diff --git a/.npmignore b/.npmignore
index b639079..055fe28 100644
--- a/.npmignore
+++ b/.npmignore
@@ -2,5 +2,6 @@
 *
 
 # except the lib and src files
+!index.d.ts
 !lib/**/*
 !src/**/*
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..1303357
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,200 @@
+
+export interface IHandorgelOptions {
+
+  /**
+   * Whether multiple folds can be opened at once
+   */
+  multiSelectable: boolean,
+
+  /**
+   * Whether the folds are collapsible
+   */
+  collapsible: boolean,
+
+  /**
+   * Whether ARIA attributes are enabled
+   */
+  ariaEnabled: boolean,
+
+  /**
+   * Whether W3C keyboard shortcuts are enabled
+   */
+  keyboardInteraction: boolean,
+
+  /**
+   * Whether to loop header focus. Sets focus back
+   * to first/last header when end/start reached.
+   */
+  carouselFocus: boolean,
+
+  /**
+   * attribute for the header or content to open folds at initialization
+   */
+  initialOpenAttribute: string,
+
+  /**
+   * Whether to use transition at initial open
+   */
+  initialOpenTransition: boolean,
+
+  /**
+   * Delay used to show initial transition
+   */
+  initialOpenTransitionDelay: number,
+
+  /**
+   * Header class if fold is open
+   */
+  headerOpenClass: string,
+
+  /**
+   * Content class if fold is open
+   */
+  contentOpenClass: string,
+
+  /**
+   * Header class if fold has been opened (transition finished)
+   */
+  headerOpenedClass: string,
+
+  /**
+   * Content class if fold has been opened (transition finished)
+   */
+  contentOpenedClass: string,
+
+  /**
+   * Header class if fold has been focused
+   */
+  headerFocusClass: string,
+
+  /**
+   * Content class if fold has been focused
+   */
+  contentFocusClass: string,
+
+  /**
+   * Header class if fold is disabled
+   */
+  headerDisabledClass: string,
+
+  /**
+   * Content class if fold is disabled
+   */
+  contentDisabledClass: string,
+
+}
+
+export interface IFolds {
+
+  /**
+   * Open content.
+   */
+  open(transition?: boolean):void
+
+  /**
+   * Close content.
+   */
+  close(transition?: boolean):void
+
+  /**
+   * Toggle content.
+   */
+  toggle(transition?: boolean):void
+
+  /**
+   * Disable fold.
+   */
+  disable(): void
+
+  /**
+   * Enable fold.
+   */
+  enable(): void
+
+  /**
+   * Set focus to fold button.
+   */
+  focus(): void
+
+  /**
+   * Remove focus from fold button.
+  */
+  blur(): void
+
+  /**
+   * Remove event listeners and ARIA attributes.
+   */
+  destroy(): void
+}
+
+export type IEvents = (
+
+  /** Accordion is about to be destroyed */
+  | 'destroy'
+
+  /** Accordion has been destroyed. */
+  | 'destroyed'
+
+  /** Fold is about to be opened. */
+  | 'fold:open'
+
+  /** Fold has opened. */
+  | 'fold:opened'
+
+  /** Fold is about to be closed */
+  | 'fold:close'
+
+  /** Fold has closed. */
+  | 'fold:closed'
+
+  /** Fold button has been focused. */
+  | 'fold:focus'
+
+  /** Fold button has lost focus. */
+  | 'fold:blur'
+)
+
+export class IHandorgel {
+
+  constructor(selector: Element, options?: IHandorgelOptions)
+
+  /**
+   * Update fold instances - Use if you dynamically append/remove DOM nodes.
+   */
+  public update(): void
+
+  /**
+   * Set focus to a new header button. You can also directly
+   * use the native `focus()` method on the button).
+   */
+  public focus(target: 'next' | 'previous' | 'last' | 'first'): void
+
+  /**
+   * Destroy fold instances, remove event listeners and ARIA attributes.
+   */
+  public destroy(): void
+
+  /**
+   * Event Listener
+   */
+  public on(events: IEvents, fn?:(fold: IFolds) => void): void
+
+  /**
+   * Event Listener
+   */
+  public once(events: IEvents, fn?:(fold: IFolds) => void): void
+
+  /**
+   * Event Listener (OFF)
+   */
+  public off(events: IEvents, fn?:(fold: IFolds) => void): void
+
+  /**
+   * Panel Folds
+   */
+  public folds: IFolds[]
+
+}
+
+export default class Handorgel extends IHandorgel {}
+
diff --git a/package.json b/package.json
index 1866bb5..f3a99a4 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
   "main": "lib/js/umd/handorgel.js",
   "module": "lib/js/esm/handorgel.js",
   "jsnext:main": "lib/js/esm/handorgel.js",
+  "types": "index.d.ts",
   "repository": {
     "type": "git",
     "url": "https://github.com/oncode/handorgel.git"
@@ -15,6 +16,13 @@
     "accessible"
   ],
   "author": "Manuel Sommerhalder",
+  "contributors": [
+    {
+      "name": "Nikolas Savvidis",
+      "email": "n.savvidis@gmx.com",
+      "url": "https://github.com/panoply"
+    }
+  ],
   "license": "MIT",
   "scripts": {
     "build": "run-s compile minify",