As of today, the syntax for Web IDL constructors no longer involves an
extended attribute on the interface. There's now something that looks
more like a method named "constructor" with no explicitly-defined return
type.
So this:
[Constructor(DOMString str)]
interface MyInterface {};
is now written like so:
interface MyInterface {
constructor(DOMString str);
};
This means we can now specify extended attributes on the constructor,
and therefore we no longer assume that all constructors throw. If yours
does, you can use [Throws] in the usual way to indicate that:
interface ThrowingConstructor {
[Throws] constructor();
};
It may take some time for specifications to update to the new syntax
because not all of the tooling is updated yet; see
https://github.com/heycam/webidl/issues/778 which tracks that. So in
the meantime, including new spec IDL that uses constructors may require
some hand-editing to get it into the new form.
-Boris
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