.
>>
>> Moving it to the extension makes as much sense as having every CommonJS
>> module written as `script.cjs`.
>>
>
> I don't think these are the same problem. Existing JS, AMD and CommonJS
> can be parsed by the same parser, the ES6 Script parser. They can't be
> parsed by the ES6 Module parser.  It is a problem, just not the same as
> this one.
>

>
>>
>> We know that we need outside metadata to work out how to interpret
>> modules, and that the loader will have meta-configuration injection at some
>> level, not determined by TC39.
>>
>
> One of the purposes of having modules in ES was to unify the module work
> in mode and browser. Having two or more incompatible meta-data solutions to
> this simple problem will defeat that goal.
>

Yes - we need to use meta-data solutions that can be cross-compatible.


>
>
>>
>> In NodeJS, this can be through `package.json` properties which inform
>> what module format the package is. In the browser, this could be a header,
>> or part of package configuration.
>>
>> John, in your case specifically, it would be good to get more background
>> to understand what type of meta process is most suitable.
>>
>
> What more can I say? Some files need to be parsed as Script and some as
> Module.   Sometimes they are in the same project and sometimes in the same
> directory.  They work on browser and node.
>

For Traceur, the default interpretation is as Module, so it sounds like you
want a way to indicate files which break this rule and need to be
interpreted as Script?

Can you give an example of a type of file this would apply to?


>
> jjb
>
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