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Name	Size	Permission
arborist	[ DIR ]	drwxr-xr-x
add-rm-pkg-deps.js	4.89 KB	-rw-r--r--
audit-report.js	11.99 KB	-rw-r--r--
calc-dep-flags.js	3.07 KB	-rw-r--r--
can-place-dep.js	13.94 KB	-rw-r--r--
case-insensitive-map.js	1.32 KB	-rw-r--r--
consistent-resolve.js	1.4 KB	-rw-r--r--
debug.js	1.2 KB	-rw-r--r--
deepest-nesting-target.js	691 B	-rw-r--r--
dep-valid.js	4.87 KB	-rw-r--r--
diff.js	9.57 KB	-rw-r--r--
edge.js	6.82 KB	-rw-r--r--
from-path.js	1.04 KB	-rw-r--r--
gather-dep-set.js	1.26 KB	-rw-r--r--
get-workspace-nodes.js	863 B	-rw-r--r--
index.js	353 B	-rw-r--r--
inventory.js	3.2 KB	-rw-r--r--
link.js	3.6 KB	-rw-r--r--
node.js	43.06 KB	-rw-r--r--
optional-set.js	1.32 KB	-rw-r--r--
override-resolves.js	230 B	-rw-r--r--
override-set.js	2.54 KB	-rw-r--r--
peer-entry-sets.js	2.57 KB	-rw-r--r--
place-dep.js	19.73 KB	-rw-r--r--
printable.js	5.09 KB	-rw-r--r--
query-selector-all.js	16.43 KB	-rw-r--r--
realpath.js	2.67 KB	-rw-r--r--
relpath.js	131 B	-rw-r--r--
reset-dep-flags.js	638 B	-rw-r--r--
retire-path.js	491 B	-rw-r--r--
shrinkwrap.js	37.02 KB	-rw-r--r--
signal-handling.js	2.19 KB	-rw-r--r--
signals.js	1.35 KB	-rw-r--r--
spec-from-lock.js	874 B	-rw-r--r--
tracker.js	3.29 KB	-rw-r--r--
tree-check.js	4.02 KB	-rw-r--r--
version-from-tgz.js	1.45 KB	-rw-r--r--
vuln.js	5.72 KB	-rw-r--r--
yarn-lock.js	10.05 KB	-rw-r--r--

Code Editor : realpath.js

// look up the realpath, but cache stats to minimize overhead
// If the parent folder is in  the realpath cache, then we just
// lstat the child, since there's no need to do a full realpath
// This is not a separate module, and is much simpler than Node's
// built-in fs.realpath, because we only care about symbolic links,
// so we can handle many fewer edge cases.

const fs = require('fs')
const promisify = require('util').promisify
const readlink = promisify(fs.readlink)
const lstat = promisify(fs.lstat)
const { resolve, basename, dirname } = require('path')

const realpathCached = (path, rpcache, stcache, depth) => {
  // just a safety against extremely deep eloops
  /* istanbul ignore next */
  if (depth > 2000) {
    throw eloop(path)
  }

path = resolve(path)
  if (rpcache.has(path)) {
    return Promise.resolve(rpcache.get(path))
  }

const dir = dirname(path)
  const base = basename(path)

if (base && rpcache.has(dir)) {
    return realpathChild(dir, base, rpcache, stcache, depth)
  }

// if it's the root, then we know it's real
  if (!base) {
    rpcache.set(dir, dir)
    return Promise.resolve(dir)
  }

// the parent, what is that?
  // find out, and then come back.
  return realpathCached(dir, rpcache, stcache, depth + 1).then(() =>
    realpathCached(path, rpcache, stcache, depth + 1))
}

const lstatCached = (path, stcache) => {
  if (stcache.has(path)) {
    return Promise.resolve(stcache.get(path))
  }

const p = lstat(path).then(st => {
    stcache.set(path, st)
    return st
  })
  stcache.set(path, p)
  return p
}

// This is a slight fib, as it doesn't actually occur during a stat syscall.
// But file systems are giant piles of lies, so whatever.
const eloop = path =>
  Object.assign(new Error(
    `ELOOP: too many symbolic links encountered, stat '${path}'`), {
    errno: -62,
    syscall: 'stat',
    code: 'ELOOP',
    path: path,
  })

const realpathChild = (dir, base, rpcache, stcache, depth) => {
  const realdir = rpcache.get(dir)
  // that unpossible
  /* istanbul ignore next */
  if (typeof realdir === 'undefined') {
    throw new Error('in realpathChild without parent being in realpath cache')
  }

const realish = resolve(realdir, base)
  return lstatCached(realish, stcache).then(st => {
    if (!st.isSymbolicLink()) {
      rpcache.set(resolve(dir, base), realish)
      return realish
    }

return readlink(realish).then(target => {
      const resolved = resolve(realdir, target)
      if (realish === resolved) {
        throw eloop(realish)
      }

return realpathCached(resolved, rpcache, stcache, depth + 1)
    }).then(real => {
      rpcache.set(resolve(dir, base), real)
      return real
    })
  })
}

module.exports = realpathCached

${this.title}

Code Editor : realpath.js