From de98e0b232509d5f40c135d540a70e415272ff85 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Wed, 3 May 2017 15:35:00 +0200
Subject: node_modules

---
 node_modules/async/internal/onlyOnce.js | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 node_modules/async/internal/onlyOnce.js

(limited to 'node_modules/async/internal/onlyOnce.js')

diff --git a/node_modules/async/internal/onlyOnce.js b/node_modules/async/internal/onlyOnce.js
new file mode 100644
index 000000000..f2e3001dc
--- /dev/null
+++ b/node_modules/async/internal/onlyOnce.js
@@ -0,0 +1,15 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = onlyOnce;
+function onlyOnce(fn) {
+    return function () {
+        if (fn === null) throw new Error("Callback was already called.");
+        var callFn = fn;
+        fn = null;
+        callFn.apply(this, arguments);
+    };
+}
+module.exports = exports["default"];
\ No newline at end of file
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