70 lines
1.9 KiB
Plaintext
70 lines
1.9 KiB
Plaintext
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict
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*/
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import inspect from '../../jsutils/inspect';
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import type { ValidationContext } from '../ValidationContext';
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import { GraphQLError } from '../../error/GraphQLError';
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import type { FieldNode } from '../../language/ast';
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import { getNamedType, isLeafType } from '../../type/definition';
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import type { ASTVisitor } from '../../language/visitor';
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export function noSubselectionAllowedMessage(
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fieldName: string,
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type: string,
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): string {
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return (
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`Field "${fieldName}" must not have a selection since ` +
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`type "${type}" has no subfields.`
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);
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}
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export function requiredSubselectionMessage(
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fieldName: string,
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type: string,
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): string {
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return (
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`Field "${fieldName}" of type "${type}" must have a ` +
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`selection of subfields. Did you mean "${fieldName} { ... }"?`
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);
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}
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/**
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* Scalar leafs
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*
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* A GraphQL document is valid only if all leaf fields (fields without
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* sub selections) are of scalar or enum types.
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*/
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export function ScalarLeafs(context: ValidationContext): ASTVisitor {
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return {
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Field(node: FieldNode) {
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const type = context.getType();
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const selectionSet = node.selectionSet;
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if (type) {
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if (isLeafType(getNamedType(type))) {
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if (selectionSet) {
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context.reportError(
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new GraphQLError(
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noSubselectionAllowedMessage(node.name.value, inspect(type)),
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[selectionSet],
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),
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);
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}
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} else if (!selectionSet) {
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context.reportError(
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new GraphQLError(
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requiredSubselectionMessage(node.name.value, inspect(type)),
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[node],
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),
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);
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}
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}
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},
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};
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}
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