What could be the reason my Angular interceptor isn't minified correctly?

I have come across this interceptor in my Angular project:

angular.module('dwExceptionHandler', [])
    .factory('ExceptionInterceptor', ['$q', function ($q) {
        return function (promise) {
            return promise.then(
                function (response) {
                    if (response && response.data.Exception) {
                        alert(response.data.Exception.Message);

                        return $q.reject(response);
                    }

                    return response;
                },
                function (response) {
                    if (response.data.Exception) {
                        console.warn('ALERT', response.data.Exception.Message);
                        alert(response.data.Exception.Message.replace(/\\n/g, '\n'));
                    }

                    return $q.reject(response);
                });
        };
    }]).config(["$httpProvider", function ($httpProvider) {
        $httpProvider.responseInterceptors.push('ExceptionInterceptor');
    }]);

Despite expecting an alert due to receiving an exception from the server, the alert is not displayed. Strangely it does show up in the development environment without minification.

Upon inspecting the minified code snippet, I noticed it looks like this:

angular.module("dwExceptionHandler",[]).factory("ExceptionInterceptor",["$q",function(n)
{
    return function(t){
        return t.then(function(t)
            {
                return 
                    t && t.data.Exception 
                        ? (alert(t.data.Exception.Message),n.reject(t))
                        : t
            },
            function(t)
            {
                return t.data.Exception 
                        && 
                        (   console.warn("ALERT",t.data.Exception.Message),
                            alert(t.data.Exception.Message.replace(/\\n/g,"\n"))),
                            n.reject(t)
            })
        }}])

        .config(["$httpProvider",function(n){n.responseInterceptors.push("ExceptionInterceptor")}]);

It appears that both the promise and response variables are being assigned the same variable t during minification.

I am seeking guidance on how to address this issue. Unfortunately, I am constrained by using the .NET Bundle configuration and cannot switch to grunt, gulp, or use web essentials as per restrictions. How can I resolve this situation?

Answer №1

Even though the variable names are identical, they actually represent different variables. The minifier recognized that the promise variable was not utilized within your error callback, allowing it to reuse the same variable name for the function's parameter. This effectively conceals the other variable, rendering it inaccessible within the function. However, since you do not utilize the variable in that context, this should not impact your results.

In essence, the minification process should not be causing any issues with your code execution. It seems to be correct, and you may need to investigate other aspects to determine why you are not achieving the desired outcome.

If you wish to view the minified code using a distinct variable name, one technique is to trick the minifier into thinking that you are using the promise variable by including a line like the following in the callback method:

angular.noop(promise);

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