Browserify incremental memory cache bug

index.js

'use strict'

const browserify = require('browserify')
const concat = require('concat-stream')
const delay = require('delay')
const fs = require('fs')
const incremental = require('browserify-incremental')

const forceMode = '--force' === process.argv[2]

let bundler, builds = 0

function bundle() {
  if (forceMode || !bundler) {
    bundler = browserify(Object.assign({
      entries: 'bundle.js'
    }, incremental.args))

    incremental(bundler)
  }

  return new Promise(resolve => {
    console.time('Bundle')

    bundler.bundle()
      .pipe(concat(
        d => {
          console.timeEnd('Bundle')

          if (d.toString().match(/alert\("yay"\)/g).length !== ++builds) {
            console.error('Not updated')
          }

          resolve()
        }
      ))
  })
}

function createMainEntry() {
  return new Promise(resolve => {
    fs.writeFile('bundle.js', 'alert("yay")\n', resolve)
  })
}

function updateMainEntry() {
  return new Promise(resolve => {
    fs.appendFile('bundle.js', 'alert("yay")\n', resolve)
  })
}

function deleteMainEntry() {
  return new Promise(resolve => {
    fs.unlink('bundle.js', resolve)
  })
}

Promise.resolve()
  .then(createMainEntry)
  .then(bundle)
  .then(updateMainEntry)
  .then(delay(2000))
  .then(bundle)
  .then(deleteMainEntry)

package.json

{
  "dependencies": {
    "browserify": "^13.0.1",
    "browserify-incremental": "^3.1.1",
    "delay": "^1.3.1",
    "stream-assert": "^2.0.3"
  }
}