first commit

wp-content/plugins/duplicate-page/js/duplicate_page.js

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+jQuery(window).on('load',function() {
+    jQuery('.dpmrs').delay(10000).slideDown('slow');
+});
+jQuery(document).ready(function () {
+    jQuery('.close_dp_help').on('click', function (e) {
+        var what_to_do = jQuery(this).data('ct');
+        var nonce = dt_params.nonce
+        jQuery.ajax({
+            type: "post",
+            url: dt_params.ajax_url,
+            data: {
+                action: "mk_dp_close_dp_help",
+                what_to_do: what_to_do,
+                nonce:nonce
+            },
+            success: function (response) {
+                jQuery('.dpmrs').slideUp('slow');
+            }
+        });
+    });
+});
+jQuery(document).ready(function() {
+    var admin_page_url = "options-general.php?page=duplicate_page_settings";
+    window.history.replaceState({}, document.title, admin_page_url);
+});
+jQuery(document).on('click', '.button-custom-dismiss', function(e) {
+    jQuery(this).parent().hide();
+})

wp-content/plugins/duplicate-page/js/editor-script.js

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+var el = wp.element.createElement;
+    var __ = wp.i18n.__;
+    var registerPlugin = wp.plugins.registerPlugin;
+    var PluginPostStatusInfo = wp.editPost.PluginPostStatusInfo;
+    var buttonControl = wp.components.Button;
+
+    function dpGutenButton({}) {
+        return el(
+            PluginPostStatusInfo,
+            {
+                className: 'dt-duplicate-post-status-info'
+            },
+            el(
+                buttonControl,
+                {
+                    isTertiary: true,
+                    name: 'duplicate_page_link_guten',
+                    isLink: true,
+                    title: dt_params.dp_post_title,
+                    href : dt_params.dp_duplicate_link+"&post="+dt_params.dp_post_id+"&nonce="+dt_params.dtnonce
+                }, dt_params.dp_post_text
+            )
+        );
+    }
+
+    registerPlugin( 'dt-duplicate-post-status-info-plugin', {
+        render: dpGutenButton
+    } );