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node_modules/mongoose/lib/helpers/query/wrapThunk.js

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+'use strict';
+
+/*!
+ * A query thunk is the function responsible for sending the query to MongoDB,
+ * like `Query#_findOne()` or `Query#_execUpdate()`. The `Query#exec()` function
+ * calls a thunk. The term "thunk" here is the traditional Node.js definition:
+ * a function that takes exactly 1 parameter, a callback.
+ *
+ * This function defines common behavior for all query thunks.
+ */
+
+module.exports = function wrapThunk(fn) {
+  return function _wrappedThunk(cb) {
+    ++this._executionCount;
+
+    fn.call(this, cb);
+  };
+};