Angular Error handling

gistfile1.ts

    export function httpErrorHandler($httpProvider: ng.IHttpProvider) {
        var interceptor = ($q: ng.IQService) => {
                return {
                'requestError': response => {
                    toastr.error(response.message || response.statusText || "An error occured");
                    return $q.reject(response);
                },
                'responseError': response => {
                    var error = (response.data && response.data.errors) || response.statusText || "An error occured";

                    if (_.isArray(error)) {
                        if (error.length === 1)
                            error = error[0];
                        else
                            error = "<ul><li>" + error.join('</li><li>') + "</li></ul>";
                    }

                    toastr.error(error);
                    return $q.reject(response);
                }
            }
        }
        $httpProvider.interceptors.push(interceptor);
    };
    
.config(httpErrorHandler)