lib/functions/prefix-classes.js
function prefixClasses(prefix, block){
  utils.assertString(prefix, 'prefix');
  utils.assertType(block, 'block', 'block');

  var _prefix = this.prefix;

  this.options.prefix = this.prefix = prefix.string;
  block = this.visit(block);
  this.options.prefix = this.prefix = _prefix;
  return block;
}
function prefixClasses(prefix, block){
  utils.assertString(prefix, 'prefix');
  utils.assertType(block, 'block', 'block');

  var _prefix = this.prefix;

  this.options.prefix = this.prefix = prefix.string;
  block = this.visit(block);
  this.options.prefix = this.prefix = _prefix;
  return block;
}
function prefixClasses ( prefix , block ) { utils . assertString ( prefix , 'prefix' ) ; utils . assertType ( block , 'block' , 'block' ) ; var _prefix = this . prefix ; this . options . prefix = this . prefix = prefix . string ; block = this . visit ( block ) ; this . options . prefix = this . prefix = _prefix ; return block ; }
Prefix css classes in a block

@param {String} prefix
@param {Block} block
@return {Block}
@api private
Prefix css classes in a block