Pino RingBuffer

index.js

var pino = require('./')
var RingBuffer = require('./ringbuffer')

var rb = new RingBuffer({ limit: 10 })
var log = pino(rb)

setInterval(() => {
  log.info(new Date())
}, 5)

setTimeout(() => {
  console.log(rb.getRecords())
  process.exit(0)
}, 100)

ringbuffer.js

'use strict'

var stream = require('stream')
var util = require('util')

function RingBuffer (options) {
  var self = this

  self.limit = options && options.limit ? options.limit : 100
  self.records = []

  stream.Writable.call(this)
}
util.inherits(RingBuffer, stream.Writable)

RingBuffer.prototype.write = function (record) {
  if (this.records.length >= this.limit) this.records.pop()
  this.records.push(record)
}

RingBuffer.prototype.getRecords = function () {
  return this.records.map((record) => record.replace(/\n$/, ''))
}

module.exports = RingBuffer

Yah cool then we'll add to readme, one other thing - would encourage exporting a function that returns a new instance of RingBuffer rather than exporting the constructor directly. This avoids issues that arise from forgetting new, naming convention stuff, fp paradigm friendly, generally makes for quicker api grocking imo