How can I output to STDERR with Swift?

For Swift 4.x:

import Darwin
fputs("hello from libc\n", stderr)

Here is a Swift 3 snippet modified from https://gist.github.com/algal/0a9aa5a4115d86d5cc1de7ea6d06bd91.

import Foundation

var standardError = FileHandle.standardError

extension FileHandle: TextOutputStream {
  public func write(_ string: String) {
    let data = Data(string.utf8)
    self.write(data)
  }
}

print("I am printed to stderr", to: &standardError)

Tags:

Macos

Swift

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