index.js
function compileToken (token, arg) {
  let fn = tokens[token] || noOp

  return function () {
    return arg ? fn.call(this, arg) : fn.call(this)
  }
}
function compileToken (token, arg) {
  let fn = tokens[token] || noOp

  return function () {
    return arg ? fn.call(this, arg) : fn.call(this)
  }
}
function compileToken ( token , arg ) { let fn = tokens [ token ] || noOp return function ( ) { return arg ? fn . call ( this , arg ) : fn . call ( this ) } }
Compile a token string into a function.

@param {string} token
@param {string} arg
@return {function}
@private
Compile a token string into a function .