title: Expo Web Build in Vercel - Command "npx expo-cli build:web" exited with 1
body: <p>I want to build and deploy my expo app in vercel. I know that I can build it locally (<code>expo build:web</code>), <code>cd</code> into the build folder and run <code>vercel</code>, but I would like it to be done automatically with source control integration.</p>
  <p>So I have connected my github repository, <code>npm install</code> seems to be working ok. The problem is with the build command. I tried <code>expo build:web</code> but this failed because the expo cli is not installed in vercel, so I tried <code>npx expo-cli build:web</code> and got the folloowing output: <code>Command &quot;npx expo-cli build:web&quot; exited with 1</code>.</p>
  <pre><code>Error: Could not find MIME for Buffer &lt;null&gt;
   at /vercel/.npm/_npx/727/lib/node_modules/expo-cli/node_modules/xdl/src/Webpack.ts:294:23
   at finalCallback (/vercel/.npm/_npx/727/lib/node_modules/expo-cli/node_modules/webpack/lib/Compiler.js:257:39)
  </code></pre>
  <p>Does anyone know how I can run <code>expo build:web</code> in vercel? Many thanks</p>