beautify HTML argument "preserve-newlines"

[LaKing]

var beautify_html = require('js-beautify').html;

  beat = beautify_html(text, {
       indent_size: 4,
       preserve-newlines: true
 });

Gives an error at the middle of preserve-newlines.
Is this a documentation mistake? It doesent seem to work with underscores.

-p, --preserve-newlines Preserve existing line-breaks (--no-preserve-newlines disables)

[bitwiseman]

It looks like you have preserve-newlines instead of preserve_newlines. On the command line it is preserve-newlines, in the options it is preserve_newlines.