Github user omefire commented on a diff in the pull request:

    https://github.com/apache/cordova-lib/pull/223#discussion_r30792008
  
    --- Diff: cordova-lib/src/cordova/platform.js ---
    @@ -122,6 +122,12 @@ function addHelper(cmd, hooksRunner, projectRoot, 
targets, opts) {
                             if (platformAlreadyAdded) {
                                 throw new CordovaError('Platform ' + platform 
+ ' already added.');
                             }
    +
    +                        // Remove the <platform>.json file from the 
plugins directory, so we start clean (otherwise we
    +                        // can get into trouble not installing plugins if 
someone deletes the platform folder but
    +                        // <platform>.json still exists).
    +                        removePlatformPluginsJson(projectRoot, target);
    --- End diff --
    
    I think this function call should be moved to 
https://github.com/MSOpenTech/cordova-lib/blob/CB-9051/cordova-lib/src/cordova/platform.js#L174,
 because the 'addHelper' function is used both by the 'cordova platform add' 
and 'cordova platform update'. and it is our intention to only do this file 
deletion when we are performing an 'add' operation.
    Another reason might be that we should be doing this file deletion close to 
the 'installPluginsForTheNewPlatform' function call, to minimize the risk of 
getting in an inconsistent state where the file has already been deleted even 
though the 'add' operation ends up throwing an exception down the line.


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