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Add a module initializer

Describes the module initializer in Optimizely Content Management System (CMS).

A module initializer is a JavaScript function that is run when the related module is started. This is useful for doing any configuration or script loading that should be done before the edit user interface is made available.

The initializer is configured in the module.config file for your add-on. The initializer attribute on
the clientModule element determines the path to the module initializer to run. For example:

<clientModule initializer="acme/Initializer">

The module initializer should return an object that has an initialize function. This is the function that will be called when the module initializer is run. We recommend that you extend epi/_Module when implementing a module initializer as this implements the expected API and also provides helper methods for performing common initializer actions. So the skeleton for your module initializer will look something like this:

           function (declare, _Module) {
             return declare([_Module], {
               initialize: function () {