feat: Add typing indicator utility (#25)

* feat: Add typing indicator utility

* chore: Update version

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@chatwoot/utils",
-  "version": "0.0.18",
+  "version": "0.0.19",
   "description": "Chatwoot utils",
   "private": false,
   "license": "MIT",

src/typingStatus.ts

@@ -0,0 +1,44 @@
+/**
+ * Creates a typing indicator utility.
+ * @param onStartTyping Callback function to be called when typing starts
+ * @param onStopTyping Callback function to be called when typing stops after delay
+ * @param idleTime Delay for idle time in ms before considering typing stopped
+ * @returns An object with start and stop methods for typing indicator
+ */
+
+type CallbackFunction = () => void;
+type Timeout = ReturnType<typeof setTimeout>;
+
+export const createTypingIndicator = (
+  onStartTyping: CallbackFunction,
+  onStopTyping: CallbackFunction,
+  idleTime: number
+) => {
+  let timer: Timeout | null = null;
+
+  const start = (): void => {
+    if (!timer) {
+      onStartTyping();
+    }
+    reset();
+  };
+
+  const stop = (): void => {
+    if (timer) {
+      clearTimeout(timer as Timeout);
+      timer = null;
+      onStopTyping();
+    }
+  };
+
+  const reset = (): void => {
+    if (timer) {
+      clearTimeout(timer as Timeout);
+    }
+    timer = setTimeout(() => {
+      stop();
+    }, idleTime) as Timeout;
+  };
+
+  return { start, stop };
+};