diff --git a/src/main.js b/src/main.js
index ebdb7ee..01a0b11 100644
--- a/src/main.js
+++ b/src/main.js
@@ -1,6 +1,6 @@
 import {generatePrivateKey, getPublicKey, nip19, signEvent} from 'nostr-tools';
 import {zeroLeadingBitsCount} from './utils/crypto';
-import {elem, elemCanvas, elemShrink, parseTextContent} from './utils/dom';
+import {elem, elemCanvas, elemShrink, parseTextContent, updateElemHeight} from './utils/dom';
 import {bounce, dateTime, formatTime} from './utils/time';
 import {getHost, getNoxyUrl, isWssUrl} from './utils/url';
 import {powEvent} from './system';
@@ -561,17 +561,6 @@ writeInput.addEventListener('input', () => {
 });
 writeInput.addEventListener('blur', () => sendStatus.textContent = '');
 
-function updateElemHeight(el) {
-  el.style.removeProperty('height');
-  if (el.value) {
-    el.style.paddingBottom = 0;
-    el.style.paddingTop = 0;
-    el.style.height = el.scrollHeight + 'px';
-    el.style.removeProperty('padding-bottom');
-    el.style.removeProperty('padding-top');
-  }
-}
-
 
 
 
diff --git a/src/utils/dom.ts b/src/utils/dom.ts
index 81e9d7f..5088a5b 100644
--- a/src/utils/dom.ts
+++ b/src/utils/dom.ts
@@ -162,3 +162,17 @@ export const elemShrink = (el: HTMLElement) => {
   shrink.addEventListener('animationend', () => shrink.remove(), {once: true});
   return shrink;
 };
+
+
+export const updateElemHeight = (
+  el: HTMLInputElement | HTMLTextAreaElement
+) => {
+  el.style.removeProperty('height');
+  if (el.value) {
+    el.style.paddingBottom = '0';
+    el.style.paddingTop = '0';
+    el.style.height = el.scrollHeight + 'px';
+    el.style.removeProperty('padding-bottom');
+    el.style.removeProperty('padding-top');
+  }
+};