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build-ideal-tree.js
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build-ideal-tree.js
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// mixin implementing the buildIdealTree method
const localeCompare = require('@isaacs/string-locale-compare')('en')
const rpj = require('read-package-json-fast')
const npa = require('npm-package-arg')
const pacote = require('pacote')
const cacache = require('cacache')
const promiseCallLimit = require('promise-call-limit')
const realpath = require('../../lib/realpath.js')
const { resolve, dirname } = require('path')
const { promisify } = require('util')
const treeCheck = require('../tree-check.js')
const readdir = promisify(require('readdir-scoped-modules'))
const fs = require('fs')
const lstat = promisify(fs.lstat)
const readlink = promisify(fs.readlink)
const { depth } = require('treeverse')
const {
OK,
REPLACE,
CONFLICT,
} = require('../can-place-dep.js')
const PlaceDep = require('../place-dep.js')
const debug = require('../debug.js')
const fromPath = require('../from-path.js')
const calcDepFlags = require('../calc-dep-flags.js')
const Shrinkwrap = require('../shrinkwrap.js')
const { defaultLockfileVersion } = Shrinkwrap
const Node = require('../node.js')
const Link = require('../link.js')
const addRmPkgDeps = require('../add-rm-pkg-deps.js')
const optionalSet = require('../optional-set.js')
const { checkEngine, checkPlatform } = require('npm-install-checks')
const relpath = require('../relpath.js')
// note: some of these symbols are shared so we can hit
// them with unit tests and reuse them across mixins
const _complete = Symbol('complete')
const _depsSeen = Symbol('depsSeen')
const _depsQueue = Symbol('depsQueue')
const _currentDep = Symbol('currentDep')
const _updateAll = Symbol('updateAll')
const _mutateTree = Symbol('mutateTree')
const _flagsSuspect = Symbol.for('flagsSuspect')
const _workspaces = Symbol.for('workspaces')
const _prune = Symbol('prune')
const _preferDedupe = Symbol('preferDedupe')
const _legacyBundling = Symbol('legacyBundling')
const _parseSettings = Symbol('parseSettings')
const _initTree = Symbol('initTree')
const _applyUserRequests = Symbol('applyUserRequests')
const _applyUserRequestsToNode = Symbol('applyUserRequestsToNode')
const _inflateAncientLockfile = Symbol('inflateAncientLockfile')
const _buildDeps = Symbol('buildDeps')
const _buildDepStep = Symbol('buildDepStep')
const _nodeFromEdge = Symbol('nodeFromEdge')
const _nodeFromSpec = Symbol('nodeFromSpec')
const _fetchManifest = Symbol('fetchManifest')
const _problemEdges = Symbol('problemEdges')
const _manifests = Symbol('manifests')
const _loadWorkspaces = Symbol.for('loadWorkspaces')
const _linkFromSpec = Symbol('linkFromSpec')
const _loadPeerSet = Symbol('loadPeerSet')
const _updateNames = Symbol.for('updateNames')
const _fixDepFlags = Symbol('fixDepFlags')
const _resolveLinks = Symbol('resolveLinks')
const _rootNodeFromPackage = Symbol('rootNodeFromPackage')
const _add = Symbol('add')
const _resolvedAdd = Symbol.for('resolvedAdd')
const _queueNamedUpdates = Symbol('queueNamedUpdates')
const _queueVulnDependents = Symbol('queueVulnDependents')
const _avoidRange = Symbol('avoidRange')
const _shouldUpdateNode = Symbol('shouldUpdateNode')
const resetDepFlags = require('../reset-dep-flags.js')
const _loadFailures = Symbol('loadFailures')
const _pruneFailedOptional = Symbol('pruneFailedOptional')
const _linkNodes = Symbol('linkNodes')
const _follow = Symbol('follow')
const _globalStyle = Symbol('globalStyle')
const _globalRootNode = Symbol('globalRootNode')
const _isVulnerable = Symbol.for('isVulnerable')
const _usePackageLock = Symbol.for('usePackageLock')
const _rpcache = Symbol.for('realpathCache')
const _stcache = Symbol.for('statCache')
const _updateFilePath = Symbol('updateFilePath')
const _followSymlinkPath = Symbol('followSymlinkPath')
const _getRelpathSpec = Symbol('getRelpathSpec')
const _retrieveSpecName = Symbol('retrieveSpecName')
const _strictPeerDeps = Symbol('strictPeerDeps')
const _checkEngineAndPlatform = Symbol('checkEngineAndPlatform')
const _checkEngine = Symbol('checkEngine')
const _checkPlatform = Symbol('checkPlatform')
const _virtualRoots = Symbol('virtualRoots')
const _virtualRoot = Symbol('virtualRoot')
const _includeWorkspaceRoot = Symbol.for('includeWorkspaceRoot')
const _failPeerConflict = Symbol('failPeerConflict')
const _explainPeerConflict = Symbol('explainPeerConflict')
const _edgesOverridden = Symbol('edgesOverridden')
// exposed symbol for unit testing the placeDep method directly
const _peerSetSource = Symbol.for('peerSetSource')
// used by Reify mixin
const _force = Symbol.for('force')
const _explicitRequests = Symbol('explicitRequests')
const _global = Symbol.for('global')
const _idealTreePrune = Symbol.for('idealTreePrune')
module.exports = cls => class IdealTreeBuilder extends cls {
constructor (options) {
super(options)
// normalize trailing slash
const registry = options.registry || 'https://registry.npmjs.org'
options.registry = this.registry = registry.replace(/\/+$/, '') + '/'
const {
follow = false,
force = false,
global = false,
globalStyle = false,
idealTree = null,
includeWorkspaceRoot = false,
legacyPeerDeps = false,
packageLock = true,
strictPeerDeps = false,
workspaces = [],
} = options
this[_workspaces] = workspaces || []
this[_force] = !!force
this[_strictPeerDeps] = !!strictPeerDeps
this.idealTree = idealTree
this.legacyPeerDeps = legacyPeerDeps
this[_usePackageLock] = packageLock
this[_global] = !!global
this[_globalStyle] = this[_global] || globalStyle
this[_follow] = !!follow
if (this[_workspaces].length && this[_global]) {
throw new Error('Cannot operate on workspaces in global mode')
}
this[_explicitRequests] = new Set()
this[_preferDedupe] = false
this[_legacyBundling] = false
this[_depsSeen] = new Set()
this[_depsQueue] = []
this[_currentDep] = null
this[_updateNames] = []
this[_updateAll] = false
this[_mutateTree] = false
this[_loadFailures] = new Set()
this[_linkNodes] = new Set()
this[_manifests] = new Map()
this[_edgesOverridden] = new Set()
this[_resolvedAdd] = []
// a map of each module in a peer set to the thing that depended on
// that set of peers in the first place. Use a WeakMap so that we
// don't hold onto references for nodes that are garbage collected.
this[_peerSetSource] = new WeakMap()
this[_virtualRoots] = new Map()
this[_includeWorkspaceRoot] = includeWorkspaceRoot
}
get explicitRequests () {
return new Set(this[_explicitRequests])
}
// public method
async buildIdealTree (options = {}) {
if (this.idealTree) {
return Promise.resolve(this.idealTree)
}
// allow the user to set reify options on the ctor as well.
// XXX: deprecate separate reify() options object.
options = { ...this.options, ...options }
// an empty array or any falsey value is the same as null
if (!options.add || options.add.length === 0) {
options.add = null
}
if (!options.rm || options.rm.length === 0) {
options.rm = null
}
process.emit('time', 'idealTree')
if (!options.add && !options.rm && !options.update && this[_global]) {
const er = new Error('global requires add, rm, or update option')
return Promise.reject(er)
}
// first get the virtual tree, if possible. If there's a lockfile, then
// that defines the ideal tree, unless the root package.json is not
// satisfied by what the ideal tree provides.
// from there, we start adding nodes to it to satisfy the deps requested
// by the package.json in the root.
this[_parseSettings](options)
// start tracker block
this.addTracker('idealTree')
try {
await this[_initTree]()
await this[_inflateAncientLockfile]()
await this[_applyUserRequests](options)
await this[_buildDeps]()
await this[_fixDepFlags]()
await this[_pruneFailedOptional]()
await this[_checkEngineAndPlatform]()
} finally {
process.emit('timeEnd', 'idealTree')
this.finishTracker('idealTree')
}
return treeCheck(this.idealTree)
}
async [_checkEngineAndPlatform] () {
for (const node of this.idealTree.inventory.values()) {
if (!node.optional) {
this[_checkEngine](node)
this[_checkPlatform](node)
}
}
}
[_checkPlatform] (node) {
checkPlatform(node.package, this[_force])
}
[_checkEngine] (node) {
const { engineStrict, npmVersion, nodeVersion } = this.options
const c = () =>
checkEngine(node.package, npmVersion, nodeVersion, this[_force])
if (engineStrict) {
c()
} else {
try {
c()
} catch (er) {
this.log.warn(er.code, er.message, {
package: er.pkgid,
required: er.required,
current: er.current,
})
}
}
}
[_parseSettings] (options) {
const update = options.update === true ? { all: true }
: Array.isArray(options.update) ? { names: options.update }
: options.update || {}
if (update.all || !Array.isArray(update.names)) {
update.names = []
}
this[_complete] = !!options.complete
this[_preferDedupe] = !!options.preferDedupe
this[_legacyBundling] = !!options.legacyBundling
this[_updateNames] = update.names
this[_updateAll] = update.all
// we prune by default unless explicitly set to boolean false
this[_prune] = options.prune !== false
// set if we add anything, but also set here if we know we'll make
// changes and thus have to maybe prune later.
this[_mutateTree] = !!(
options.add ||
options.rm ||
update.all ||
update.names.length
)
}
// load the initial tree, either the virtualTree from a shrinkwrap,
// or just the root node from a package.json
[_initTree] () {
process.emit('time', 'idealTree:init')
return (
this[_global] ? this[_globalRootNode]()
: rpj(this.path + '/package.json').then(
pkg => this[_rootNodeFromPackage](pkg),
er => {
if (er.code === 'EJSONPARSE') {
throw er
}
return this[_rootNodeFromPackage]({})
}
))
.then(root => this[_loadWorkspaces](root))
// ok to not have a virtual tree. probably initial install.
// When updating all, we load the shrinkwrap, but don't bother
// to build out the full virtual tree from it, since we'll be
// reconstructing it anyway.
.then(root => this[_global] ? root
: !this[_usePackageLock] || this[_updateAll]
? Shrinkwrap.reset({
path: this.path,
lockfileVersion: this.options.lockfileVersion,
}).then(meta => Object.assign(root, { meta }))
: this.loadVirtual({ root }))
// if we don't have a lockfile to go from, then start with the
// actual tree, so we only make the minimum required changes.
// don't do this for global installs or updates, because in those
// cases we don't use a lockfile anyway.
// Load on a new Arborist object, so the Nodes aren't the same,
// or else it'll get super confusing when we change them!
.then(async root => {
if (!this[_updateAll] && !this[_global] && !root.meta.loadedFromDisk) {
await new this.constructor(this.options).loadActual({ root })
const tree = root.target
// even though we didn't load it from a package-lock.json FILE,
// we still loaded it "from disk", meaning we have to reset
// dep flags before assuming that any mutations were reflected.
if (tree.children.size) {
root.meta.loadedFromDisk = true
// set these so that we don't try to ancient lockfile reload it
root.meta.originalLockfileVersion = defaultLockfileVersion
root.meta.lockfileVersion = defaultLockfileVersion
}
}
return root
})
.then(tree => {
// null the virtual tree, because we're about to hack away at it
// if you want another one, load another copy.
this.idealTree = tree
this.virtualTree = null
process.emit('timeEnd', 'idealTree:init')
})
}
async [_globalRootNode] () {
const root = await this[_rootNodeFromPackage]({ dependencies: {} })
// this is a gross kludge to handle the fact that we don't save
// metadata on the root node in global installs, because the "root"
// node is something like /usr/local/lib.
const meta = new Shrinkwrap({
path: this.path,
lockfileVersion: this.options.lockfileVersion,
})
meta.reset()
root.meta = meta
return root
}
async [_rootNodeFromPackage] (pkg) {
// if the path doesn't exist, then we explode at this point. Note that
// this is not a problem for reify(), since it creates the root path
// before ever loading trees.
// TODO: make buildIdealTree() and loadActual handle a missing root path,
// or a symlink to a missing target, and let reify() create it as needed.
const real = await realpath(this.path, this[_rpcache], this[_stcache])
const Cls = real === this.path ? Node : Link
const root = new Cls({
path: this.path,
realpath: real,
pkg,
extraneous: false,
dev: false,
devOptional: false,
peer: false,
optional: false,
global: this[_global],
legacyPeerDeps: this.legacyPeerDeps,
loadOverrides: true,
})
if (root.isLink) {
root.target = new Node({
path: real,
realpath: real,
pkg,
extraneous: false,
dev: false,
devOptional: false,
peer: false,
optional: false,
global: this[_global],
legacyPeerDeps: this.legacyPeerDeps,
root,
})
}
return root
}
// process the add/rm requests by modifying the root node, and the
// update.names request by queueing nodes dependent on those named.
async [_applyUserRequests] (options) {
process.emit('time', 'idealTree:userRequests')
const tree = this.idealTree.target
if (!this[_workspaces].length) {
await this[_applyUserRequestsToNode](tree, options)
} else {
const nodes = this.workspaceNodes(tree, this[_workspaces])
if (this[_includeWorkspaceRoot]) {
nodes.push(tree)
}
const appliedRequests = nodes.map(
node => this[_applyUserRequestsToNode](node, options)
)
await Promise.all(appliedRequests)
}
process.emit('timeEnd', 'idealTree:userRequests')
}
async [_applyUserRequestsToNode] (tree, options) {
// If we have a list of package names to update, and we know it's
// going to update them wherever they are, add any paths into those
// named nodes to the buildIdealTree queue.
if (!this[_global] && this[_updateNames].length) {
this[_queueNamedUpdates]()
}
// global updates only update the globalTop nodes, but we need to know
// that they're there, and not reinstall the world unnecessarily.
const globalExplicitUpdateNames = []
if (this[_global] && (this[_updateAll] || this[_updateNames].length)) {
const nm = resolve(this.path, 'node_modules')
for (const name of await readdir(nm).catch(() => [])) {
tree.package.dependencies = tree.package.dependencies || {}
const updateName = this[_updateNames].includes(name)
if (this[_updateAll] || updateName) {
if (updateName) {
globalExplicitUpdateNames.push(name)
}
const dir = resolve(nm, name)
const st = await lstat(dir)
.catch(/* istanbul ignore next */ er => null)
if (st && st.isSymbolicLink()) {
const target = await readlink(dir)
const real = resolve(dirname(dir), target)
tree.package.dependencies[name] = `file:${real}`
} else {
tree.package.dependencies[name] = '*'
}
}
}
}
if (this.auditReport && this.auditReport.size > 0) {
await this[_queueVulnDependents](options)
}
const { add, rm } = options
if (rm && rm.length) {
addRmPkgDeps.rm(tree.package, rm)
for (const name of rm) {
this[_explicitRequests].add({ from: tree, name, action: 'DELETE' })
}
}
if (add && add.length) {
await this[_add](tree, options)
}
// triggers a refresh of all edgesOut. this has to be done BEFORE
// adding the edges to explicitRequests, because the package setter
// resets all edgesOut.
if (add && add.length || rm && rm.length || this[_global]) {
tree.package = tree.package
}
for (const spec of this[_resolvedAdd]) {
if (spec.tree === tree) {
this[_explicitRequests].add(tree.edgesOut.get(spec.name))
}
}
for (const name of globalExplicitUpdateNames) {
this[_explicitRequests].add(tree.edgesOut.get(name))
}
this[_depsQueue].push(tree)
}
// This returns a promise because we might not have the name yet,
// and need to call pacote.manifest to find the name.
[_add] (tree, { add, saveType = null, saveBundle = false }) {
// get the name for each of the specs in the list.
// ie, doing `foo@bar` we just return foo
// but if it's a url or git, we don't know the name until we
// fetch it and look in its manifest.
return Promise.all(add.map(async rawSpec => {
// We do NOT provide the path to npa here, because user-additions
// need to be resolved relative to the CWD the user is in.
const spec = await this[_retrieveSpecName](npa(rawSpec))
.then(spec => this[_updateFilePath](spec))
.then(spec => this[_followSymlinkPath](spec))
spec.tree = tree
return spec
})).then(add => {
this[_resolvedAdd].push(...add)
// now add is a list of spec objects with names.
// find a home for each of them!
addRmPkgDeps.add({
pkg: tree.package,
add,
saveBundle,
saveType,
path: this.path,
log: this.log,
})
})
}
async [_retrieveSpecName] (spec) {
// if it's just @'' then we reload whatever's there, or get latest
// if it's an explicit tag, we need to install that specific tag version
const isTag = spec.rawSpec && spec.type === 'tag'
if (spec.name && !isTag) {
return spec
}
const mani = await pacote.manifest(spec, { ...this.options })
// if it's a tag type, then we need to run it down to an actual version
if (isTag) {
return npa(`${mani.name}@${mani.version}`)
}
spec.name = mani.name
return spec
}
async [_updateFilePath] (spec) {
if (spec.type === 'file') {
return this[_getRelpathSpec](spec, spec.fetchSpec)
}
return spec
}
async [_followSymlinkPath] (spec) {
if (spec.type === 'directory') {
const real = await (
realpath(spec.fetchSpec, this[_rpcache], this[_stcache])
// TODO: create synthetic test case to simulate realpath failure
.catch(/* istanbul ignore next */() => null)
)
return this[_getRelpathSpec](spec, real)
}
return spec
}
[_getRelpathSpec] (spec, filepath) {
/* istanbul ignore else - should also be covered by realpath failure */
if (filepath) {
const { name } = spec
const tree = this.idealTree.target
spec = npa(`file:${relpath(tree.path, filepath)}`, tree.path)
spec.name = name
}
return spec
}
// TODO: provide a way to fix bundled deps by exposing metadata about
// what's in the bundle at each published manifest. Without that, we
// can't possibly fix bundled deps without breaking a ton of other stuff,
// and leaving the user subject to getting it overwritten later anyway.
async [_queueVulnDependents] (options) {
for (const vuln of this.auditReport.values()) {
for (const node of vuln.nodes) {
const bundler = node.getBundler()
// XXX this belongs in the audit report itself, not here.
// We shouldn't even get these things here, and they shouldn't
// be printed by npm-audit-report as if they can be fixed, because
// they can't.
if (bundler) {
this.log.warn(`audit fix ${node.name}@${node.version}`,
`${node.location}\nis a bundled dependency of\n${
bundler.name}@${bundler.version} at ${bundler.location}\n` +
'It cannot be fixed automatically.\n' +
`Check for updates to the ${bundler.name} package.`)
continue
}
for (const edge of node.edgesIn) {
this.addTracker('idealTree', edge.from.name, edge.from.location)
this[_depsQueue].push(edge.from)
}
}
}
// note any that can't be fixed at the root level without --force
// if there's a fix, we use that. otherwise, the user has to remove it,
// find a different thing, fix the upstream, etc.
//
// XXX: how to handle top nodes that aren't the root? Maybe the report
// just tells the user to cd into that directory and fix it?
if (this[_force] && this.auditReport && this.auditReport.topVulns.size) {
options.add = options.add || []
options.rm = options.rm || []
const nodesTouched = new Set()
for (const [name, topVuln] of this.auditReport.topVulns.entries()) {
const {
simpleRange,
topNodes,
fixAvailable,
} = topVuln
for (const node of topNodes) {
if (!node.isProjectRoot && !node.isWorkspace) {
// not something we're going to fix, sorry. have to cd into
// that directory and fix it yourself.
this.log.warn('audit', 'Manual fix required in linked project ' +
`at ./${node.location} for ${name}@${simpleRange}.\n` +
`'cd ./${node.location}' and run 'npm audit' for details.`)
continue
}
if (!fixAvailable) {
this.log.warn('audit', `No fix available for ${name}@${simpleRange}`)
continue
}
const { isSemVerMajor, version } = fixAvailable
const breakingMessage = isSemVerMajor
? 'a SemVer major change'
: 'outside your stated dependency range'
this.log.warn('audit', `Updating ${name} to ${version},` +
`which is ${breakingMessage}.`)
await this[_add](node, { add: [`${name}@${version}`] })
nodesTouched.add(node)
}
}
for (const node of nodesTouched) {
node.package = node.package
}
}
}
[_isVulnerable] (node) {
return this.auditReport && this.auditReport.isVulnerable(node)
}
[_avoidRange] (name) {
if (!this.auditReport) {
return null
}
const vuln = this.auditReport.get(name)
if (!vuln) {
return null
}
return vuln.range
}
[_queueNamedUpdates] () {
// ignore top nodes, since they are not loaded the same way, and
// probably have their own project associated with them.
// for every node with one of the names on the list, we add its
// dependents to the queue to be evaluated. in buildDepStep,
// anything on the update names list will get refreshed, even if
// it isn't a problem.
// XXX this could be faster by doing a series of inventory.query('name')
// calls rather than walking over everything in the tree.
const set = this.idealTree.inventory
.filter(n => this[_shouldUpdateNode](n))
// XXX add any invalid edgesOut to the queue
for (const node of set) {
for (const edge of node.edgesIn) {
this.addTracker('idealTree', edge.from.name, edge.from.location)
this[_depsQueue].push(edge.from)
}
}
}
[_shouldUpdateNode] (node) {
return this[_updateNames].includes(node.name) &&
!node.isTop &&
!node.inDepBundle &&
!node.inShrinkwrap
}
async [_inflateAncientLockfile] () {
const { meta, inventory } = this.idealTree
const ancient = meta.ancientLockfile
const old = meta.loadedFromDisk && !(meta.originalLockfileVersion >= 2)
if (inventory.size === 0 || !ancient && !old) {
return
}
// if the lockfile is from node v5 or earlier, then we'll have to reload
// all the manifests of everything we encounter. this is costly, but at
// least it's just a one-time hit.
process.emit('time', 'idealTree:inflate')
// don't warn if we're not gonna actually write it back anyway.
const heading = ancient ? 'ancient lockfile' : 'old lockfile'
if (ancient || !this.options.lockfileVersion ||
this.options.lockfileVersion >= defaultLockfileVersion) {
this.log.warn(heading,
`
The ${meta.type} file was created with an old version of npm,
so supplemental metadata must be fetched from the registry.
This is a one-time fix-up, please be patient...
`)
}
this.addTracker('idealTree:inflate')
const queue = []
for (const node of inventory.values()) {
if (node.isProjectRoot) {
continue
}
queue.push(async () => {
this.log.silly('inflate', node.location)
const { resolved, version, path, name, location, integrity } = node
// don't try to hit the registry for linked deps
const useResolved = resolved && (
!version || resolved.startsWith('file:')
)
const id = useResolved ? resolved
: version || `file:${node.path}`
const spec = npa.resolve(name, id, dirname(path))
const sloc = location.substr('node_modules/'.length)
const t = `idealTree:inflate:${sloc}`
this.addTracker(t)
await pacote.manifest(spec, {
...this.options,
resolved: resolved,
integrity: integrity,
fullMetadata: false,
}).then(mani => {
node.package = { ...mani, _id: `${mani.name}@${mani.version}` }
}).catch((er) => {
const warning = `Could not fetch metadata for ${name}@${id}`
this.log.warn(heading, warning, er)
})
this.finishTracker(t)
})
}
await promiseCallLimit(queue)
// have to re-calc dep flags, because the nodes don't have edges
// until their packages get assigned, so everything looks extraneous
calcDepFlags(this.idealTree)
// yes, yes, this isn't the "original" version, but now that it's been
// upgraded, we need to make sure we don't do the work to upgrade it
// again, since it's now as new as can be.
meta.originalLockfileVersion = defaultLockfileVersion
this.finishTracker('idealTree:inflate')
process.emit('timeEnd', 'idealTree:inflate')
}
// at this point we have a virtual tree with the actual root node's
// package deps, which may be partly or entirely incomplete, invalid
// or extraneous.
[_buildDeps] () {
process.emit('time', 'idealTree:buildDeps')
const tree = this.idealTree.target
tree.assertRootOverrides()
this[_depsQueue].push(tree)
// XXX also push anything that depends on a node with a name
// in the override list
this.log.silly('idealTree', 'buildDeps')
this.addTracker('idealTree', tree.name, '')
return this[_buildDepStep]()
.then(() => process.emit('timeEnd', 'idealTree:buildDeps'))
}
async [_buildDepStep] () {
// removes tracker of previous dependency in the queue
if (this[_currentDep]) {
const { location, name } = this[_currentDep]
process.emit('timeEnd', `idealTree:${location || '#root'}`)
this.finishTracker('idealTree', name, location)
this[_currentDep] = null
}
if (!this[_depsQueue].length) {
return this[_resolveLinks]()
}
// sort physically shallower deps up to the front of the queue,
// because they'll affect things deeper in, then alphabetical
this[_depsQueue].sort((a, b) =>
(a.depth - b.depth) || localeCompare(a.path, b.path))
const node = this[_depsQueue].shift()
const bd = node.package.bundleDependencies
const hasBundle = bd && Array.isArray(bd) && bd.length
const { hasShrinkwrap } = node
// if the node was already visited, or has since been removed from the
// tree, skip over it and process the rest of the queue. If a node has
// a shrinkwrap, also skip it, because it's going to get its deps
// satisfied by whatever's in that file anyway.
if (this[_depsSeen].has(node) ||
node.root !== this.idealTree ||
hasShrinkwrap && !this[_complete]) {
return this[_buildDepStep]()
}
this[_depsSeen].add(node)
this[_currentDep] = node
process.emit('time', `idealTree:${node.location || '#root'}`)
// if we're loading a _complete_ ideal tree, for a --package-lock-only
// installation for example, we have to crack open the tarball and
// look inside if it has bundle deps or shrinkwraps. note that this is
// not necessary during a reification, because we just update the
// ideal tree by reading bundles/shrinkwraps in place.
// Don't bother if the node is from the actual tree and hasn't
// been resolved, because we can't fetch it anyway, could be anything!
const crackOpen = this[_complete] &&
node !== this.idealTree &&
node.resolved &&
(hasBundle || hasShrinkwrap)
if (crackOpen) {
const Arborist = this.constructor
const opt = { ...this.options }
await cacache.tmp.withTmp(this.cache, opt, async path => {
await pacote.extract(node.resolved, path, {
...opt,
resolved: node.resolved,
integrity: node.integrity,
})
if (hasShrinkwrap) {
await new Arborist({ ...this.options, path })
.loadVirtual({ root: node })
}
if (hasBundle) {
await new Arborist({ ...this.options, path })
.loadActual({ root: node, ignoreMissing: true })
}
})
}
// if any deps are missing or invalid, then we fetch the manifest for
// the thing we want, and build a new dep node from that.
// Then, find the ideal placement for that node. The ideal placement
// searches from the node's deps (or parent deps in the case of non-root
// peer deps), and walks up the tree until it finds the highest spot
// where it doesn't cause any conflicts.
//
// A conflict can be:
// - A node by that name already exists at that location.
// - The parent has a peer dep on that name
// - One of the node's peer deps conflicts at that location, unless the
// peer dep is met by a node at that location, which is fine.
//
// If we create a new node, then build its ideal deps as well.
//
// Note: this is the same "maximally naive" deduping tree-building
// algorithm that npm has used since v3. In a case like this:
//
// root -> (a@1, b@1||2)
// a -> (b@1)
//
// You'll end up with a tree like this:
//
// root
// +-- a@1
// | +-- b@1
// +-- b@2
//
// rather than this, more deduped, but just as correct tree:
//
// root
// +-- a@1
// +-- b@1
//
// Another way to look at it is that this algorithm favors getting higher
// version deps at higher levels in the tree, even if that reduces
// potential deduplication.
//
// Set `preferDedupe: true` in the options to replace the shallower
// dep if allowed.
const tasks = []
const peerSource = this[_peerSetSource].get(node) || node
for (const edge of this[_problemEdges](node)) {
if (edge.peerConflicted) {
continue
}
// peerSetSource is only relevant when we have a peerEntryEdge
// otherwise we're setting regular non-peer deps as if they have
// a virtual root of whatever brought in THIS node.
// so we VR the node itself if the edge is not a peer
const source = edge.peer ? peerSource : node
const virtualRoot = this[_virtualRoot](source, true)
// reuse virtual root if we already have one, but don't
// try to do the override ahead of time, since we MAY be able
// to create a more correct tree than the virtual root could.
const vrEdge = virtualRoot && virtualRoot.edgesOut.get(edge.name)
const vrDep = vrEdge && vrEdge.valid && vrEdge.to
// only re-use the virtualRoot if it's a peer edge we're placing.
// otherwise, we end up in situations where we override peer deps that
// we could have otherwise found homes for. Eg:
// xy -> (x, y)
// x -> PEER(z@1)
// y -> PEER(z@2)
// If xy is a dependency, we can resolve this like:
// project
// +-- xy
// | +-- y
// | +-- z@2
// +-- x
// +-- z@1
// But if x and y are loaded in the same virtual root, then they will
// be forced to agree on a version of z.
const required = new Set([edge.from])
const parent = edge.peer ? virtualRoot : null
const dep = vrDep && vrDep.satisfies(edge) ? vrDep
: await this[_nodeFromEdge](edge, parent, null, required)
/* istanbul ignore next */
debug(() => {
if (!dep) {
throw new Error('no dep??')
}
})
tasks.push({ edge, dep })
}
const placeDeps = tasks
.sort((a, b) => localeCompare(a.edge.name, b.edge.name))
.map(({ edge, dep }) => new PlaceDep({
edge,
dep,
explicitRequest: this[_explicitRequests].has(edge),
updateNames: this[_updateNames],
auditReport: this.auditReport,
force: this[_force],
preferDedupe: this[_preferDedupe],
legacyBundling: this[_legacyBundling],
strictPeerDeps: this[_strictPeerDeps],
legacyPeerDeps: this.legacyPeerDeps,
globalStyle: this[_globalStyle],
}))
const promises = []
for (const pd of placeDeps) {
// placing a dep is actually a tree of placing the dep itself
// and all of its peer group that aren't already met by the tree
depth({
tree: pd,
getChildren: pd => pd.children,
visit: pd => {
const { placed, edge, canPlace: cpd } = pd
// if we didn't place anything, nothing to do here
if (!placed) {
return
}
// we placed something, that means we changed the tree
if (placed.errors.length) {
this[_loadFailures].add(placed)
}
this[_mutateTree] = true
if (cpd.canPlaceSelf === OK) {
for (const edgeIn of placed.edgesIn) {
if (edgeIn === edge) {
continue
}
const { from, valid, peerConflicted } = edgeIn
if (!peerConflicted && !valid && !this[_depsSeen].has(from)) {
this.addTracker('idealTree', from.name, from.location)
this[_depsQueue].push(edgeIn.from)
}
}
} else {
/* istanbul ignore else - should be only OK or REPLACE here */
if (cpd.canPlaceSelf === REPLACE) {
// this may also create some invalid edges, for example if we're
// intentionally causing something to get nested which was
// previously placed in this location.
for (const edgeIn of placed.edgesIn) {