diff --git a/desktop/flipper-server-core/src/FlipperServerImpl.tsx b/desktop/flipper-server-core/src/FlipperServerImpl.tsx
index 972f4604a..8b5cb6ba3 100644
--- a/desktop/flipper-server-core/src/FlipperServerImpl.tsx
+++ b/desktop/flipper-server-core/src/FlipperServerImpl.tsx
@@ -44,8 +44,10 @@ import {
   internGraphPOSTAPIRequest,
 } from './fb-stubs/internRequests';
 import {commandNodeApiExec} from './commands/NodeApiExec';
-import {access, copyFile, mkdir, unlink} from 'fs/promises';
 import {commandDownloadFileStartFactory} from './commands/DownloadFile';
+import {promises} from 'fs';
+
+const {access, copyFile, mkdir, unlink} = promises;
 
 export const SERVICE_FLIPPER = 'flipper.oAuthToken';
 
diff --git a/desktop/flipper-server-core/src/commands/DownloadFile.tsx b/desktop/flipper-server-core/src/commands/DownloadFile.tsx
index fde80811d..562c2a4a4 100644
--- a/desktop/flipper-server-core/src/commands/DownloadFile.tsx
+++ b/desktop/flipper-server-core/src/commands/DownloadFile.tsx
@@ -55,7 +55,10 @@ export const commandDownloadFileStartFactory =
       maxRedirects,
       headers,
     });
-    const totalSize = response.headers['content-length'] ?? 0;
+    let totalSize = parseInt(response.headers['content-length'], 10);
+    if (Number.isNaN(totalSize)) {
+      totalSize = 0;
+    }
 
     const writeStream = response.data.pipe(
       createWriteStream(dest, {autoClose: true}),
diff --git a/desktop/plugins/public/reactdevtools/index.tsx b/desktop/plugins/public/reactdevtools/index.tsx
index b0d4ec6cb..adf1e6193 100644
--- a/desktop/plugins/public/reactdevtools/index.tsx
+++ b/desktop/plugins/public/reactdevtools/index.tsx
@@ -22,7 +22,7 @@ import {
 import React from 'react';
 import getPort from 'get-port';
 import {Button, message, Switch, Typography, Select} from 'antd';
-import fs from 'fs/promises';
+import fs from 'fs';
 import {DevToolsEmbedder} from './DevToolsEmbedder';
 import {getInternalDevToolsModule} from './fb-stubs/getInternalDevToolsModule';
 
@@ -42,7 +42,7 @@ async function findGlobalDevTools(): Promise<string | undefined> {
       'node_modules',
       'react-devtools-core',
     );
-    await fs.stat(devToolsPath);
+    await fs.promises.stat(devToolsPath);
     return devToolsPath;
   } catch (error) {
     console.warn('Failed to find globally installed React DevTools: ' + error);