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Make the check for ZoneAwarePromise more stringent #495
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`resolvePromise` assumes that if a value is an `instanceof` ZoneAwarePromise then it has the properties "__zone_symbol__state" and "__zone_symbol__value" and it _is_ a true ZoneAwarePromise; however, a user can construct a value that breaks this assumption by inheriting from ZoneAwarePromise without actually having those properties or being a true ZoneAwarePromise (for example, by attempting to subclass Promise). We can fix this by adding checks for "__zone_symbol__state" and "__zone_symbol__value" to `resolvePromise`.
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For context, refer to the following GitHub issues and pull request: * #24 * angular/zone.js#494 * angular/zone.js#495 Ideally, we can add back the `inherits` call (if indeed this method of subclassing is correct) after Zone.js responds.
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Hi,
Here is my proposed fix for #494. I've opted to check for the properties "__zone_symbol__state" and "__zone_symbol__value". It just occurred to me that checking the
constructormight also work, but I am not sure. Commit message below.Thanks,
Mark
resolvePromiseassumes that if a value is aninstanceofZoneAwarePromise then it has the properties "__zone_symbol__state" and "__zone_symbol__value" and it is a true ZoneAwarePromise; however, a user can construct a value that breaks this assumption by inheriting from ZoneAwarePromise without actually having those properties or being a true ZoneAwarePromise (for example, by attempting to subclass Promise).We can fix this by adding checks for "__zone_symbol__state" and "__zone_symbol__value" to
resolvePromise.