fix(merge): Don't merge/override arguments for repeatable directives

.changeset/cyan-ears-knock.md

@@ -0,0 +1,5 @@
+---
+'@graphql-tools/merge': patch
+---
+
+Don't merge/override arguments for repeatable directives

packages/merge/src/typedefs-mergers/directives.ts

@@ -6,6 +6,13 @@ function directiveAlreadyExists(directivesArr: ReadonlyArray<DirectiveNode>, oth
   return !!directivesArr.find(directive => directive.name.value === otherDirective.name.value);
 }
 
+function isRepeatableDirective(
+  directive: DirectiveNode,
+  directives?: Record<string, DirectiveDefinitionNode>
+): boolean {
+  return !!directives?.[directive.name.value]?.repeatable;
+}
+
 function nameAlreadyExists(name: NameNode, namesArr: ReadonlyArray<NameNode>): boolean {
   return namesArr.some(({ value }) => value === name.value);
 }
@@ -39,12 +46,15 @@ function mergeArguments(a1: readonly ArgumentNode[], a2: readonly ArgumentNode[]
   return result;
 }
 
-function deduplicateDirectives(directives: ReadonlyArray<DirectiveNode>): DirectiveNode[] {
+function deduplicateDirectives(
+  directives: ReadonlyArray<DirectiveNode>,
+  definitions?: Record<string, DirectiveDefinitionNode>
+): DirectiveNode[] {
   return directives
     .map((directive, i, all) => {
       const firstAt = all.findIndex(d => d.name.value === directive.name.value);
 
-      if (firstAt !== i) {
+      if (firstAt !== i && !isRepeatableDirective(directive, definitions)) {
         const dup = all[firstAt];
 
         (directive as any).arguments = mergeArguments(directive.arguments as any, dup.arguments as any);
@@ -59,15 +69,16 @@ function deduplicateDirectives(directives: ReadonlyArray<DirectiveNode>): Direct
 export function mergeDirectives(
   d1: ReadonlyArray<DirectiveNode> = [],
   d2: ReadonlyArray<DirectiveNode> = [],
-  config?: Config
+  config?: Config,
+  directives?: Record<string, DirectiveDefinitionNode>
 ): DirectiveNode[] {
   const reverseOrder: boolean | undefined = config && config.reverseDirectives;
   const asNext = reverseOrder ? d1 : d2;
   const asFirst = reverseOrder ? d2 : d1;
-  const result = deduplicateDirectives([...asNext]);
+  const result = deduplicateDirectives([...asNext], directives);
 
   for (const directive of asFirst) {
-    if (directiveAlreadyExists(result, directive)) {
+    if (directiveAlreadyExists(result, directive) && !isRepeatableDirective(directive, directives)) {
       const existingDirectiveIndex = result.findIndex(d => d.name.value === directive.name.value);
       const existingDirective = result[existingDirectiveIndex];
       (result[existingDirectiveIndex] as any).arguments = mergeArguments(

packages/merge/src/typedefs-mergers/enum-values.ts

@@ -1,12 +1,13 @@
-import { EnumValueDefinitionNode } from 'graphql';
+import { DirectiveDefinitionNode, EnumValueDefinitionNode } from 'graphql';
 import { mergeDirectives } from './directives.js';
 import { Config } from './merge-typedefs.js';
 import { compareNodes } from '@graphql-tools/utils';
 
 export function mergeEnumValues(
   first: ReadonlyArray<EnumValueDefinitionNode> | undefined,
   second: ReadonlyArray<EnumValueDefinitionNode> | undefined,
-  config?: Config
+  config?: Config,
+  directives?: Record<string, DirectiveDefinitionNode>
 ): EnumValueDefinitionNode[] {
   if (config?.consistentEnumMerge) {
     const reversed: Array<EnumValueDefinitionNode> = [];
@@ -28,7 +29,7 @@ export function mergeEnumValues(
       if (enumValueMap.has(enumValue)) {
         const firstValue: any = enumValueMap.get(enumValue);
         firstValue.description = secondValue.description || firstValue.description;
-        firstValue.directives = mergeDirectives(secondValue.directives, firstValue.directives);
+        firstValue.directives = mergeDirectives(secondValue.directives, firstValue.directives, directives);
       } else {
         enumValueMap.set(enumValue, secondValue);
       }

packages/merge/src/typedefs-mergers/enum.ts

@@ -1,12 +1,13 @@
-import { EnumTypeDefinitionNode, EnumTypeExtensionNode, Kind } from 'graphql';
+import { DirectiveDefinitionNode, EnumTypeDefinitionNode, EnumTypeExtensionNode, Kind } from 'graphql';
 import { mergeDirectives } from './directives.js';
 import { mergeEnumValues } from './enum-values.js';
 import { Config } from './merge-typedefs.js';
 
 export function mergeEnum(
   e1: EnumTypeDefinitionNode | EnumTypeExtensionNode,
   e2: EnumTypeDefinitionNode | EnumTypeExtensionNode,
-  config?: Config
+  config?: Config,
+  directives?: Record<string, DirectiveDefinitionNode>
 ): EnumTypeDefinitionNode | EnumTypeExtensionNode {
   if (e2) {
     return {
@@ -17,7 +18,7 @@ export function mergeEnum(
           ? 'EnumTypeDefinition'
           : 'EnumTypeExtension',
       loc: e1.loc,
-      directives: mergeDirectives(e1.directives, e2.directives, config),
+      directives: mergeDirectives(e1.directives, e2.directives, config, directives),
       values: mergeEnumValues(e1.values, e2.values, config),
     } as any;
   }

packages/merge/src/typedefs-mergers/fields.ts

@@ -1,5 +1,5 @@
 import { Config } from './merge-typedefs.js';
-import { FieldDefinitionNode, InputValueDefinitionNode, TypeNode, NameNode } from 'graphql';
+import { FieldDefinitionNode, InputValueDefinitionNode, TypeNode, NameNode, DirectiveDefinitionNode } from 'graphql';
 import { extractType, isWrappingTypeNode, isListTypeNode, isNonNullTypeNode, printTypeNode } from './utils.js';
 import { mergeDirectives } from './directives.js';
 import { compareNodes } from '@graphql-tools/utils';
@@ -25,7 +25,8 @@ export function mergeFields<T extends FieldDefNode>(
   type: { name: NameNode },
   f1: ReadonlyArray<T> | undefined,
   f2: ReadonlyArray<T> | undefined,
-  config?: Config
+  config?: Config,
+  directives?: Record<string, DirectiveDefinitionNode>
 ): T[] {
   const result: T[] = [];
   if (f2 != null) {
@@ -41,7 +42,7 @@ export function mergeFields<T extends FieldDefNode>(
           preventConflicts(type, existing, field, config?.throwOnConflict);
 
         newField.arguments = mergeArguments(field['arguments'] || [], existing['arguments'] || [], config);
-        newField.directives = mergeDirectives(field.directives, existing.directives, config);
+        newField.directives = mergeDirectives(field.directives, existing.directives, config, directives);
         newField.description = field.description || existing.description;
         result[existingIndex] = newField;
       } else {

packages/merge/src/typedefs-mergers/input-type.ts

@@ -1,12 +1,19 @@
 import { Config } from './merge-typedefs.js';
-import { InputObjectTypeDefinitionNode, InputValueDefinitionNode, InputObjectTypeExtensionNode, Kind } from 'graphql';
+import {
+  InputObjectTypeDefinitionNode,
+  InputValueDefinitionNode,
+  InputObjectTypeExtensionNode,
+  Kind,
+  DirectiveDefinitionNode,
+} from 'graphql';
 import { mergeFields } from './fields.js';
 import { mergeDirectives } from './directives.js';
 
 export function mergeInputType(
   node: InputObjectTypeDefinitionNode | InputObjectTypeExtensionNode,
   existingNode: InputObjectTypeDefinitionNode | InputObjectTypeExtensionNode,
-  config?: Config
+  config?: Config,
+  directives?: Record<string, DirectiveDefinitionNode>
 ): InputObjectTypeDefinitionNode | InputObjectTypeExtensionNode {
   if (existingNode) {
     try {
@@ -21,7 +28,7 @@ export function mergeInputType(
             : 'InputObjectTypeExtension',
         loc: node.loc,
         fields: mergeFields<InputValueDefinitionNode>(node, node.fields, existingNode.fields, config),
-        directives: mergeDirectives(node.directives, existingNode.directives, config),
+        directives: mergeDirectives(node.directives, existingNode.directives, config, directives),
       } as any;
     } catch (e: any) {
       throw new Error(`Unable to merge GraphQL input type "${node.name.value}": ${e.message}`);

packages/merge/src/typedefs-mergers/interface.ts

@@ -1,13 +1,14 @@
 import { Config } from './merge-typedefs.js';
-import { InterfaceTypeDefinitionNode, InterfaceTypeExtensionNode, Kind } from 'graphql';
+import { DirectiveDefinitionNode, InterfaceTypeDefinitionNode, InterfaceTypeExtensionNode, Kind } from 'graphql';
 import { mergeFields } from './fields.js';
 import { mergeDirectives } from './directives.js';
 import { mergeNamedTypeArray } from './merge-named-type-array.js';
 
 export function mergeInterface(
   node: InterfaceTypeDefinitionNode | InterfaceTypeExtensionNode,
   existingNode: InterfaceTypeDefinitionNode | InterfaceTypeExtensionNode,
-  config?: Config
+  config?: Config,
+  directives?: Record<string, DirectiveDefinitionNode>
 ): InterfaceTypeDefinitionNode | InterfaceTypeExtensionNode {
   if (existingNode) {
     try {
@@ -22,7 +23,7 @@ export function mergeInterface(
             : 'InterfaceTypeExtension',
         loc: node.loc,
         fields: mergeFields(node, node.fields, existingNode.fields, config),
-        directives: mergeDirectives(node.directives, existingNode.directives, config),
+        directives: mergeDirectives(node.directives, existingNode.directives, config, directives),
         interfaces: node['interfaces']
           ? mergeNamedTypeArray(node['interfaces'], existingNode['interfaces'], config)
           : undefined,

packages/merge/src/typedefs-mergers/merge-nodes.ts

@@ -1,5 +1,5 @@
 import { Config } from './merge-typedefs.js';
-import { DefinitionNode, Kind, SchemaDefinitionNode, SchemaExtensionNode } from 'graphql';
+import { DefinitionNode, DirectiveDefinitionNode, Kind, SchemaDefinitionNode, SchemaExtensionNode } from 'graphql';
 import { mergeType } from './type.js';
 import { mergeEnum } from './enum.js';
 import { mergeScalar } from './scalar.js';
@@ -20,8 +20,12 @@ export function isNamedDefinitionNode(definitionNode: DefinitionNode): definitio
   return 'name' in definitionNode;
 }
 
-export function mergeGraphQLNodes(nodes: ReadonlyArray<DefinitionNode>, config?: Config): MergedResultMap {
-  const mergedResultMap = {} as MergedResultMap;
+export function mergeGraphQLNodes(
+  nodes: ReadonlyArray<DefinitionNode>,
+  config?: Config,
+  directives: Record<string, DirectiveDefinitionNode> = {}
+): MergedResultMap {
+  const mergedResultMap = directives as MergedResultMap;
   for (const nodeDefinition of nodes) {
     if (isNamedDefinitionNode(nodeDefinition)) {
       const name = nodeDefinition.name?.value;
@@ -39,27 +43,27 @@ export function mergeGraphQLNodes(nodes: ReadonlyArray<DefinitionNode>, config?:
         switch (nodeDefinition.kind) {
           case Kind.OBJECT_TYPE_DEFINITION:
           case Kind.OBJECT_TYPE_EXTENSION:
-            mergedResultMap[name] = mergeType(nodeDefinition, mergedResultMap[name] as any, config);
+            mergedResultMap[name] = mergeType(nodeDefinition, mergedResultMap[name] as any, config, directives);
             break;
           case Kind.ENUM_TYPE_DEFINITION:
           case Kind.ENUM_TYPE_EXTENSION:
-            mergedResultMap[name] = mergeEnum(nodeDefinition, mergedResultMap[name] as any, config);
+            mergedResultMap[name] = mergeEnum(nodeDefinition, mergedResultMap[name] as any, config, directives);
             break;
           case Kind.UNION_TYPE_DEFINITION:
           case Kind.UNION_TYPE_EXTENSION:
-            mergedResultMap[name] = mergeUnion(nodeDefinition, mergedResultMap[name] as any, config);
+            mergedResultMap[name] = mergeUnion(nodeDefinition, mergedResultMap[name] as any, config, directives);
             break;
           case Kind.SCALAR_TYPE_DEFINITION:
           case Kind.SCALAR_TYPE_EXTENSION:
-            mergedResultMap[name] = mergeScalar(nodeDefinition, mergedResultMap[name] as any, config);
+            mergedResultMap[name] = mergeScalar(nodeDefinition, mergedResultMap[name] as any, config, directives);
             break;
           case Kind.INPUT_OBJECT_TYPE_DEFINITION:
           case Kind.INPUT_OBJECT_TYPE_EXTENSION:
-            mergedResultMap[name] = mergeInputType(nodeDefinition, mergedResultMap[name] as any, config);
+            mergedResultMap[name] = mergeInputType(nodeDefinition, mergedResultMap[name] as any, config, directives);
             break;
           case Kind.INTERFACE_TYPE_DEFINITION:
           case Kind.INTERFACE_TYPE_EXTENSION:
-            mergedResultMap[name] = mergeInterface(nodeDefinition, mergedResultMap[name] as any, config);
+            mergedResultMap[name] = mergeInterface(nodeDefinition, mergedResultMap[name] as any, config, directives);
             break;
           case Kind.DIRECTIVE_DEFINITION:
             mergedResultMap[name] = mergeDirective(nodeDefinition, mergedResultMap[name] as any);

packages/merge/src/typedefs-mergers/merge-typedefs.ts

@@ -8,9 +8,10 @@ import {
   OperationTypeNode,
   isDefinitionNode,
   ParseOptions,
+  DirectiveDefinitionNode,
 } from 'graphql';
 import { CompareFn, defaultStringComparator, isSourceTypes, isStringTypes } from './utils.js';
-import { MergedResultMap, mergeGraphQLNodes, schemaDefSymbol } from './merge-nodes.js';
+import { mergeGraphQLNodes, schemaDefSymbol } from './merge-nodes.js';
 import {
   getDocumentNodeFromSchema,
   GetDocumentNodeFromSchemaOptions,
@@ -135,40 +136,65 @@ export function mergeTypeDefs(typeSource: TypeSource, config?: Partial<Config>):
 function visitTypeSources(
   typeSource: TypeSource,
   options: ParseOptions & GetDocumentNodeFromSchemaOptions,
+  allDirectives: DirectiveDefinitionNode[] = [],
   allNodes: DefinitionNode[] = [],
   visitedTypeSources = new Set<TypeSource>()
 ) {
   if (typeSource && !visitedTypeSources.has(typeSource)) {
     visitedTypeSources.add(typeSource);
     if (typeof typeSource === 'function') {
-      visitTypeSources(typeSource(), options, allNodes, visitedTypeSources);
+      visitTypeSources(typeSource(), options, allDirectives, allNodes, visitedTypeSources);
     } else if (Array.isArray(typeSource)) {
       for (const type of typeSource) {
-        visitTypeSources(type, options, allNodes, visitedTypeSources);
+        visitTypeSources(type, options, allDirectives, allNodes, visitedTypeSources);
       }
     } else if (isSchema(typeSource)) {
       const documentNode = getDocumentNodeFromSchema(typeSource, options);
-      visitTypeSources(documentNode.definitions as DefinitionNode[], options, allNodes, visitedTypeSources);
+      visitTypeSources(
+        documentNode.definitions as DefinitionNode[],
+        options,
+        allDirectives,
+        allNodes,
+        visitedTypeSources
+      );
     } else if (isStringTypes(typeSource) || isSourceTypes(typeSource)) {
       const documentNode = parse(typeSource, options);
-      visitTypeSources(documentNode.definitions as DefinitionNode[], options, allNodes, visitedTypeSources);
+      visitTypeSources(
+        documentNode.definitions as DefinitionNode[],
+        options,
+        allDirectives,
+        allNodes,
+        visitedTypeSources
+      );
     } else if (typeof typeSource === 'object' && isDefinitionNode(typeSource)) {
-      allNodes.push(typeSource);
+      if (typeSource.kind === Kind.DIRECTIVE_DEFINITION) {
+        allDirectives.push(typeSource);
+      } else {
+        allNodes.push(typeSource);
+      }
     } else if (isDocumentNode(typeSource)) {
-      visitTypeSources(typeSource.definitions as DefinitionNode[], options, allNodes, visitedTypeSources);
+      visitTypeSources(
+        typeSource.definitions as DefinitionNode[],
+        options,
+        allDirectives,
+        allNodes,
+        visitedTypeSources
+      );
     } else {
       throw new Error(`typeDefs must contain only strings, documents, schemas, or functions, got ${typeof typeSource}`);
     }
   }
-  return allNodes;
+  return { allDirectives, allNodes };
 }
 
 export function mergeGraphQLTypes(typeSource: TypeSource, config: Config): DefinitionNode[] {
   resetComments();
 
-  const allNodes = visitTypeSources(typeSource, config);
+  const { allDirectives, allNodes } = visitTypeSources(typeSource, config);
+
+  const mergedDirectives = mergeGraphQLNodes(allDirectives, config) as Record<string, DirectiveDefinitionNode>;
 
-  const mergedNodes: MergedResultMap = mergeGraphQLNodes(allNodes, config);
+  const mergedNodes = mergeGraphQLNodes(allNodes, config, mergedDirectives);
 
   if (config?.useSchemaDefinition) {
     // XXX: right now we don't handle multiple schema definitions

packages/merge/src/typedefs-mergers/scalar.ts

@@ -1,11 +1,12 @@
-import { Kind, ScalarTypeDefinitionNode, ScalarTypeExtensionNode } from 'graphql';
+import { DirectiveDefinitionNode, Kind, ScalarTypeDefinitionNode, ScalarTypeExtensionNode } from 'graphql';
 import { mergeDirectives } from './directives.js';
 import { Config } from './merge-typedefs.js';
 
 export function mergeScalar(
   node: ScalarTypeDefinitionNode | ScalarTypeExtensionNode,
   existingNode: ScalarTypeDefinitionNode | ScalarTypeExtensionNode,
-  config?: Config
+  config?: Config,
+  directives?: Record<string, DirectiveDefinitionNode>
 ): ScalarTypeDefinitionNode | ScalarTypeExtensionNode {
   if (existingNode) {
     return {
@@ -18,7 +19,7 @@ export function mergeScalar(
           ? 'ScalarTypeDefinition'
           : 'ScalarTypeExtension',
       loc: node.loc,
-      directives: mergeDirectives(node.directives, existingNode.directives, config),
+      directives: mergeDirectives(node.directives, existingNode.directives, config, directives),
     } as any;
   }
 

packages/merge/src/typedefs-mergers/schema-def.ts

@@ -1,4 +1,10 @@
-import { Kind, OperationTypeDefinitionNode, SchemaDefinitionNode, SchemaExtensionNode } from 'graphql';
+import {
+  DirectiveDefinitionNode,
+  Kind,
+  OperationTypeDefinitionNode,
+  SchemaDefinitionNode,
+  SchemaExtensionNode,
+} from 'graphql';
 import { mergeDirectives } from './directives.js';
 import { Config } from './merge-typedefs.js';
 
@@ -26,7 +32,8 @@ function mergeOperationTypes(
 export function mergeSchemaDefs(
   node: SchemaDefinitionNode | SchemaExtensionNode,
   existingNode: SchemaDefinitionNode | SchemaExtensionNode,
-  config?: Config
+  config?: Config,
+  directives?: Record<string, DirectiveDefinitionNode>
 ): SchemaDefinitionNode | SchemaExtensionNode {
   if (existingNode) {
     return {
@@ -35,7 +42,7 @@ export function mergeSchemaDefs(
           ? Kind.SCHEMA_DEFINITION
           : Kind.SCHEMA_EXTENSION,
       description: node['description'] || existingNode['description'],
-      directives: mergeDirectives(node.directives, existingNode.directives, config),
+      directives: mergeDirectives(node.directives, existingNode.directives, config, directives),
       operationTypes: mergeOperationTypes(node.operationTypes, existingNode.operationTypes),
     } as any;
   }