I'm trying to build a web app in AWS lambda and upload it to an S3 bucket. For that, I utilize child process, which is working fine locally.

```
exec('cd /tmp/ && npm ci && ng build --prod="true"', (error, stderr, stdout) => {
      if (error) {
        console.log(error);
        return reject(error);
        }
      });

```

I also tried using npm install instead of npm ci, in all cases it fails with the error:

> 
> "npm ERR! errno -30",
> "npm ERR! rofs EROFS: read-only file system, mkdir '/home/sbx\_user1051'",
> "npm ERR! rofs Often virtualized file systems, or other file systems",
> "npm ERR! rofs that don't support symlinks, give this error.",
> "npm ERR! code EROFS",
> "npm ERR! syscall mkdir",
> 
> 
> Command failed: cd /tmp/ && npm ci && ng build --prod="true"\nnpm ERR! code EROFS\nnpm ERR! syscall mkdir\nnpm ERR! path /home/sbx\_user1051\nnpm ERR! errno -30\nnpm ERR! rofs EROFS: read-only file system, mkdir '/home/sbx\_user1051'\nnpm ERR! rofs Often virtualized file systems, or other file systems\nnpm ERR! rofs that don't support symlinks, give this error.\nnpm ERR!
> 
> 
> 

I understand that only the /tmp/ directory is writable in AWS Lambda. I just don't know how to tell npm to run in /tmp.

Any ideas?