github-pages-deploy-action/node_modules/graphql/validation/rules/LoneSchemaDefinitionRule.mjs
2020-03-06 22:45:40 -05:00

29 lines
1.2 KiB
JavaScript

import { GraphQLError } from "../../error/GraphQLError.mjs";
/**
* Lone Schema definition
*
* A GraphQL document is only valid if it contains only one schema definition.
*/
export function LoneSchemaDefinitionRule(context) {
var _ref, _ref2, _ref3;
var oldSchema = context.getSchema();
var alreadyDefined = (_ref = (_ref2 = (_ref3 = oldSchema === null || oldSchema === void 0 ? void 0 : oldSchema.astNode) !== null && _ref3 !== void 0 ? _ref3 : oldSchema === null || oldSchema === void 0 ? void 0 : oldSchema.getQueryType()) !== null && _ref2 !== void 0 ? _ref2 : oldSchema === null || oldSchema === void 0 ? void 0 : oldSchema.getMutationType()) !== null && _ref !== void 0 ? _ref : oldSchema === null || oldSchema === void 0 ? void 0 : oldSchema.getSubscriptionType();
var schemaDefinitionsCount = 0;
return {
SchemaDefinition: function SchemaDefinition(node) {
if (alreadyDefined) {
context.reportError(new GraphQLError('Cannot define a new schema within a schema extension.', node));
return;
}
if (schemaDefinitionsCount > 0) {
context.reportError(new GraphQLError('Must provide only one schema definition.', node));
}
++schemaDefinitionsCount;
}
};
}