无法读取undefined的属性'construct'

Question

var Company;
(function (Company) {
    var companyApp = angular.module('company', ['ngRoute', 'ngResource']);
    companyApp.constant('servicePath', Company.PathHelper.construct(''));
    companyApp.config(Company.HomeConfig);
    companyApp
        .controller('employeeController', Company.EmployeeController)
        .factory('employeeResource', Company.employeeFactory)
        .controller('departmentController', Company.DepartmentController)
        .factory('departmentResource', Company.departmentFactory);
})(Company || (Company = {}));

任何人都可以帮助我为什么我会在线上获得下一个错误

companyApp.constant('servicePath', Company.PathHelper.construct(''));

未捕获的TypeError：无法读取未定义的属性“construct”

我的PathHelper：

  var Company;
(function (Company) {
    var PathHelper = (function () {
        function PathHelper() {
        }
        PathHelper.construct = function (virtualPath) {
            return location.protocol + '//' + location.host + '/' + virtualPath;
        };
        return PathHelper;
    })();
    Company.PathHelper = PathHelper;
})(Company || (Company = {}));