1 files changed, 44 insertions, 0 deletions
diff --git a/node_modules/inflight/inflight.js b/node_modules/inflight/inflight.js
new file mode 100644
index 000000000..8bc96cbd3
--- /dev/null
+++ b/node_modules/inflight/inflight.js
@@ -0,0 +1,44 @@
+var wrappy = require('wrappy')
+var reqs = Object.create(null)
+var once = require('once')
+
+module.exports = wrappy(inflight)
+
+function inflight (key, cb) {
+  if (reqs[key]) {
+    reqs[key].push(cb)
+    return null
+  } else {
+    reqs[key] = [cb]
+    return makeres(key)
+  }
+}
+
+function makeres (key) {
+  return once(function RES () {
+    var cbs = reqs[key]
+    var len = cbs.length
+    var args = slice(arguments)
+    for (var i = 0; i < len; i++) {
+      cbs[i].apply(null, args)
+    }
+    if (cbs.length > len) {
+      // added more in the interim.
+      // de-zalgo, just in case, but don't call again.
+      cbs.splice(0, len)
+      process.nextTick(function () {
+        RES.apply(null, args)
+      })
+    } else {
+      delete reqs[key]
+    }
+  })
+}
+
+function slice (args) {
+  var length = args.length
+  var array = []
+
+  for (var i = 0; i < length; i++) array[i] = args[i]
+  return array
+}