AlkantarClanX12
Your IP : 18.118.119.129
'use strict'
const BB = require('bluebird')
var fs = require('fs')
var assert = require('assert')
var path = require('path')
var semver = require('semver')
var asyncMap = require('slide').asyncMap
var chain = require('slide').chain
var iferr = require('iferr')
var npa = require('npm-package-arg')
var validate = require('aproba')
var dezalgo = require('dezalgo')
var fetchPackageMetadata = require('../fetch-package-metadata.js')
var andAddParentToErrors = require('./and-add-parent-to-errors.js')
var addBundled = require('../fetch-package-metadata.js').addBundled
var readShrinkwrap = require('./read-shrinkwrap.js')
var inflateShrinkwrap = require('./inflate-shrinkwrap.js')
var inflateBundled = require('./inflate-bundled.js')
var andFinishTracker = require('./and-finish-tracker.js')
var npm = require('../npm.js')
var flatNameFromTree = require('./flatten-tree.js').flatNameFromTree
var createChild = require('./node.js').create
var resetMetadata = require('./node.js').reset
var isInstallable = require('./validate-args.js').isInstallable
var packageId = require('../utils/package-id.js')
var moduleName = require('../utils/module-name.js')
var isDevDep = require('./is-dev-dep.js')
var isProdDep = require('./is-prod-dep.js')
var reportOptionalFailure = require('./report-optional-failure.js')
var getSaveType = require('./save.js').getSaveType
var unixFormatPath = require('../utils/unix-format-path.js')
var isExtraneous = require('./is-extraneous.js')
var isRegistry = require('../utils/is-registry.js')
// The export functions in this module mutate a dependency tree, adding
// items to them.
var registryTypes = { range: true, version: true }
function doesChildVersionMatch (child, requested, requestor) {
if (child.fromShrinkwrap && !child.hasRequiresFromLock) return true
// ranges of * ALWAYS count as a match, because when downloading we allow
// prereleases to match * if there are ONLY prereleases
if (requested.type === 'range' && requested.fetchSpec === '*') return true
if (requested.type === 'directory') {
if (!child.isLink) return false
return path.relative(child.realpath, requested.fetchSpec) === ''
}
if (!registryTypes[requested.type]) {
var childReq = child.package._requested
if (childReq) {
if (childReq.rawSpec === requested.rawSpec) return true
if (childReq.type === requested.type && childReq.saveSpec === requested.saveSpec) return true
}
// If _requested didn't exist OR if it didn't match then we'll try using
// _from. We pass it through npa to normalize the specifier.
// This can happen when installing from an `npm-shrinkwrap.json` where `_requested` will
// be the tarball URL from `resolved` and thus can't match what's in the `package.json`.
// In those cases _from, will be preserved and we can compare that to ensure that they
// really came from the same sources.
// You'll see this scenario happen with at least tags and git dependencies.
// Some buggy clients will write spaces into the module name part of a _from.
if (child.package._from) {
var fromReq = npa.resolve(moduleName(child), child.package._from.replace(new RegExp('^\s*' + moduleName(child) + '\s*@'), ''))
if (fromReq.rawSpec === requested.rawSpec) return true
if (fromReq.type === requested.type && fromReq.saveSpec && fromReq.saveSpec === requested.saveSpec) return true
}
return false
}
try {
return semver.satisfies(child.package.version, requested.fetchSpec, true)
} catch (e) {
return false
}
}
function childDependencySpecifier (tree, name, spec) {
return npa.resolve(name, spec, packageRelativePath(tree))
}
exports.computeMetadata = computeMetadata
function computeMetadata (tree, seen) {
if (!seen) seen = new Set()
if (!tree || seen.has(tree)) return
seen.add(tree)
if (tree.parent == null) {
resetMetadata(tree)
tree.isTop = true
}
tree.location = flatNameFromTree(tree)
function findChild (name, spec, kind) {
try {
var req = childDependencySpecifier(tree, name, spec)
} catch (err) {
return
}
var child = findRequirement(tree, req.name, req)
if (child) {
resolveWithExistingModule(child, tree)
return true
}
return
}
const deps = tree.package.dependencies || {}
const reqs = tree.swRequires || {}
for (let name of Object.keys(deps)) {
if (findChild(name, deps[name])) continue
if (findChild(name, reqs[name])) continue
tree.missingDeps[name] = deps[name]
}
if (tree.isTop) {
const devDeps = tree.package.devDependencies || {}
for (let name of Object.keys(devDeps)) {
if (findChild(name, devDeps[name])) continue
tree.missingDevDeps[name] = devDeps[name]
}
}
tree.children.filter((child) => !child.removed).forEach((child) => computeMetadata(child, seen))
return tree
}
function isDep (tree, child) {
var name = moduleName(child)
var prodVer = isProdDep(tree, name)
var devVer = isDevDep(tree, name)
try {
var prodSpec = childDependencySpecifier(tree, name, prodVer)
} catch (err) {
return {isDep: true, isProdDep: false, isDevDep: false}
}
var matches
if (prodSpec) matches = doesChildVersionMatch(child, prodSpec, tree)
if (matches) return {isDep: true, isProdDep: prodSpec, isDevDep: false}
if (devVer === prodVer) return {isDep: child.fromShrinkwrap, isProdDep: false, isDevDep: false}
try {
var devSpec = childDependencySpecifier(tree, name, devVer)
return {isDep: doesChildVersionMatch(child, devSpec, tree) || child.fromShrinkwrap, isProdDep: false, isDevDep: devSpec}
} catch (err) {
return {isDep: child.fromShrinkwrap, isProdDep: false, isDevDep: false}
}
}
function addRequiredDep (tree, child) {
var dep = isDep(tree, child)
if (!dep.isDep) return false
replaceModuleByPath(child, 'requiredBy', tree)
replaceModuleByName(tree, 'requires', child)
if (dep.isProdDep && tree.missingDeps) delete tree.missingDeps[moduleName(child)]
if (dep.isDevDep && tree.missingDevDeps) delete tree.missingDevDeps[moduleName(child)]
return true
}
exports.removeObsoleteDep = removeObsoleteDep
function removeObsoleteDep (child, log) {
if (child.removed) return
child.removed = true
if (log) {
log.silly('removeObsoleteDep', 'removing ' + packageId(child) +
' from the tree as its been replaced by a newer version or is no longer required')
}
// remove from physical tree
if (child.parent) {
child.parent.children = child.parent.children.filter(function (pchild) { return pchild !== child })
}
// remove from logical tree
var requires = child.requires || []
requires.forEach(function (requirement) {
requirement.requiredBy = requirement.requiredBy.filter(function (reqBy) { return reqBy !== child })
// we don't just check requirement.requires because that doesn't account
// for circular deps. isExtraneous does.
if (isExtraneous(requirement)) removeObsoleteDep(requirement, log)
})
}
function packageRelativePath (tree) {
if (!tree) return ''
var requested = tree.package._requested || {}
var isLocal = requested.type === 'directory' || requested.type === 'file'
return isLocal ? requested.fetchSpec
: (tree.isLink || tree.isInLink) && !preserveSymlinks() ? tree.realpath
: tree.path
}
function matchingDep (tree, name) {
if (!tree || !tree.package) return
if (tree.package.dependencies && tree.package.dependencies[name]) return tree.package.dependencies[name]
if (tree.package.devDependencies && tree.package.devDependencies[name]) return tree.package.devDependencies[name]
return
}
exports.getAllMetadata = function (args, tree, where, next) {
asyncMap(args, function (arg, done) {
let spec
try {
spec = npa(arg)
} catch (e) {
return done(e)
}
if (spec.type !== 'file' && spec.type !== 'directory' && (spec.name == null || spec.rawSpec === '')) {
return fs.stat(path.join(arg, 'package.json'), (err) => {
if (err) {
var version = matchingDep(tree, spec.name)
if (version) {
try {
return fetchPackageMetadata(npa.resolve(spec.name, version), where, done)
} catch (e) {
return done(e)
}
} else {
return fetchPackageMetadata(spec, where, done)
}
} else {
try {
return fetchPackageMetadata(npa('file:' + arg), where, done)
} catch (e) {
return done(e)
}
}
})
} else {
return fetchPackageMetadata(spec, where, done)
}
}, next)
}
// Add a list of args to tree's top level dependencies
exports.loadRequestedDeps = function (args, tree, saveToDependencies, log, next) {
validate('AOOF', [args, tree, log, next])
asyncMap(args, function (pkg, done) {
var depLoaded = andAddParentToErrors(tree, done)
resolveWithNewModule(pkg, tree, log.newGroup('loadRequestedDeps'), iferr(depLoaded, function (child, tracker) {
validate('OO', arguments)
if (npm.config.get('global')) {
child.isGlobal = true
}
var childName = moduleName(child)
child.saveSpec = computeVersionSpec(tree, child)
child.userRequired = true
child.save = getSaveType(tree, child)
const types = ['dependencies', 'devDependencies', 'optionalDependencies']
if (child.save) {
tree.package[child.save][childName] = child.saveSpec
// Astute readers might notice that this exact same code exists in
// save.js under a different guise. That code is responsible for deps
// being removed from the final written `package.json`. The removal in
// this function is specifically to prevent "installed as both X and Y"
// warnings when moving an existing dep between different dep fields.
//
// Or, try it by removing this loop, and do `npm i -P x && npm i -D x`
for (let saveType of types) {
if (child.save !== saveType) {
delete tree.package[saveType][childName]
}
}
}
// For things the user asked to install, that aren't a dependency (or
// won't be when we're done), flag it as "depending" on the user
// themselves, so we don't remove it as a dep that no longer exists
var childIsDep = addRequiredDep(tree, child)
if (!childIsDep) child.userRequired = true
depLoaded(null, child, tracker)
}))
}, andForEachChild(loadDeps, andFinishTracker(log, next)))
}
function isNotEmpty (value) {
return value != null && value !== ''
}
exports.computeVersionSpec = computeVersionSpec
function computeVersionSpec (tree, child) {
validate('OO', arguments)
var requested
var childReq = child.package._requested
if (childReq && (isNotEmpty(childReq.saveSpec) || (isNotEmpty(childReq.rawSpec) && isNotEmpty(childReq.fetchSpec)))) {
requested = child.package._requested
} else if (child.package._from) {
requested = npa(child.package._from)
} else {
requested = npa.resolve(child.package.name, child.package.version)
}
if (isRegistry(requested)) {
var version = child.package.version
var rangeDescriptor = ''
if (semver.valid(version, true) &&
semver.gte(version, '0.1.0', true) &&
!npm.config.get('save-exact')) {
rangeDescriptor = npm.config.get('save-prefix')
}
return rangeDescriptor + version
} else if (requested.type === 'directory' || requested.type === 'file') {
return 'file:' + unixFormatPath(path.relative(tree.path, requested.fetchSpec))
} else {
return requested.saveSpec || requested.rawSpec
}
}
function moduleNameMatches (name) {
return function (child) { return moduleName(child) === name }
}
// while this implementation does not require async calling, doing so
// gives this a consistent interface with loadDeps et al
exports.removeDeps = function (args, tree, saveToDependencies, next) {
validate('AOSF|AOZF', [args, tree, saveToDependencies, next])
for (let pkg of args) {
var pkgName = moduleName(pkg)
var toRemove = tree.children.filter(moduleNameMatches(pkgName))
var pkgToRemove = toRemove[0] || createChild({package: {name: pkgName}})
var saveType = getSaveType(tree, pkg) || 'dependencies'
if (tree.isTop && saveToDependencies) {
pkgToRemove.save = saveType
}
if (tree.package[saveType][pkgName]) {
delete tree.package[saveType][pkgName]
if (saveType === 'optionalDependencies' && tree.package.dependencies[pkgName]) {
delete tree.package.dependencies[pkgName]
}
}
replaceModuleByPath(tree, 'removedChildren', pkgToRemove)
for (let parent of pkgToRemove.requiredBy) {
parent.requires = parent.requires.filter((child) => child !== pkgToRemove)
}
pkgToRemove.requiredBy = pkgToRemove.requiredBy.filter((parent) => parent !== tree)
}
next()
}
exports.removeExtraneous = function (args, tree, next) {
for (let pkg of args) {
var pkgName = moduleName(pkg)
var toRemove = tree.children.filter(moduleNameMatches(pkgName))
if (toRemove.length) {
removeObsoleteDep(toRemove[0])
}
}
next()
}
function andForEachChild (load, next) {
validate('F', [next])
next = dezalgo(next)
return function (er, children, logs) {
// when children is empty, logs won't be passed in at all (asyncMap is weird)
// so shortcircuit before arg validation
if (!er && (!children || children.length === 0)) return next()
validate('EAA', arguments)
if (er) return next(er)
assert(children.length === logs.length)
var cmds = []
for (var ii = 0; ii < children.length; ++ii) {
cmds.push([load, children[ii], logs[ii]])
}
var sortedCmds = cmds.sort(function installOrder (aa, bb) {
return moduleName(aa[1]).localeCompare(moduleName(bb[1]))
})
chain(sortedCmds, next)
}
}
function isDepOptional (tree, name, pkg) {
if (pkg.package && pkg.package._optional) return true
if (!tree.package.optionalDependencies) return false
if (tree.package.optionalDependencies[name] != null) return true
return false
}
exports.failedDependency = failedDependency
function failedDependency (tree, name, pkg) {
if (name) {
if (isDepOptional(tree, name, pkg || {})) {
return false
}
}
tree.failed = true
if (tree.isTop) return true
if (tree.userRequired) return true
if (!tree.requiredBy) return false
let anyFailed = false
for (var ii = 0; ii < tree.requiredBy.length; ++ii) {
var requireParent = tree.requiredBy[ii]
if (failedDependency(requireParent, moduleName(tree), tree)) {
anyFailed = true
}
}
return anyFailed
}
function andHandleOptionalErrors (log, tree, name, done) {
validate('OOSF', arguments)
return function (er, child, childLog) {
if (!er) validate('OO', [child, childLog])
if (!er) return done(er, child, childLog)
var isFatal = failedDependency(tree, name)
if (er && !isFatal) {
reportOptionalFailure(tree, name, er)
return done()
} else {
return done(er, child, childLog)
}
}
}
exports.prefetchDeps = prefetchDeps
function prefetchDeps (tree, deps, log, next) {
validate('OOOF', arguments)
var skipOptional = !npm.config.get('optional')
var seen = new Set()
const finished = andFinishTracker(log, next)
const fpm = BB.promisify(fetchPackageMetadata)
resolveBranchDeps(tree.package, deps).then(
() => finished(), finished
)
function resolveBranchDeps (pkg, deps) {
return BB.resolve(null).then(() => {
var allDependencies = Object.keys(deps).map((dep) => {
return npa.resolve(dep, deps[dep])
}).filter((dep) => {
return isRegistry(dep) &&
!seen.has(dep.toString()) &&
!findRequirement(tree, dep.name, dep)
})
if (skipOptional) {
var optDeps = pkg.optionalDependencies || {}
allDependencies = allDependencies.filter((dep) => !optDeps[dep.name])
}
return BB.map(allDependencies, (dep) => {
seen.add(dep.toString())
return fpm(dep, '', {tracker: log.newItem('fetchMetadata')}).then(
(pkg) => {
return pkg && pkg.dependencies && resolveBranchDeps(pkg, pkg.dependencies)
},
() => null
)
})
})
}
}
// Load any missing dependencies in the given tree
exports.loadDeps = loadDeps
function loadDeps (tree, log, next) {
validate('OOF', arguments)
if (tree.loaded || (tree.parent && tree.parent.failed) || tree.removed) return andFinishTracker.now(log, next)
if (tree.parent) tree.loaded = true
if (!tree.package.dependencies) tree.package.dependencies = {}
asyncMap(Object.keys(tree.package.dependencies), function (dep, done) {
var version = tree.package.dependencies[dep]
if (tree.package.optionalDependencies &&
tree.package.optionalDependencies[dep] &&
!npm.config.get('optional')) {
return done()
}
addDependency(dep, version, tree, log.newGroup('loadDep:' + dep), andHandleOptionalErrors(log, tree, dep, done))
}, andForEachChild(loadDeps, andFinishTracker(log, next)))
}
// Load development dependencies into the given tree
exports.loadDevDeps = function (tree, log, next) {
validate('OOF', arguments)
if (!tree.package.devDependencies) return andFinishTracker.now(log, next)
asyncMap(Object.keys(tree.package.devDependencies), function (dep, done) {
// things defined as both dev dependencies and regular dependencies are treated
// as the former
if (tree.package.dependencies[dep]) return done()
var logGroup = log.newGroup('loadDevDep:' + dep)
addDependency(dep, tree.package.devDependencies[dep], tree, logGroup, done)
}, andForEachChild(loadDeps, andFinishTracker(log, next)))
}
var loadExtraneous = exports.loadExtraneous = function (tree, log, next) {
var seen = new Set()
function loadExtraneous (tree) {
if (seen.has(tree)) return
seen.add(tree)
for (var child of tree.children) {
if (child.loaded) continue
resolveWithExistingModule(child, tree)
loadExtraneous(child)
}
}
loadExtraneous(tree)
log.finish()
next()
}
exports.loadExtraneous.andResolveDeps = function (tree, log, next) {
validate('OOF', arguments)
// For canonicalized trees (eg from shrinkwrap) we don't want to bother
// resolving the dependencies of extraneous deps.
if (tree.loaded) return loadExtraneous(tree, log, next)
asyncMap(tree.children.filter(function (child) { return !child.loaded }), function (child, done) {
resolveWithExistingModule(child, tree)
done(null, child, log)
}, andForEachChild(loadDeps, andFinishTracker(log, next)))
}
function addDependency (name, versionSpec, tree, log, done) {
validate('SSOOF', arguments)
var next = andAddParentToErrors(tree, done)
try {
var req = childDependencySpecifier(tree, name, versionSpec)
if (tree.swRequires && tree.swRequires[name]) {
var swReq = childDependencySpecifier(tree, name, tree.swRequires[name])
}
} catch (err) {
return done(err)
}
var child = findRequirement(tree, name, req)
if (!child && swReq) child = findRequirement(tree, name, swReq)
if (child) {
resolveWithExistingModule(child, tree)
if (child.package._shrinkwrap === undefined) {
readShrinkwrap.andInflate(child, function (er) { next(er, child, log) })
} else {
next(null, child, log)
}
} else {
fetchPackageMetadata(req, packageRelativePath(tree), {tracker: log.newItem('fetchMetadata')}, iferr(next, function (pkg) {
resolveWithNewModule(pkg, tree, log, next)
}))
}
}
function resolveWithExistingModule (child, tree) {
validate('OO', arguments)
addRequiredDep(tree, child)
if (tree.parent && child.parent !== tree) updatePhantomChildren(tree.parent, child)
}
var updatePhantomChildren = exports.updatePhantomChildren = function (current, child) {
validate('OO', arguments)
while (current && current !== child.parent) {
if (!current.phantomChildren) current.phantomChildren = {}
current.phantomChildren[moduleName(child)] = child
current = current.parent
}
}
exports._replaceModuleByPath = replaceModuleByPath
function replaceModuleByPath (obj, key, child) {
return replaceModule(obj, key, child, function (replacing, child) {
return replacing.path === child.path
})
}
exports._replaceModuleByName = replaceModuleByName
function replaceModuleByName (obj, key, child) {
var childName = moduleName(child)
return replaceModule(obj, key, child, function (replacing, child) {
return moduleName(replacing) === childName
})
}
function replaceModule (obj, key, child, matchBy) {
validate('OSOF', arguments)
if (!obj[key]) obj[key] = []
// we replace children with a new array object instead of mutating it
// because mutating it results in weird failure states.
// I would very much like to know _why_ this is. =/
var children = [].concat(obj[key])
for (var replaceAt = 0; replaceAt < children.length; ++replaceAt) {
if (matchBy(children[replaceAt], child)) break
}
var replacing = children.splice(replaceAt, 1, child)
obj[key] = children
return replacing[0]
}
function resolveWithNewModule (pkg, tree, log, next) {
validate('OOOF', arguments)
log.silly('resolveWithNewModule', packageId(pkg), 'checking installable status')
return isInstallable(pkg, (err) => {
let installable = !err
addBundled(pkg, (bundleErr) => {
var parent = earliestInstallable(tree, tree, pkg) || tree
var isLink = pkg._requested.type === 'directory'
var child = createChild({
package: pkg,
parent: parent,
path: path.join(parent.isLink ? parent.realpath : parent.path, 'node_modules', pkg.name),
realpath: isLink ? pkg._requested.fetchSpec : path.join(parent.realpath, 'node_modules', pkg.name),
children: pkg._bundled || [],
isLink: isLink,
isInLink: parent.isLink,
knownInstallable: installable
})
if (!installable || bundleErr) child.failed = true
delete pkg._bundled
var hasBundled = child.children.length
var replaced = replaceModuleByName(parent, 'children', child)
if (replaced) removeObsoleteDep(replaced)
addRequiredDep(tree, child)
child.location = flatNameFromTree(child)
if (tree.parent && parent !== tree) updatePhantomChildren(tree.parent, child)
if (hasBundled) {
inflateBundled(child, child, child.children)
}
if (pkg._shrinkwrap && pkg._shrinkwrap.dependencies) {
return inflateShrinkwrap(child, pkg._shrinkwrap, (swErr) => {
if (swErr) child.failed = true
next(err || bundleErr || swErr, child, log)
})
}
next(err || bundleErr, child, log)
})
})
}
var validatePeerDeps = exports.validatePeerDeps = function (tree, onInvalid) {
if (!tree.package.peerDependencies) return
Object.keys(tree.package.peerDependencies).forEach(function (pkgname) {
var version = tree.package.peerDependencies[pkgname]
try {
var spec = npa.resolve(pkgname, version)
} catch (e) {}
var match = spec && findRequirement(tree.parent || tree, pkgname, spec)
if (!match) onInvalid(tree, pkgname, version)
})
}
exports.validateAllPeerDeps = function (tree, onInvalid) {
validateAllPeerDeps(tree, onInvalid, new Set())
}
function validateAllPeerDeps (tree, onInvalid, seen) {
validate('OFO', arguments)
if (seen.has(tree)) return
seen.add(tree)
validatePeerDeps(tree, onInvalid)
tree.children.forEach(function (child) { validateAllPeerDeps(child, onInvalid, seen) })
}
// Determine if a module requirement is already met by the tree at or above
// our current location in the tree.
var findRequirement = exports.findRequirement = function (tree, name, requested, requestor) {
validate('OSO', [tree, name, requested])
if (!requestor) requestor = tree
var nameMatch = function (child) {
return moduleName(child) === name && child.parent && !child.removed
}
var versionMatch = function (child) {
return doesChildVersionMatch(child, requested, requestor)
}
if (nameMatch(tree)) {
// this *is* the module, but it doesn't match the version, so a
// new copy will have to be installed
return versionMatch(tree) ? tree : null
}
var matches = tree.children.filter(nameMatch)
if (matches.length) {
matches = matches.filter(versionMatch)
// the module exists as a dependent, but the version doesn't match, so
// a new copy will have to be installed above here
if (matches.length) return matches[0]
return null
}
if (tree.isTop) return null
if (!preserveSymlinks() && /^[.][.][\\/]/.test(path.relative(tree.parent.realpath, tree.realpath))) return null
return findRequirement(tree.parent, name, requested, requestor)
}
function preserveSymlinks () {
if (!('NODE_PRESERVE_SYMLINKS' in process.env)) return false
const value = process.env.NODE_PRESERVE_SYMLINKS
if (value == null || value === '' || value === 'false' || value === 'no' || value === '0') return false
return true
}
// Find the highest level in the tree that we can install this module in.
// If the module isn't installed above us yet, that'd be the very top.
// If it is, then it's the level below where its installed.
var earliestInstallable = exports.earliestInstallable = function (requiredBy, tree, pkg) {
validate('OOO', arguments)
function undeletedModuleMatches (child) {
return !child.removed && moduleName(child) === pkg.name
}
if (tree.children.some(undeletedModuleMatches)) return null
// If any of the children of this tree have conflicting
// binaries then we need to decline to install this package here.
var binaryMatches = pkg.bin && tree.children.some(function (child) {
if (child.removed || !child.package.bin) return false
return Object.keys(child.package.bin).some(function (bin) {
return pkg.bin[bin]
})
})
if (binaryMatches) return null
// if this tree location requested the same module then we KNOW it
// isn't compatible because if it were findRequirement would have
// found that version.
var deps = tree.package.dependencies || {}
if (!tree.removed && requiredBy !== tree && deps[pkg.name]) {
return null
}
var devDeps = tree.package.devDependencies || {}
if (tree.isTop && devDeps[pkg.name]) {
var requested = childDependencySpecifier(tree, pkg.name, devDeps[pkg.name])
if (!doesChildVersionMatch({package: pkg}, requested, tree)) {
return null
}
}
if (tree.phantomChildren && tree.phantomChildren[pkg.name]) return null
if (tree.isTop) return tree
if (tree.isGlobal) return tree
if (npm.config.get('global-style') && tree.parent.isTop) return tree
if (npm.config.get('legacy-bundling')) return tree
if (!preserveSymlinks() && /^[.][.][\\/]/.test(path.relative(tree.parent.realpath, tree.realpath))) return tree
return (earliestInstallable(requiredBy, tree.parent, pkg) || tree)
}