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website/node_modules/npm/lib/prune.js

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+// prune extraneous packages.
+
+module.exports = prune
+module.exports.Pruner = Pruner
+
+prune.usage = 'npm prune [[<@scope>/]<pkg>...] [--production]'
+
+var npm = require('./npm.js')
+var log = require('npmlog')
+var util = require('util')
+var moduleName = require('./utils/module-name.js')
+var Installer = require('./install.js').Installer
+var isExtraneous = require('./install/is-extraneous.js')
+var isOnlyDev = require('./install/is-only-dev.js')
+var removeDeps = require('./install/deps.js').removeDeps
+var loadExtraneous = require('./install/deps.js').loadExtraneous
+var chain = require('slide').chain
+var computeMetadata = require('./install/deps.js').computeMetadata
+
+prune.completion = require('./utils/completion/installed-deep.js')
+
+function prune (args, cb) {
+  var dryrun = !!npm.config.get('dry-run')
+  new Pruner('.', dryrun, args).run(cb)
+}
+
+function Pruner (where, dryrun, args) {
+  Installer.call(this, where, dryrun, args)
+  this.autoPrune = true
+}
+util.inherits(Pruner, Installer)
+
+Pruner.prototype.loadAllDepsIntoIdealTree = function (cb) {
+  log.silly('uninstall', 'loadAllDepsIntoIdealTree')
+
+  var cg = this.progress['loadIdealTree:loadAllDepsIntoIdealTree']
+  var steps = []
+
+  computeMetadata(this.idealTree)
+  var self = this
+  var excludeDev = npm.config.get('production') || /^prod(uction)?$/.test(npm.config.get('only'))
+  function shouldPrune (child) {
+    if (isExtraneous(child)) return true
+    if (!excludeDev) return false
+    return isOnlyDev(child)
+  }
+  function getModuleName (child) {
+    // wrapping because moduleName doesn't like extra args and we're called
+    // from map.
+    return moduleName(child)
+  }
+  function matchesArg (name) {
+    return self.args.length === 0 || self.args.indexOf(name) !== -1
+  }
+  function nameObj (name) {
+    return {name: name}
+  }
+  var toPrune = this.idealTree.children.filter(shouldPrune).map(getModuleName).filter(matchesArg).map(nameObj)
+
+  steps.push(
+    [removeDeps, toPrune, this.idealTree, null],
+    [loadExtraneous, this.idealTree, cg.newGroup('loadExtraneous')])
+  chain(steps, cb)
+}
+
+Pruner.prototype.runPreinstallTopLevelLifecycles = function (cb) { cb() }
+Pruner.prototype.runPostinstallTopLevelLifecycles = function (cb) { cb() }
+Pruner.prototype.saveToDependencies = function (cb) { cb() }