src/where.js
function handleFunction (node, options) {
  const args = handleExprList(node.args, options)
  return `${node.name}${args}`
}
function handleFunction (node, options) {
  const args = handleExprList(node.args, options)
  return `${node.name}${args}`
}
function handleFunction ( node , options ) { const args = handleExprList ( node . args , options ) return ` ${ node . name } ${ args } ` }
Convert a function node to its string representation.
@param  {object} node    AST function node
@param  {object} options winnow options
@return {string}         function string
Convert a function node to its string representation .