a

backend/node_modules/mquery/lib/collection/collection.js

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+'use strict';
+
+/**
+ * methods a collection must implement
+ */
+
+const methods = [
+  'find',
+  'findOne',
+  'updateMany',
+  'updateOne',
+  'replaceOne',
+  'countDocuments',
+  'estimatedDocumentCount',
+  'distinct',
+  'findOneAndDelete',
+  'findOneAndReplace',
+  'findOneAndUpdate',
+  'aggregate',
+  'findCursor',
+  'deleteOne',
+  'deleteMany'
+];
+
+/**
+ * Collection base class from which implementations inherit
+ */
+
+function Collection() {}
+
+for (let i = 0, len = methods.length; i < len; ++i) {
+  const method = methods[i];
+  Collection.prototype[method] = notImplemented(method);
+}
+
+module.exports = exports = Collection;
+Collection.methods = methods;
+
+/**
+ * creates a function which throws an implementation error
+ */
+
+function notImplemented(method) {
+  return function() {
+    throw new Error('collection.' + method + ' not implemented');
+  };
+}