code: function formatStack(stack, options) {
    var newStack = []
      , lineFormatter = options.lineFormatter || defaultFormatter
      , line
      , i, l, j, m
  
    stack = stack.split('\n')
  
    for (i=0, l=stack.length; i<l; i++) {
      line = lineFormatter(stack[i], {colors: options.colors})
      for (j=0, m=options.filter.length; j<m; j++) {
        if (line && line.indexOf(options.filter[j]) !== -1) {
          line = null
          break
        }
      }
      if (line) {
        newStack.push(line)
      }
    }
    return newStack.join('\n')
  }
docs: /* Post-generation formatting