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authorMinteck <contact@minteck.org>2023-01-10 14:54:04 +0100
committerMinteck <contact@minteck.org>2023-01-10 14:54:04 +0100
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Update - This is an automated commit
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+// @flow strict
+import inspect from '../../jsutils/inspect';
+
+import { GraphQLError } from '../../error/GraphQLError';
+
+import type { FieldNode } from '../../language/ast';
+import type { ASTVisitor } from '../../language/visitor';
+
+import { getNamedType, isLeafType } from '../../type/definition';
+
+import type { ValidationContext } from '../ValidationContext';
+
+/**
+ * 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: ValidationContext): ASTVisitor {
+ return {
+ Field(node: FieldNode) {
+ 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.`,
+ 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} { ... }"?`,
+ node,
+ ),
+ );
+ }
+ }
+ },
+ };
+}