Add IAnsiColorChangeEvent type

src/common/Types.d.ts

@@ -328,6 +328,16 @@ export interface IWindowOptions {
   setWinLines?: boolean;
 }
 
+/**
+ * Event fired for OSC 4 command - to change ANSI color based on its index.
+ */
+export interface IAnsiColorChangeEvent {
+  colorIndex: number;
+  red: number;
+  green: number;
+  blue: number;
+}
+
 /**
  * Calls the parser and handles actions generated by the parser.
  */