feat: Convert all app files to JS

packages/backend/src/apps/dropbox/auth/refresh-token.js

@@ -0,0 +1,36 @@
+import { Buffer } from 'node:buffer';
+
+const refreshToken = async ($) => {
+  const params = {
+    grant_type: 'refresh_token',
+    refresh_token: $.auth.data.refreshToken,
+  };
+
+  const basicAuthToken = Buffer.from(
+    `${$.auth.data.clientId}:${$.auth.data.clientSecret}`
+  ).toString('base64');
+
+  const { data } = await $.http.post('oauth2/token', null, {
+    params,
+    headers: {
+      Authorization: `Basic ${basicAuthToken}`,
+    },
+    additionalProperties: {
+      skipAddingAuthHeader: true,
+    },
+  });
+
+  const {
+    access_token: accessToken,
+    expires_in: expiresIn,
+    token_type: tokenType,
+  } = data;
+
+  await $.auth.set({
+    accessToken,
+    expiresIn,
+    tokenType,
+  });
+};
+
+export default refreshToken;