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✏️ rimraf.js

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module.exports = rimraf
rimraf.sync = rimrafSync

var assert = require("assert")
var path = require("path")
var fs = require("fs")
var glob = undefined
try {
  glob = require("glob")
} catch (_err) {
  // treat glob as optional.
}
var _0666 = parseInt('666', 8)

var defaultGlobOpts = {
  nosort: true,
  silent: true
}

// for EMFILE handling
var timeout = 0

var isWindows = (process.platform === "win32")

function defaults (options) {
  var methods = [
    'unlink',
    'chmod',
    'stat',
    'lstat',
    'rmdir',
    'readdir'
  ]
  methods.forEach(function(m) {
    options[m] = options[m] || fs[m]
    m = m + 'Sync'
    options[m] = options[m] || fs[m]
  })

options.maxBusyTries = options.maxBusyTries || 3
  options.emfileWait = options.emfileWait || 1000
  if (options.glob === false) {
    options.disableGlob = true
  }
  if (options.disableGlob !== true && glob === undefined) {
    throw Error('glob dependency not found, set `options.disableGlob = true` if intentional')
  }
  options.disableGlob = options.disableGlob || false
  options.glob = options.glob || defaultGlobOpts
}

function rimraf (p, options, cb) {
  if (typeof options === 'function') {
    cb = options
    options = {}
  }

assert(p, 'rimraf: missing path')
  assert.equal(typeof p, 'string', 'rimraf: path should be a string')
  assert.equal(typeof cb, 'function', 'rimraf: callback function required')
  assert(options, 'rimraf: invalid options argument provided')
  assert.equal(typeof options, 'object', 'rimraf: options should be object')

defaults(options)

var busyTries = 0
  var errState = null
  var n = 0

if (options.disableGlob || !glob.hasMagic(p))
    return afterGlob(null, [p])

options.lstat(p, function (er, stat) {
    if (!er)
      return afterGlob(null, [p])

glob(p, options.glob, afterGlob)
  })

function next (er) {
    errState = errState || er
    if (--n === 0)
      cb(errState)
  }

function afterGlob (er, results) {
    if (er)
      return cb(er)

n = results.length
    if (n === 0)
      return cb()

results.forEach(function (p) {
      rimraf_(p, options, function CB (er) {
        if (er) {
          if ((er.code === "EBUSY" || er.code === "ENOTEMPTY" || er.code === "EPERM") &&
              busyTries < options.maxBusyTries) {
            busyTries ++
            var time = busyTries * 100
            // try again, with the same exact callback as this one.
            return setTimeout(function () {
              rimraf_(p, options, CB)
            }, time)
          }

// this one won't happen if graceful-fs is used.
          if (er.code === "EMFILE" && timeout < options.emfileWait) {
            return setTimeout(function () {
              rimraf_(p, options, CB)
            }, timeout ++)
          }

// already gone
          if (er.code === "ENOENT") er = null
        }

timeout = 0
        next(er)
      })
    })
  }
}

// Two possible strategies.
// 1. Assume it's a file.  unlink it, then do the dir stuff on EPERM or EISDIR
// 2. Assume it's a directory.  readdir, then do the file stuff on ENOTDIR
//
// Both result in an extra syscall when you guess wrong.  However, there
// are likely far more normal files in the world than directories.  This
// is based on the assumption that a the average number of files per
// directory is >= 1.
//
// If anyone ever complains about this, then I guess the strategy could
// be made configurable somehow.  But until then, YAGNI.
function rimraf_ (p, options, cb) {
  assert(p)
  assert(options)
  assert(typeof cb === 'function')

// sunos lets the root user unlink directories, which is... weird.
  // so we have to lstat here and make sure it's not a dir.
  options.lstat(p, function (er, st) {
    if (er && er.code === "ENOENT")
      return cb(null)

// Windows can EPERM on stat.  Life is suffering.
    if (er && er.code === "EPERM" && isWindows)
      fixWinEPERM(p, options, er, cb)

if (st && st.isDirectory())
      return rmdir(p, options, er, cb)

options.unlink(p, function (er) {
      if (er) {
        if (er.code === "ENOENT")
          return cb(null)
        if (er.code === "EPERM")
          return (isWindows)
            ? fixWinEPERM(p, options, er, cb)
            : rmdir(p, options, er, cb)
        if (er.code === "EISDIR")
          return rmdir(p, options, er, cb)
      }
      return cb(er)
    })
  })
}

function fixWinEPERM (p, options, er, cb) {
  assert(p)
  assert(options)
  assert(typeof cb === 'function')
  if (er)
    assert(er instanceof Error)

options.chmod(p, _0666, function (er2) {
    if (er2)
      cb(er2.code === "ENOENT" ? null : er)
    else
      options.stat(p, function(er3, stats) {
        if (er3)
          cb(er3.code === "ENOENT" ? null : er)
        else if (stats.isDirectory())
          rmdir(p, options, er, cb)
        else
          options.unlink(p, cb)
      })
  })
}

function fixWinEPERMSync (p, options, er) {
  assert(p)
  assert(options)
  if (er)
    assert(er instanceof Error)

try {
    options.chmodSync(p, _0666)
  } catch (er2) {
    if (er2.code === "ENOENT")
      return
    else
      throw er
  }

try {
    var stats = options.statSync(p)
  } catch (er3) {
    if (er3.code === "ENOENT")
      return
    else
      throw er
  }

if (stats.isDirectory())
    rmdirSync(p, options, er)
  else
    options.unlinkSync(p)
}

function rmdir (p, options, originalEr, cb) {
  assert(p)
  assert(options)
  if (originalEr)
    assert(originalEr instanceof Error)
  assert(typeof cb === 'function')

// try to rmdir first, and only readdir on ENOTEMPTY or EEXIST (SunOS)
  // if we guessed wrong, and it's not a directory, then
  // raise the original error.
  options.rmdir(p, function (er) {
    if (er && (er.code === "ENOTEMPTY" || er.code === "EEXIST" || er.code === "EPERM"))
      rmkids(p, options, cb)
    else if (er && er.code === "ENOTDIR")
      cb(originalEr)
    else
      cb(er)
  })
}

function rmkids(p, options, cb) {
  assert(p)
  assert(options)
  assert(typeof cb === 'function')

options.readdir(p, function (er, files) {
    if (er)
      return cb(er)
    var n = files.length
    if (n === 0)
      return options.rmdir(p, cb)
    var errState
    files.forEach(function (f) {
      rimraf(path.join(p, f), options, function (er) {
        if (errState)
          return
        if (er)
          return cb(errState = er)
        if (--n === 0)
          options.rmdir(p, cb)
      })
    })
  })
}

// this looks simpler, and is strictly *faster*, but will
// tie up the JavaScript thread and fail on excessively
// deep directory trees.
function rimrafSync (p, options) {
  options = options || {}
  defaults(options)

assert(p, 'rimraf: missing path')
  assert.equal(typeof p, 'string', 'rimraf: path should be a string')
  assert(options, 'rimraf: missing options')
  assert.equal(typeof options, 'object', 'rimraf: options should be object')

var results

if (options.disableGlob || !glob.hasMagic(p)) {
    results = [p]
  } else {
    try {
      options.lstatSync(p)
      results = [p]
    } catch (er) {
      results = glob.sync(p, options.glob)
    }
  }

if (!results.length)
    return

for (var i = 0; i < results.length; i++) {
    var p = results[i]

try {
      var st = options.lstatSync(p)
    } catch (er) {
      if (er.code === "ENOENT")
        return

// Windows can EPERM on stat.  Life is suffering.
      if (er.code === "EPERM" && isWindows)
        fixWinEPERMSync(p, options, er)
    }

try {
      // sunos lets the root user unlink directories, which is... weird.
      if (st && st.isDirectory())
        rmdirSync(p, options, null)
      else
        options.unlinkSync(p)
    } catch (er) {
      if (er.code === "ENOENT")
        return
      if (er.code === "EPERM")
        return isWindows ? fixWinEPERMSync(p, options, er) : rmdirSync(p, options, er)
      if (er.code !== "EISDIR")
        throw er

rmdirSync(p, options, er)
    }
  }
}

function rmdirSync (p, options, originalEr) {
  assert(p)
  assert(options)
  if (originalEr)
    assert(originalEr instanceof Error)

try {
    options.rmdirSync(p)
  } catch (er) {
    if (er.code === "ENOENT")
      return
    if (er.code === "ENOTDIR")
      throw originalEr
    if (er.code === "ENOTEMPTY" || er.code === "EEXIST" || er.code === "EPERM")
      rmkidsSync(p, options)
  }
}

function rmkidsSync (p, options) {
  assert(p)
  assert(options)
  options.readdirSync(p).forEach(function (f) {
    rimrafSync(path.join(p, f), options)
  })

// We only end up here once we got ENOTEMPTY at least once, and
  // at this point, we are guaranteed to have removed all the kids.
  // So, we know that it won't be ENOENT or ENOTDIR or anything else.
  // try really hard to delete stuff on windows, because it has a
  // PROFOUNDLY annoying habit of not closing handles promptly when
  // files are deleted, resulting in spurious ENOTEMPTY errors.
  var retries = isWindows ? 100 : 1
  var i = 0
  do {
    var threw = true
    try {
      var ret = options.rmdirSync(p, options)
      threw = false
      return ret
    } finally {
      if (++i < retries && threw)
        continue
    }
  } while (true)
}

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✏️ rimraf.js