react app

react-app/node_modules/lodash/internal/setData.js

@@ -0,0 +1,41 @@
+var baseSetData = require('./baseSetData'),
+    now = require('../date/now');
+
+/** Used to detect when a function becomes hot. */
+var HOT_COUNT = 150,
+    HOT_SPAN = 16;
+
+/**
+ * Sets metadata for `func`.
+ *
+ * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
+ * period of time, it will trip its breaker and transition to an identity function
+ * to avoid garbage collection pauses in V8. See [V8 issue 2070](https://code.google.com/p/v8/issues/detail?id=2070)
+ * for more details.
+ *
+ * @private
+ * @param {Function} func The function to associate metadata with.
+ * @param {*} data The metadata.
+ * @returns {Function} Returns `func`.
+ */
+var setData = (function() {
+  var count = 0,
+      lastCalled = 0;
+
+  return function(key, value) {
+    var stamp = now(),
+        remaining = HOT_SPAN - (stamp - lastCalled);
+
+    lastCalled = stamp;
+    if (remaining > 0) {
+      if (++count >= HOT_COUNT) {
+        return key;
+      }
+    } else {
+      count = 0;
+    }
+    return baseSetData(key, value);
+  };
+}());
+
+module.exports = setData;