condense data parser in event parser

src/sse-event-parser.ts

@@ -165,18 +165,7 @@ export class SSEEventParser {
 
     switch (field) {
       case "data":
-        // If this is NOT the first time we are adding a data line, this will be an empty string and we will add a new line.
-        if (event.data !== undefined) {
-          event.data += NEW_LINE;
-        }
-
-        // If event.data hasnt been defined yet, set it to an empty string.
-        event.data ??= "";
-
-        // Add the value to the event.data
-        event.data += value;
-
-        // event.data = event.data !== undefined ? `${event.data}${NEW_LINE}${value}` : value;
+        event.data = event.data !== undefined ? `${event.data}${NEW_LINE}${value}` : value;
 
         return;