text: /**
   * Copyright (c) Facebook, Inc. and its affiliates.
   *
   * This source code is licensed under the MIT license found in the
   * LICENSE file in the root directory of this source tree.
   *
   * @flow strict
   */
  
  import type { ASTValidationContext } from '../ValidationContext';
  import { GraphQLError } from '../../error/GraphQLError';
  import { Kind } from '../../language/kinds';
  import { isExecutableDefinitionNode } from '../../language/predicates';
  import type { ASTVisitor } from '../../language/visitor';
  
  export function nonExecutableDefinitionMessage(defName: string): string {
    return `The ${defName} definition is not executable.`;
  }
  
  /**
   * Executable definitions
   *
   * A GraphQL document is only valid for execution if all definitions are either
   * operation or fragment definitions.
   */
  export function ExecutableDefinitions(
    context: ASTValidationContext,
  ): ASTVisitor {
    return {
      Document(node) {
        for (const definition of node.definitions) {
          if (!isExecutableDefinitionNode(definition)) {
            context.reportError(
              new GraphQLError(
                nonExecutableDefinitionMessage(
                  definition.kind === Kind.SCHEMA_DEFINITION ||
                    definition.kind === Kind.SCHEMA_EXTENSION
                    ? 'schema'
                    : definition.name.value,
                ),
                definition,
              ),
            );
          }
        }
        return false;
      },
    };
  }
  