diff --git a/src/libs/localFileDownload/index.android.js b/src/libs/localFileDownload/index.android.ts
similarity index 88%
rename from src/libs/localFileDownload/index.android.js
rename to src/libs/localFileDownload/index.android.ts
index b3e39e7a7a53..ad13b5c5cfa7 100644
--- a/src/libs/localFileDownload/index.android.js
+++ b/src/libs/localFileDownload/index.android.ts
@@ -1,15 +1,13 @@
 import RNFetchBlob from 'react-native-blob-util';
 import * as FileUtils from '../fileDownload/FileUtils';
+import LocalFileDownload from './types';
 
 /**
  * Writes a local file to the app's internal directory with the given fileName
  * and textContent, so we're able to copy it to the Android public download dir.
  * After the file is copied, it is removed from the internal dir.
- *
- * @param {String} fileName
- * @param {String} textContent
  */
-export default function localFileDownload(fileName, textContent) {
+const localFileDownload: LocalFileDownload = (fileName, textContent) => {
     const newFileName = FileUtils.appendTimeToFileName(fileName);
     const dir = RNFetchBlob.fs.dirs.DocumentDir;
     const path = `${dir}/${newFileName}.txt`;
@@ -34,4 +32,6 @@ export default function localFileDownload(fileName, textContent) {
                 RNFetchBlob.fs.unlink(path);
             });
     });
-}
+};
+
+export default localFileDownload;
diff --git a/src/libs/localFileDownload/index.ios.js b/src/libs/localFileDownload/index.ios.ts
similarity index 82%
rename from src/libs/localFileDownload/index.ios.js
rename to src/libs/localFileDownload/index.ios.ts
index 1241f5a535db..3597ea5f6d3c 100644
--- a/src/libs/localFileDownload/index.ios.js
+++ b/src/libs/localFileDownload/index.ios.ts
@@ -1,16 +1,14 @@
 import {Share} from 'react-native';
 import RNFetchBlob from 'react-native-blob-util';
 import * as FileUtils from '../fileDownload/FileUtils';
+import LocalFileDownload from './types';
 
 /**
  * Writes a local file to the app's internal directory with the given fileName
  * and textContent, so we're able to share it using iOS' share API.
  * After the file is shared, it is removed from the internal dir.
- *
- * @param {String} fileName
- * @param {String} textContent
  */
-export default function localFileDownload(fileName, textContent) {
+const localFileDownload: LocalFileDownload = (fileName, textContent) => {
     const newFileName = FileUtils.appendTimeToFileName(fileName);
     const dir = RNFetchBlob.fs.dirs.DocumentDir;
     const path = `${dir}/${newFileName}.txt`;
@@ -20,4 +18,6 @@ export default function localFileDownload(fileName, textContent) {
             RNFetchBlob.fs.unlink(path);
         });
     });
-}
+};
+
+export default localFileDownload;
diff --git a/src/libs/localFileDownload/index.js b/src/libs/localFileDownload/index.ts
similarity index 77%
rename from src/libs/localFileDownload/index.js
rename to src/libs/localFileDownload/index.ts
index 427928834c9c..7b9b4973d5c1 100644
--- a/src/libs/localFileDownload/index.js
+++ b/src/libs/localFileDownload/index.ts
@@ -1,18 +1,18 @@
 import * as FileUtils from '../fileDownload/FileUtils';
+import LocalFileDownload from './types';
 
 /**
  * Creates a Blob with the given fileName and textContent, then dynamically
  * creates a temporary anchor, just to programmatically click it, so the file
  * is downloaded by the browser.
- *
- * @param {String} fileName
- * @param {String} textContent
  */
-export default function localFileDownload(fileName, textContent) {
+const localFileDownload: LocalFileDownload = (fileName, textContent) => {
     const blob = new Blob([textContent], {type: 'text/plain'});
     const url = URL.createObjectURL(blob);
     const link = document.createElement('a');
     link.download = FileUtils.appendTimeToFileName(`${fileName}.txt`);
     link.href = url;
     link.click();
-}
+};
+
+export default localFileDownload;
diff --git a/src/libs/localFileDownload/types.ts b/src/libs/localFileDownload/types.ts
new file mode 100644
index 000000000000..2086e2334d39
--- /dev/null
+++ b/src/libs/localFileDownload/types.ts
@@ -0,0 +1,3 @@
+type LocalFileDownload = (fileName: string, textContent: string) => void;
+
+export default LocalFileDownload;