Re: [heycam/webidl] Stop using extended attributes for constructors (#700)

annevk commented on this pull request.

Thanks for pushing this! I think we should wait with merging this until we have support on wpt/bikeshed, implementers are on board, and we have some number of specification PRs for this (I can help a bit next week). That seems preferable to slowly changing these things as then it might end up taking a long time for a full transition with lots of (costly) hiccups along the way.

> @@ -2540,6 +2542,82 @@ in which case the [=default toJSON operation=] is exposed instead.
 </div>
 
 
+<h4 id=idl-constructors oldids="Constructor" dfn>Constructor methods</h4>
+
+If an [=interface=] has a [=constructor method=] member (matching
+<emu-nt><a href="#prod-Constructor">Constructor</a></emu-nt>), it indicates that it is possible to
+create objects that [=implement=] the [=interface=] using a [=constructor=].
+
+Multiple [=constructor methods=] may appear on a given [=interface=].
+For each [=constructor method=] on the [=interface=], there will be a way to construct an instance

might be* (it could throw)

> +        interface Circle {
+          constructor();
+          constructor(double radius);
+          attribute double r;
+          attribute double cx;
+          attribute double cy;
+          readonly attribute double circumference;
+        };
+    </pre>
+
+    An ECMAScript implementation supporting these interfaces would have a \[[Construct]] property
+    on the <code class="idl">Circle</code> interface object which would return a new object that
+    [=implements=] the interface.
+    It would take either zero or one argument.
+    The <code class="idl">NodeList</code> interface object would not have a \[[Construct]]
+    property.

I thought it would have a throwing one? And the way we'd explain how an implementation was able to create it was by passing some magical token.

>  The [{{NoInterfaceObject}}] extended attribute
 must not be specified on an interface that has any
-[=static operations=] defined on it.
+[=constructors=] or [=static operations=] defined on it.
+
+Note: Combining the [{{NoInterfaceObject}}] and [{{NamedConstructor}}] extended attribute is not
+forbidden, however.

Hmm, maybe it should be? I guess that would be a separate change.

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