@graphql-mesh/transform-filter-schema/esm/healSchemaRootAst.js

import { GraphQLSchema as GraphQLSchemaClass } from 'graphql';
/**
 * mapSchema can leave schema.astNode.operationTypes pointing at root types that
 * were removed (e.g. empty Mutation after filterSchema). Heal those AST nodes so
 * later SDL round-trips (mergeSchemas / printSchemaWithDirectives) stay valid.
 */
export function healSchemaRootAst(schema) {
    const config = schema.toConfig();
    const presentRootNames = new Set([config.query?.name, config.mutation?.name, config.subscription?.name].filter((name) => Boolean(name)));
    const filterOperationTypes = (node) => {
        if (!node?.operationTypes) {
            return node ?? undefined;
        }
        const operationTypes = node.operationTypes.filter(op => presentRootNames.has(op.type.name.value));
        if (operationTypes.length === node.operationTypes.length) {
            return node;
        }
        return {
            ...node,
            operationTypes,
        };
    };
    const astNode = filterOperationTypes(config.astNode);
    const extensionASTNodes = (config.extensionASTNodes ?? []).map(node => filterOperationTypes(node));
    return new GraphQLSchemaClass({
        ...config,
        astNode,
        extensionASTNodes,
    });
}