Reverse a sentence with emoji

Write a function reverseSentence(sentence) that returns the string sentence with all its characters in reverse order.

• Every character counts: letters (also letters such as é), spaces, punctuation. Spaces at the start and the end are kept, they just move to the other end: ' a ' gives ' a ', 'ab ' gives ' ba'.
• An emoji such as 😀 or 🚀 stays whole: 'Hi 😀' gives '😀 iH'.
• The input has only single emoji, no flags and no emoji made of several parts.
• An empty string gives ''.

Watch out: split('') cuts an emoji in half, and the result shows broken symbols. for...of and the spread syntax [...sentence] go by whole characters.