diff --git a/ckeditor/ckeditor-tests.ts b/ckeditor/ckeditor-tests.ts
index 976b85717..523c2c515 100644
--- a/ckeditor/ckeditor-tests.ts
+++ b/ckeditor/ckeditor-tests.ts
@@ -251,4 +251,53 @@ function test_dom_window() {
     var size = win.getViewPaneSize();
     alert(size.width);
     alert(size.height);
-}
\ No newline at end of file
+}
+
+function test_adding_dialog_by_path() {
+    CKEDITOR.dialog.add( 'abbrDialog', this.path + 'dialogs/abbr.js' );
+}
+
+function test_adding_dialog_by_definition() {
+    CKEDITOR.dialog.add( 'abbrDialog', function ( editor: CKEDITOR.editor ) {
+        return {
+            title: 'Abbreviation Properties',
+            minWidth: 400,
+            minHeight: 200,
+
+            contents: [
+                {
+                    id: 'tab-basic',
+                    label: 'Basic Settings',
+                    elements: <any[]>[]
+                },
+                {
+                    id: 'tab-adv',
+                    label: 'Advanced Settings',
+                    elements: []
+                }
+            ]
+        };
+    });
+}
+
+function test_adding_plugin() {
+    CKEDITOR.plugins.add( 'abbr', {
+        icons: 'abbr',
+        init: function( editor: CKEDITOR.editor ) {
+            // empty logic
+        }
+    });
+}
+
+function test_adding_widget() {
+    function wrapper(editor: CKEDITOR.editor) {
+            editor.widgets.add("widgetty", {
+            button: "Activate widgetty",
+            template: "<imaginary-element>",
+            dialog: "widgetty",
+            init: function() {
+                // no logic
+            }
+        });
+    }
+}
diff --git a/ckeditor/ckeditor.d.ts b/ckeditor/ckeditor.d.ts
index a1bb1c481..491ae0157 100644
--- a/ckeditor/ckeditor.d.ts
+++ b/ckeditor/ckeditor.d.ts
@@ -614,11 +614,134 @@ declare module CKEDITOR {
 
 
         module widget {
-            class repository {
+            interface IWidget {
+                allowedContent: any;
+                button: string;
+                contentForms: Object;
+                contentTransformations: Object;
+                data: Function;
+                defaults: Object;
+                dialog: String;
+                downcast: any; // should be string | Function
+                downcasts: Object;
+                draggable: boolean;
+                editables: Object;
+                init: Function;
+                inline: Boolean;
+                insert: Function;
+                mask: Boolean;
+                name: String;
+                parts: Object;
+                pathName: string;
+                requiredContent: any;
+                styleToAllowedContentRules: Function;
+                styleableElements: string;
+                template: string;
+                upcast: any; // should be string | Function
+                upcasts: Object;
 
+                addClass(className: string): void;
+                applyStyle(style: any): void; // any should be CKEDITOR.style
+                capture(): void;
+                checkStyleActive(style: any): boolean; // any should be CKEDITOR.style
+                define(name: string, meta: {errorProof?: boolean}): void;
+                destroy(offline?: boolean): void;
+                destroyEditable(editableName:string, offline?: boolean): void;
+                edit(): boolean;
+                fire(eventName: string, data?: Object, editor?: editor): any; // should be boolean | Object
+                fireOnce(eventName: string, data?: Object, editor?: editor): any; // should be boolean | Object
+                focus(): void;
+                getClasses(): Object;
+                hasClass(className: string, Whether: boolean): void;
+                hasListeners(eventName: string): boolean;
+                initEditable(editableName: string, definition: any): boolean; // any should be CKEDITOR.plugins.widget.nestedEditable.definition
+                isInited(): boolean;
+                isReady(): boolean;
+                on(eventName: string, listenerFunction: Function,
+                    scopeObj: Object, listenerData: Object, priority: number): Object;
+                once(): void;
+                removeAllListeners(): void;
+                removeClass(className: string): void;
+                removeListener(evnetName: string, listenerFunction: Function): void;
+                removeStyle(style: any): void; // any should be CKEDITOR.style
+                setData(keyOrData: any, value?: Object): IWidget; // any should be string | Object
+                setFocused(selected: boolean): IWidget;
+                setSelected(selected: boolean): IWidget;
+                toFeature(): any; // should be CKEDITOR.feature
+                updateDragHandlerPosition(): void;
+            }
+
+            interface IWidgetDefinition {
+                allowedContent?: any;
+                button?: string;
+                contentForms?: Object;
+                contentTransformations?: Object;
+                data?: Function;
+                defaults?: Object;
+                dialog?: String;
+                downcast?: any; // should be string | Function
+                downcasts?: Object;
+                draggable?: boolean;
+                edit?: Function;
+                editables?: Object;
+                init?: Function;
+                inline?: Boolean;
+                insert?: Function;
+                mask?: Boolean;
+                name?: String;
+                parts?: Object;
+                pathName?: string;
+                requiredContent?: any;
+                styleToAllowedContentRules?: Function;
+                styleableElements?: string;
+                template?: string;
+                upcast?: any; // should be string | Function
+                upcasts?: Object;
+                toFeature?(): any; // should be CKEDITOR.feature
+            }
+
+            class repository {
+                add(name: string, widgetDef: IWidgetDefinition): void;
+                addUpcastCallback(callback: Function): void;
+                capture(): void;
+                checkSelection(): void;
+                checkWidgets(options?: {initOnlyNew?: boolean; focusInited?: boolean}): void;
+                define(name: string, meta?: {errorProof?: boolean}): void;
+                del(widget: IWidget): void;
+                destroy(widget: IWidget, offline?: boolean): void;
+                destroyAll(offline?: boolean): void;
+                finalizeCreation(container: any): void;
+                fire(eventName: string, data: Object, editor: editor): any; // should be boolean | Object
+                getByElement(element: any, checkWrapperOnly: boolean): IWidget;
+                hasListeners(eventName: string): boolean;
+                initOn(element: any, widgetDef?: IWidgetDefinition, startupData?: Object): IWidget;
+                initOnAll(container?: any): IWidget[];
+                on(eventName: string, listenerFunction: Function, scopeObj?: Object, listenerData?: Object, priority?: number): Object;
+                once(): void;
+                parseElementClasses(classes: string): Object;
+                removeAllListeners(eventName: string, listenerFunction: Function): void;
+                wrapElement(element: any, widgetName?: string): any;
             }
         }
 
+        interface IPluginDefinition {
+            hidpi?: boolean;
+            lang?: any; // should be string | string[]
+            requires?: any; // should be string | string[]a
+            afterInit?(editor: editor): any;
+            beforeInit?(editor: editor): any;
+            init?(editor: editor): any;
+            onLoad?(): any;
+        }
+
+        function add(name: string, definition?: IPluginDefinition): void;
+        function addExternal(name: string, path: string, fileName: string): void;
+        function get(name: string): any;
+        function getFilePath(name: string): string;
+        function getPath(name: string): string;
+        function load(name: string, callback: string, scope: any): void;
+        function setLang(pluginName: string, languageCode: string, languageEntries: any): void;
+
     }
 
 
@@ -963,4 +1086,35 @@ declare module CKEDITOR {
         addFocusable(element: CKEDITOR.dom.element, index: number): void;
     }
 
+    module tools {
+        var callFunction: Function;
+    }
+
+    module dialog {
+        interface IDialogDefinition {
+            buttons?: any[];
+            contents?: any[];
+            height?: number;
+            minHeight?: number;
+            minWidth?: number;
+            onCancel?: Function;
+            onLoad?: Function;
+            onOk?: Function;
+            onShow?: Function;
+            resizable?: number;
+            title?: string;
+            width?: number;
+        }
+
+        function add(name: string, path: string): void;
+        function add(name: string, dialogDefinition: IDialogDefinition): void;
+        function addIframe(name: string, title: string, minWidth: number,
+            minHeight: number, onContentLoad: Function, userDefinition: any): void;
+        function addUIElement(typeName: string, builder: Function): void;
+        function cancelButton(): void;
+        function exists(name: string): void;
+        function getCurrent(): void;
+        function isTabEnabled(editor: editor, dialogName: string, tabName: string): boolean;
+        function okButton(): void;
+    }
 }