| /** @category Validation Rules */ |
| import type { ASTVisitor } from '../../language/visitor'; |
| import type { ASTValidationContext } from '../ValidationContext'; |
| /** |
| * No fragment cycles |
| * |
| * The graph of fragment spreads must not form any cycles including spreading itself. |
| * Otherwise an operation could infinitely spread or infinitely execute on cycles in the underlying data. |
| * |
| * See https://spec.graphql.org/draft/#sec-Fragment-spreads-must-not-form-cycles |
| * @param context - The validation context used while checking the document. |
| * @returns A visitor that reports validation errors for this rule. |
| * @example |
| * ```ts |
| * import { buildSchema, parse, validate } from 'graphql'; |
| * import { NoFragmentCyclesRule } from 'graphql/validation'; |
| * |
| * const schema = buildSchema(` |
| * type Query { |
| * name: String |
| * } |
| * `); |
| * |
| * const invalidDocument = parse(` |
| * fragment A on Query { ...B } fragment B on Query { ...A } query { ...A } |
| * `); |
| * const invalidErrors = validate(schema, invalidDocument, [NoFragmentCyclesRule]); |
| * |
| * invalidErrors.length; // => 1 |
| * |
| * const validDocument = parse(` |
| * fragment A on Query { name } query { ...A } |
| * `); |
| * const validErrors = validate(schema, validDocument, [NoFragmentCyclesRule]); |
| * |
| * validErrors; // => [] |
| * ``` |
| */ |
| export declare function NoFragmentCyclesRule( |
| context: ASTValidationContext, |
| ): ASTVisitor; |