Improve types and add bellStyle/bellSound

fixtures/typings-test/typings-test.ts

@@ -140,6 +140,8 @@ namespace methods_core {
       const r16: number = t.getOption('scrollback');
       const r17: [number, number] = t.getOption('geometry');
       const r18: (data: string) => void = t.getOption('handler');
+      const r19: string = t.getOption('bellSound');
+      const r20: string = t.getOption('bellStyle');
     }
     {
       const t: Terminal = new Terminal();
@@ -161,6 +163,11 @@ namespace methods_core {
       t.setOption('scrollback', 1);
       t.setOption('geometry', [1, 1]);
       t.setOption('handler', (data: string) => console.log(data));
+      t.setOption('bellSound', 'foo');
+      t.setOption('bellStyle', 'none');
+      t.setOption('bellStyle', 'visual');
+      t.setOption('bellStyle', 'sound');
+      t.setOption('bellStyle', 'both');
     }
   }
   namespace scrolling {

src/Terminal.ts

@@ -149,7 +149,7 @@ const DEFAULT_OPTIONS: ITerminalOptions = {
   cursorBlink: false,
   cursorStyle: 'block',
   bellSound: BellSound,
-  bellStyle: null,
+  bellStyle: 'none',
   scrollback: 1000,
   screenKeys: false,
   debug: false,

typings/xterm.d.ts

@@ -290,7 +290,7 @@ declare module 'xterm' {
      * Retrieves an option's value from the terminal.
      * @param key The option key.
      */
-    getOption(key: 'cursorStyle' | 'termName'): string;
+    getOption(key: 'bellSound' | 'bellStyle' | 'cursorStyle' | 'termName'): string;
     /**
      * Retrieves an option's value from the terminal.
      * @param key The option key.
@@ -322,7 +322,19 @@ declare module 'xterm' {
      * @param key The option key.
      * @param value The option value.
      */
-    setOption(key: 'cursorStyle' | 'termName', value: string): void;
+    setOption(key: 'termName' | 'bellSound', value: string): void;
+    /**
+     * Sets an option on the terminal.
+     * @param key The option key.
+     * @param value The option value.
+     */
+    setOption(key: 'bellStyle', value: 'none' | 'visual' | 'sound' | 'both'): void;
+    /**
+     * Sets an option on the terminal.
+     * @param key The option key.
+     * @param value The option value.
+     */
+    setOption(key: 'cursorStyle', value: 'block' | 'underline' | 'bar'): void;
     /**
      * Sets an option on the terminal.
      * @param key The option key.