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"converting to an ECMAScript value" needs to take a realm, at least sometimes #371

domenic opened this issue Jun 21, 2017 · 3 comments


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domenic commented Jun 21, 2017

E.g. if you convert a sequence<DOMString> to an array, you need to specify the realm/global in which the conversion happens.

Related: w3ctag/promises-guide#52 (comment)

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So for the uses in the IDL spec itself, there is always a current Realm, I believe.

But I agree, for uses from other specs something needs to happen.

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Is there a way to find out which specs call the "convert to an ECMAScript value" algorithm, other than Web IDL itself?

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bzbarsky commented Dec 4, 2017

Not trivially.

You could look for specs that have object or any (or sequences thereof) return values. And specs with Promise<sequence<something>> return values. And so on....

It's not even trivial to tell from implementations, I suspect. In Gecko promises will automatically pick a global based on various criteria when you resolve them with something...

That said, a non-exhaustive list (just Promise<sequence<*>> bits, not all of which actually invoke the WebIDL algorithm) is:

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