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node_modules/graphql/validation/rules/LoneSchemaDefinition.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.schemaDefinitionNotAloneMessage = schemaDefinitionNotAloneMessage;
+exports.canNotDefineSchemaWithinExtensionMessage = canNotDefineSchemaWithinExtensionMessage;
+exports.LoneSchemaDefinition = LoneSchemaDefinition;
+
+var _GraphQLError = require("../../error/GraphQLError");
+
+function schemaDefinitionNotAloneMessage() {
+  return 'Must provide only one schema definition.';
+}
+
+function canNotDefineSchemaWithinExtensionMessage() {
+  return 'Cannot define a new schema within a schema extension.';
+}
+/**
+ * Lone Schema definition
+ *
+ * A GraphQL document is only valid if it contains only one schema definition.
+ */
+
+
+function LoneSchemaDefinition(context) {
+  var oldSchema = context.getSchema();
+  var alreadyDefined = oldSchema && (oldSchema.astNode || oldSchema.getQueryType() || oldSchema.getMutationType() || oldSchema.getSubscriptionType());
+  var schemaDefinitionsCount = 0;
+  return {
+    SchemaDefinition: function SchemaDefinition(node) {
+      if (alreadyDefined) {
+        context.reportError(new _GraphQLError.GraphQLError(canNotDefineSchemaWithinExtensionMessage(), node));
+        return;
+      }
+
+      if (schemaDefinitionsCount > 0) {
+        context.reportError(new _GraphQLError.GraphQLError(schemaDefinitionNotAloneMessage(), node));
+      }
+
+      ++schemaDefinitionsCount;
+    }
+  };
+}