throwif operator

[Нурбек]

An example from node.js documentation:

fs.writeFile('message.txt', 'Hello Node.js', (err) => {
  if (err) throw err;
  console.log('The file has been saved!');
});

This looks like a common way to handle errors when the first parameter is
an instance of Error.

Yes, this line of code is short and easy to copy-paste.
But introducing something like this:

fs.writeFile('message.txt', 'Hello Node.js', (err) => {
  throwif err;
  console.log('The file has been saved!');
});

would make the code much cleaner and bring some sort of standart way to
handle such errors.
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