Best way to override module values/constants in angularJS

Question

I have written a module in angularJS that encapsulates all the backend communications. For greater flexibility I have the api prefix as a constant value on the module (could be

Answer 1

Our module

angular.module("data", [])
  .constant('apiPrefix', '/api/data');

We can override constant fully, like value.

angular.module('myapp', ['data'])
  .constant('apiPrefix', '/api2/data');

also we can override fully in config

angular.module('myapp', ['data'])
    .config(function ($provide) {
        $provide.constant('apiPrefix', '/api2/data');
    });

also we can override fully or partially (if object) in run

angular.module('myapp', ['data'])
    .run(function (apiPrefix) {
        apiPrefix = '/api2/data';
    });

But if we want to override constant with object partially in config (not in run), we can do something like this

angular.module("module1", [])
    .constant('myConfig', {
        param1: 'value1' ,
        param2: 'value2'
    });

angular.module('myapp', ['data'])
    .config(function ($provide, myConfig) {
        $provide.constant(
            'myConfig', 
            angular.extend(myConfig, {param2: 'value2_1'});
        );
    });