method Deno.stderr.writeSync
stderr.writeSync(p: Uint8Array): number
Synchronously write the contents of the array buffer (`p`) to `stderr`.
Returns the number of bytes written.
**It is not guaranteed that the full buffer will be written in a single
call.**
```ts
const encoder = new TextEncoder();
const data = encoder.encode("Hello world");
const bytesWritten = Deno.stderr.writeSync(data); // 11
```
number