I am using node and I need to copy a file that may be pretty big. Is it fine to use copyFileSync?

I can't find any source about it describing its implementation. I need to know if it works with streams or just loads everything into memory and writes the file.

Small examples

import { copyFileSync } from 'fs';
copyFileSync(srcPath, destPath);

import { copyFile } from 'fs/promises';
await copyFile(srcPath, destPath);