Prettier 1.16.4
Playground link

Input:

Causes a syntax error:

* Text

 	[http://www.foo.com](link)

Just for clarity:

• There are no trailing spaces after the word "Text" on the first line.
• The second line is empty. (no spaces)
• The third line starts with a space then a tab.

Output:

Invalid regular expression: /^\s{0,3}[/: Unterminated character class