diff --git a/src/libs/focusWithDelay.js b/src/libs/focusWithDelay.ts
similarity index 72%
rename from src/libs/focusWithDelay.js
rename to src/libs/focusWithDelay.ts
index 367cc2b92f9f..00d0e915879e 100644
--- a/src/libs/focusWithDelay.js
+++ b/src/libs/focusWithDelay.ts
@@ -1,15 +1,14 @@
-import {InteractionManager} from 'react-native';
+import {InteractionManager, TextInput} from 'react-native';
 import ComposerFocusManager from './ComposerFocusManager';
 
+type FocusWithDelay = (shouldDelay?: boolean) => void;
 /**
  * Create a function that focuses a text input.
- * @param {Object} textInput the text input to focus
- * @returns {Function} a function that focuses the text input with a configurable delay
  */
-function focusWithDelay(textInput) {
+function focusWithDelay(textInput: TextInput | null): FocusWithDelay {
     /**
      * Focus the text input
-     * @param {Boolean} [shouldDelay=false] Impose delay before focusing the text input
+     * @param [shouldDelay] Impose delay before focusing the text input
      */
     return (shouldDelay = false) => {
         // There could be other animations running while we trigger manual focus.
@@ -18,6 +17,7 @@ function focusWithDelay(textInput) {
             if (!textInput) {
                 return;
             }
+
             if (!shouldDelay) {
                 textInput.focus();
                 return;