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website/node_modules/npm/lib/config/load-prefix.js

@@ -0,0 +1,51 @@
+module.exports = loadPrefix
+
+var findPrefix = require('find-npm-prefix')
+var path = require('path')
+
+function loadPrefix (cb) {
+  var cli = this.list[0]
+
+  Object.defineProperty(this, 'prefix',
+    {
+      set: function (prefix) {
+        var g = this.get('global')
+        this[g ? 'globalPrefix' : 'localPrefix'] = prefix
+      }.bind(this),
+      get: function () {
+        var g = this.get('global')
+        return g ? this.globalPrefix : this.localPrefix
+      }.bind(this),
+      enumerable: true
+    })
+
+  Object.defineProperty(this, 'globalPrefix',
+    {
+      set: function (prefix) {
+        this.set('prefix', prefix)
+      }.bind(this),
+      get: function () {
+        return path.resolve(this.get('prefix'))
+      }.bind(this),
+      enumerable: true
+    })
+
+  var p
+  Object.defineProperty(this, 'localPrefix',
+    { set: function (prefix) { p = prefix },
+      get: function () { return p },
+      enumerable: true })
+
+  // try to guess at a good node_modules location.
+  // If we are *explicitly* given a prefix on the cli, then
+  // always use that.  otherwise, infer local prefix from cwd.
+  if (Object.prototype.hasOwnProperty.call(cli, 'prefix')) {
+    p = path.resolve(cli.prefix)
+    process.nextTick(cb)
+  } else {
+    findPrefix(process.cwd()).then((found) => {
+      p = found
+      cb()
+    }, cb)
+  }
+}