Not able to override collapsible.js in magento 2

var config = {
    "map": {
        "*": {
            "mage/collapsible": "js/collapsible-custom"
        }
    }
};

define([
    'jquery',
    'jquery/ui'
], function ($, wrapper) {
    'use strict';

    return function(target) {
        $.widget("mage.myCollapsible", target, {
            activate: function () {
               if (!this.options.disabled) {
                   if (this.options.animate) {
                       this._animate(showProps);
                   } else {
                      // custom code goes here ...
                      this.content.show();
                   }
                   this._open();
               }

               // Or:
               // this._super();
               // if (!this.options.disabled) { .. custom code .. }
            }
        });
    };
});

var config = {
    config: {
        mixins: {
            'mage/collapsible': {
                'mage/my-collapsible-mixin': true
            }
        }
    }
};

define([
    'jquery'
], function ($) {
    'use strict';

    return function(widget) {
        $.widget('mage.collapsible', widget, {
            activate: function () {
               if (!this.options.disabled) {
                   if (this.options.animate) {
                       this._animate(showProps);
                   } else {
                      // custom code goes here ...
                      this.content.show();
                   }
                   this._open();
               }
            }
        });

        return $.mage.collapsible;
    };
});

var config = {
    config: {
        mixins: {
            'mage/collapsible': {
                'Vendor_Modulename/js/lib/mage/collapsible-mixin': true
            }
        }
    }
};

define([
    'jquery'
], function ($) {
   'use strict';
    return function(originalWidget) {
        $.widget('mage.collapsible', $.mage.collapsible, {
            _scrollToTopIfNotVisible: function () {
                console.log('Mixin Loaded');
            }
        });
        return $.mage.collapsible;
    };
});