47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
import { inspect } from '../../jsutils/inspect.mjs';
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import { GraphQLError } from '../../error/GraphQLError.mjs';
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import { getNamedType, isLeafType } from '../../type/definition.mjs';
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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 ScalarLeafsRule(context) {
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return {
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Field(node) {
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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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const fieldName = node.name.value;
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const typeStr = inspect(type);
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context.reportError(
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new GraphQLError(
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`Field "${fieldName}" must not have a selection since type "${typeStr}" has no subfields.`,
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{
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nodes: selectionSet,
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},
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),
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);
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}
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} else if (!selectionSet) {
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const fieldName = node.name.value;
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const typeStr = inspect(type);
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context.reportError(
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new GraphQLError(
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`Field "${fieldName}" of type "${typeStr}" must have a selection of subfields. Did you mean "${fieldName} { ... }"?`,
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{
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nodes: 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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}
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