diff --git a/typings/xterm.d.ts b/typings/xterm.d.ts
index dd08b55e7b..a27c26bf00 100644
--- a/typings/xterm.d.ts
+++ b/typings/xterm.d.ts
@@ -13,6 +13,16 @@ declare module 'xterm' {
    */
   export type FontWeight = 'normal' | 'bold' | '100' | '200' | '300' | '400' | '500' | '600' | '700' | '800' | '900';
 
+  /**
+   * A string representing the bell style.
+   */
+  export type BellStyle = 'none' /*| 'visual'*/ | 'sound' /*| 'both'*/;
+
+  /**
+   * A string representing the cursor style style.
+   */
+  export type CursorStyle = 'block' | 'underline' | 'bar';
+
   /**
    * An object containing start up options for the terminal.
    */
@@ -31,7 +41,7 @@ declare module 'xterm' {
     /**
      * The type of the bell notification the terminal will use.
      */
-    bellStyle?: 'none' /*| 'visual'*/ | 'sound' /*| 'both'*/;
+    bellStyle?: BellStyle;
 
     /**
      * The number of columns in the terminal.
@@ -46,7 +56,7 @@ declare module 'xterm' {
     /**
      * The style of the cursor.
      */
-    cursorStyle?: 'block' | 'underline' | 'bar';
+    cursorStyle?: CursorStyle;
 
     /**
      * Whether input should be disabled.
@@ -504,19 +514,19 @@ declare module 'xterm' {
     * @param key The option key.
     * @param value The option value.
     */
-    setOption(key: 'fontWeight' | 'fontWeightBold', value: null | 'normal' | 'bold' | '100' | '200' | '300' | '400' | '500' | '600' | '700' | '800' | '900'): void;
+    setOption(key: 'fontWeight' | 'fontWeightBold', value: null | FontWeight): void;
     /**
      * Sets an option on the terminal.
      * @param key The option key.
      * @param value The option value.
      */
-    setOption(key: 'bellStyle', value: null | 'none' | 'visual' | 'sound' | 'both'): void;
+    setOption(key: 'bellStyle', value: null | BellStyle): void;
     /**
      * Sets an option on the terminal.
      * @param key The option key.
      * @param value The option value.
      */
-    setOption(key: 'cursorStyle', value: null | 'block' | 'underline' | 'bar'): void;
+    setOption(key: 'cursorStyle', value: null | CursorStyle): void;
     /**
      * Sets an option on the terminal.
      * @param key The option key.
@@ -548,12 +558,10 @@ declare module 'xterm' {
      */
     setOption(key: 'theme', value: ITheme): void;
     /**
-     * Sets an option on the terminal.
+     * Retrieves an option's value from the terminal.
      * @param key The option key.
-     * @param value The option value.
      */
-    setOption(key: string, value: any): void;
-
+    setOption(key: 'cols' | 'rows', value: number): void;
     /**
      * Tells the renderer to refresh terminal content between two rows
      * (inclusive) at the next opportunity.