| import { inspect } from '../../jsutils/inspect.mjs'; |
| import { GraphQLError } from '../../error/GraphQLError.mjs'; |
| import { getNamedType, isLeafType } from '../../type/definition.mjs'; |
| |
| /** |
| * Scalar leafs |
| * |
| * A GraphQL document is valid only if all leaf fields (fields without |
| * sub selections) are of scalar or enum types. |
| */ |
| export function ScalarLeafsRule(context) { |
| return { |
| Field(node) { |
| const type = context.getType(); |
| const selectionSet = node.selectionSet; |
| |
| if (type) { |
| if (isLeafType(getNamedType(type))) { |
| if (selectionSet) { |
| const fieldName = node.name.value; |
| const typeStr = inspect(type); |
| context.reportError( |
| new GraphQLError( |
| `Field "${fieldName}" must not have a selection since type "${typeStr}" has no subfields.`, |
| { |
| nodes: selectionSet, |
| }, |
| ), |
| ); |
| } |
| } else if (!selectionSet) { |
| const fieldName = node.name.value; |
| const typeStr = inspect(type); |
| context.reportError( |
| new GraphQLError( |
| `Field "${fieldName}" of type "${typeStr}" must have a selection of subfields. Did you mean "${fieldName} { ... }"?`, |
| { |
| nodes: node, |
| }, |
| ), |
| ); |
| } |
| } |
| }, |
| }; |
| } |