Calling .hasOwnProperty("source") in Clojurescript's string/replace will break with ES6
Description
The "replace" function in string.cljs identifies RegExp objects by calling .hasOwnProperty to check for the "source" property. If true, then it's a regex. However, in ES6, the "source" property will become part of the RegExp prototype and not the actual object, so .hasOwnProperty("source") will return false instead.
To fix the issue, the Javascript "in" operator would work, if there's a way to compile cljs to use it. Otherwise, the next best thing might be to check to see if the "source" property is non-nil. Basically, the test:
(.hasOwnProperty match "source")
could become:
(.-source match)
It's not a major code change at all, but I'm happy to provide a patch and verify tests if you prefer.
Environment
Firefox Developer Edition Mac OS X 10.10.1 Clojurescript 0.0-2913 (but I checked, and it's still present in current master branch)
The "replace" function in string.cljs identifies RegExp objects by calling .hasOwnProperty to check for the "source" property. If true, then it's a regex. However, in ES6, the "source" property will become part of the RegExp prototype and not the actual object, so .hasOwnProperty("source") will return false instead.
Documentation on the RegExp change is at http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/source under the "Specifications" section. The change hit Firefox two weeks ago, according to this bug report, https://bugzilla.mozilla.org/show_bug.cgi?id=1120169, so it will still be 2-3 months before it appears in the main release channel. But given that ES6 is aiming for a June release date, we should expect other browsers to show this error soon enough.
To fix the issue, the Javascript "in" operator would work, if there's a way to compile cljs to use it. Otherwise, the next best thing might be to check to see if the "source" property is non-nil. Basically, the test:
(.hasOwnProperty match "source")
could become:
(.-source match)
It's not a major code change at all, but I'm happy to provide a patch and verify tests if you prefer.