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website/node_modules/npm/lib/install/exists.js

@@ -0,0 +1,27 @@
+'use strict'
+var fs = require('fs')
+var inflight = require('inflight')
+var accessError = require('./access-error.js')
+var isFsAccessAvailable = require('./is-fs-access-available.js')
+
+if (isFsAccessAvailable) {
+  module.exports = fsAccessImplementation
+} else {
+  module.exports = fsStatImplementation
+}
+
+// exposed only for testing purposes
+module.exports.fsAccessImplementation = fsAccessImplementation
+module.exports.fsStatImplementation = fsStatImplementation
+
+function fsAccessImplementation (dir, done) {
+  done = inflight('exists:' + dir, done)
+  if (!done) return
+  fs.access(dir, fs.F_OK, done)
+}
+
+function fsStatImplementation (dir, done) {
+  done = inflight('exists:' + dir, done)
+  if (!done) return
+  fs.stat(dir, function (er) { done(accessError(dir, er)) })
+}