On Fri, Sep 01, 2017 at 11:01:51AM -0400, Boris Zbarsky wrote:
Now that we control all the code that can attempt to touch
Components.interfaces.nsIDOM*, we can try to get rid of these
interfaces and their corresponding bloat.
The main issue is that we have consumers that use these for testing
what sort of object we have, like so:
if (obj instanceof Ci.nsIDOMWhatever)
and we'd need to find ways to make that work. In some cases various
hacky workarounds are possible in terms of property names the object
has and maybe their values, but they can end up pretty non-intuitive
and fragile. For example, this:
element instanceof Components.interfaces.nsIDOMHTMLEmbedElement
becomes:
element.localName === "embed" &&
element.namespaceURI === "http://www.w3.org/1999/xhtml";
One possibility that should work, but is slightly ugly:
if (ChromeUtils.getClassName(element) == "HTMLEmbedElement")
That has the unfortunate side-effect of allocating a new JS
string for every call, but we can probably optimize it if it
becomes necessary.
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