1 files changed, 54 insertions, 0 deletions
diff --git a/deps/node/deps/npm/node_modules/libnpx/get-prefix.js b/deps/node/deps/npm/node_modules/libnpx/get-prefix.js
new file mode 100644
index 00000000..3fef7f7e
--- /dev/null
+++ b/deps/node/deps/npm/node_modules/libnpx/get-prefix.js
@@ -0,0 +1,54 @@
+'use strict'
+
+const promisify = require('./util.js').promisify
+
+const path = require('path')
+const statAsync = promisify(require('fs').stat)
+
+module.exports = getPrefix
+function getPrefix (root) {
+  const original = root = path.resolve(root)
+  while (path.basename(root) === 'node_modules') {
+    root = path.dirname(root)
+  }
+  if (original !== root) {
+    return Promise.resolve(root)
+  } else {
+    return Promise.resolve(getPrefixFromTree(root))
+  }
+}
+
+function getPrefixFromTree (current) {
+  if (isRootPath(current, process.platform)) {
+    return false
+  } else {
+    return Promise.all([
+      fileExists(path.join(current, 'package.json')),
+      fileExists(path.join(current, 'node_modules'))
+    ]).then(args => {
+      const hasPkg = args[0]
+      const hasModules = args[1]
+      if (hasPkg || hasModules) {
+        return current
+      } else {
+        return getPrefixFromTree(path.dirname(current))
+      }
+    })
+  }
+}
+
+module.exports._fileExists = fileExists
+function fileExists (f) {
+  return statAsync(f).catch(err => {
+    if (err.code !== 'ENOENT') {
+      throw err
+    }
+  })
+}
+
+module.exports._isRootPath = isRootPath
+function isRootPath (p, platform) {
+  return platform === 'win32'
+    ? p.match(/^[a-z]+:[/\\]?$/i)
+    : p === '/'
+}