```typescript
import { type Process } from "node:node__process.d.ts";
```
Process.umask(): number
Deprecated
Calling `process.umask()` with no argument causes the process-wide umask to be written twice. This introduces a race condition between threads, and is a potential
security vulnerability. There is no safe, cross-platform alternative API.
`process.umask()` returns the Node.js process's file mode creation mask. Child
processes inherit the mask from the parent process.