Support ExportSpecifier defined stories

[i-am-the-slime]

This is in response to #554

In my local testing it works, however it only works for the first story in the export list, is this what we want?
Otherwise I could probably loop but the code would be a bit more involved.

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[tajo]

In my local testing it works, however it only works for the first story in the export list, is this what we want?

It should definitely work for multiple stories/specifiers. Also, tests need to be added.

This is an interesting case:

const joe = 'joe';

export { joe, joe as jim }

Should parse outjoe and jim

[i-am-the-slime]

@tajo

It now

• parses all stories in the block
• uses the exported name if there is one
• has a test for this

It doesn't resolve the original AST node of what's being exported so it misses the "function/class/variable" check.
I don't know how to do that. I hope it's okay even without this check.

[i-am-the-slime]

@tajo Could you have another look, please?

[tajo]

lgtm

[i-am-the-slime]

lgtmt