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// The arborist manages three trees:
// - actual
// - virtual
// - ideal
//
// The actual tree is what's present on disk in the node_modules tree
// and elsewhere that links may extend.
//
// The virtual tree is loaded from metadata (package.json and lock files).
//
// The ideal tree is what we WANT that actual tree to become. This starts
// with the virtual tree, and then applies the options requesting
// add/remove/update actions.
//
// To reify a tree, we calculate a diff between the ideal and actual trees,
// and then turn the actual tree into the ideal tree by taking the actions
// required. At the end of the reification process, the actualTree is
// updated to reflect the changes.
//
// Each tree has an Inventory at the root. Shrinkwrap is tracked by Arborist
// instance. It always refers to the actual tree, but is updated (and written
// to disk) on reification.
// Each of the mixin "classes" adds functionality, but are not dependent on
// constructor call order. So, we just load them in an array, and build up
// the base class, so that the overall voltron class is easier to test and
// cover, and separation of concerns can be maintained.
const Auditor = require('./audit.js')
const {resolve} = require('path')
const {homedir} = require('os')
const mixins = [
require('../tracker.js'),
require('./pruner.js'),
require('./deduper.js'),
require('./audit.js'),
require('./build-ideal-tree.js'),
require('./load-actual.js'),
require('./load-virtual.js'),
require('./rebuild.js'),
require('./reify.js'),
]
const Base = mixins.reduce((a, b) => b(a), require('events'))
class Arborist extends Base {
constructor (options = {}) {
process.emit('time', 'arborist:ctor')
super(options)
this.options = {
nodeVersion: process.version,
...options,
path: options.path || '.',
cache: options.cache || `${homedir()}/.npm/_cacache`,
}
this.cache = resolve(this.options.cache)
this.path = resolve(this.options.path)
process.emit('timeEnd', 'arborist:ctor')
}
}
module.exports = Arborist
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