javascript - angular.identity is undefined -


i'm trying use following...

.withhttpconfig({transformrequest: angular.identity})

but undefined not function not seems know angular.identity is. can help?

full code:

angular.module('app.controllers.project', [     "app.factories.storage",     "app.factories.http",     "app.directives.typeahead",     "app.directives.projectdisplay",     "toaster"   ])       .controller("projectcontroller", ['$scope', '$rootscope', "$location",         "httpfactory", "filterservice", "$stateparams", "toaster",         function ($scope, $rootscope, $location, httpfactory, filterservice, $stateparams, toaster) {              var createproject = function () {                    var resource = httpfactory                     .withhttpconfig({transformrequest: angular.identity})                     .post("project", data, {}, {'content-type': undefined})                     .then(function () {                         // on success                         console.log("done")                     }, function () {                         // on failure                          console.log("error")                     }); etc

angular.identiy simple function returns arguments.

here source code of it: https://github.com/angular/angular.js/blob/master/src/angular.js#l379

what happens if change code from

.withhttpconfig({transformrequest: angular.identity})

to

.withhttpconfig({transformrequest: function(arg) { return arg; } })

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