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https://issues.apache.org/jira/browse/CB-12218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15726121#comment-15726121
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Alan Kinzie commented on CB-12218:
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Actually, I don't think it should convert null to the string "null" either.
Neither bridge mode currently does it that way, and it has the same problem as
the empty string with the loss of information (the native callback sending null
would be indistinguishable from the native callback sending "null").
I encountered this inconsistency while working on a proprietary plugin which
unfortunately I can't share. If you want, I could try and see if I can find a
case with an official Cordova plugin where this inconsistency is apparent.
> inconsistent null handling between EVAL and ONLINE bridge modes
> ---------------------------------------------------------------
>
> Key: CB-12218
> URL: https://issues.apache.org/jira/browse/CB-12218
> Project: Apache Cordova
> Issue Type: Bug
> Components: Android
> Affects Versions: 6.0.0
> Environment: Android
> Reporter: Alan Kinzie
>
> If the Android native code invokes the success callback like this:
> callbackContext.success(null);
> then the value given to the javascript callback changes depending on the
> bridge type used.
> If the ONLINE_EVENT type is used, then null will be passed to the javascript
> callback.
> ie: if result is the parameter of the javascript success callback then
> result === null // will be true
> result === "" // will be false
> If the EVAL_BRIDGE type is used, then an empty string will be passed to the
> javascript callback.
> ie: if result is the parameter of the javascript success callback then
> result === null // will be false
> result === "" // will be true
> The value of the parameter given to the success callback should not change
> depending on the bridge type. Since ONLINE_EVENT was the default before
> cordova android 6.0.0, I am inclined to think the ONLINE bridge is doing the
> correct behaviour. Also, converting null to an empty string loses
> information. Therefore I think the EVAL mode should to be changed to be
> consistent with the ONLINE mode.
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