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node_modules/graphql/validation/rules/SingleFieldSubscriptions.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.singleFieldOnlyMessage = singleFieldOnlyMessage;
+exports.SingleFieldSubscriptions = SingleFieldSubscriptions;
+
+var _GraphQLError = require("../../error/GraphQLError");
+
+function singleFieldOnlyMessage(name) {
+  return name ? "Subscription \"".concat(name, "\" must select only one top level field.") : 'Anonymous Subscription must select only one top level field.';
+}
+/**
+ * Subscriptions must only include one field.
+ *
+ * A GraphQL subscription is valid only if it contains a single root field.
+ */
+
+
+function SingleFieldSubscriptions(context) {
+  return {
+    OperationDefinition: function OperationDefinition(node) {
+      if (node.operation === 'subscription') {
+        if (node.selectionSet.selections.length !== 1) {
+          context.reportError(new _GraphQLError.GraphQLError(singleFieldOnlyMessage(node.name && node.name.value), node.selectionSet.selections.slice(1)));
+        }
+      }
+    }
+  };
+}