| /** @category Validation Rules */ |
| import type { ASTVisitor } from '../../language/visitor'; |
| import type { ValidationContext } from '../ValidationContext'; |
| /** |
| * Fragments on composite type |
| * |
| * Fragments use a type condition to determine if they apply, since fragments |
| * can only be spread into a composite type (object, interface, or union), the |
| * type condition must also be a composite type. |
| * |
| * See https://spec.graphql.org/draft/#sec-Fragments-On-Composite-Types |
| * @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 { FragmentsOnCompositeTypesRule } from 'graphql/validation'; |
| * |
| * const schema = buildSchema(` |
| * type Query { |
| * name: String |
| * } |
| * `); |
| * |
| * const invalidDocument = parse(` |
| * fragment Bad on String { length } |
| * `); |
| * const invalidErrors = validate(schema, invalidDocument, [FragmentsOnCompositeTypesRule]); |
| * |
| * invalidErrors.length; // => 1 |
| * |
| * const validDocument = parse(` |
| * fragment Good on Query { name } |
| * `); |
| * const validErrors = validate(schema, validDocument, [FragmentsOnCompositeTypesRule]); |
| * |
| * validErrors; // => [] |
| * ``` |
| */ |
| export declare function FragmentsOnCompositeTypesRule( |
| context: ValidationContext, |
| ): ASTVisitor; |