Valid configuration options are:
- 'break' remove blank lines after a line with a 'break' statement
- 'continue' remove blank lines after a line with a 'continue' statement
- 'extra' [default] consecutive blank lines are squashed into one
- 'return' remove blank lines after a line with a 'return' statement
- 'throw' remove blank lines after a line with a 'throw' statement
- 'use' remove blank lines between 'use' import statements
- 'useTrait' remove blank lines between 'use' trait statements
- 'curly_brace_block' remove blank lines after a curly opening block brace ('{') and/or end block brace ('}')
- 'parenthesis_brace_block' remove blank lines after a parenthesis opening block brace ('(') and/or end block brace (')')
- 'square_brace_block' remove blank lines after a square opening block brace ('[') and/or end block brace (']')