Bug/97623 empty message fix

src/matcher.ts

@@ -12,7 +12,7 @@ import {
 	AdaptiveCard,
 } from "./messages";
 import { IWebchatConfig } from "./messages/types";
-import { getChannelPayload } from "./utils";
+import { getChannelPayload, isOnlyEscapeSequence } from "./utils";
 import { IMessage, IWebchatTemplateAttachment } from "@cognigy/socket-client";
 import { IAdaptiveCardMessage } from "@cognigy/socket-client/lib/interfaces/messageData";
 import { XAppSubmitMessage } from "./messages/xApp";
@@ -183,13 +183,14 @@ const defaultConfig: MatchConfig[] = [
 			if (Array.isArray(message?.text)) {
 				return message?.text.length > 0;
 			}
-			// Handle messages from LLMs if it only contains any escape sequences and markdown is disabled
+
+			// Handle messages from LLMs if it only contains any escape sequences and collation is disabled
 			if (
-				message.text?.match?.(/^(?:[\n\t\r\f\b\v\s])+$/)?.length &&
-				!config?.settings.behavior.renderMarkdown &&
-				!config?.settings.behavior.collateStreamedOutputs
-			)
+				isOnlyEscapeSequence(message.text) &&
+				!config?.settings?.behavior?.collateStreamedOutputs
+			) {
 				return false;
+			}
 
 			return message?.text !== null && message?.text !== undefined && message?.text !== "";
 		},

src/utils.ts

@@ -241,3 +241,14 @@ export const moveFocusToMessageFocusTarget = (dataMessageId: string) => {
 		}
 	}, 0);
 };
+
+const ESCAPE_SEQUENCE_REGEX = /^(?:[\n\t\r\f\b\v\s])+$/u;
+
+/**
+ * Checks if a string consists only of whitespace or escape sequences.
+ * @param text The string to check.
+ * @returns True if the string contains only whitespace or escape sequences; otherwise, false.
+ */
+export function isOnlyEscapeSequence(text: unknown): boolean {
+	return typeof text === "string" && ESCAPE_SEQUENCE_REGEX.test(text);
+}

test/demo.tsx

@@ -482,6 +482,19 @@ const screens: TScreen[] = [
 					text: 0,
 				},
 			},
+			{
+				message: {
+					text: " \n\n",
+					source: "bot",
+				},
+				config: {
+					settings: {
+						behavior: {
+							renderMarkdown: true,
+						},
+					},
+				},
+			},
 			{
 				// Data-only message should not render anything
 				message: {