do not modify Path interface

Author: yaacovCR

src/execution/IncrementalGraph.ts

@@ -73,15 +73,13 @@ class DeferredFragmentFactory {
     if (depth === 0) {
       return;
     }
+    const stack: Array<Path> = [];
     let currentPath = path;
-    invariant(currentPath !== undefined);
-    let currentDepth = currentPath.depth;
-    while (currentDepth > depth) {
+    while (currentPath !== undefined) {
+      stack.unshift(currentPath);
       currentPath = currentPath.prev;
-      invariant(currentPath !== undefined);
-      currentDepth = currentPath.depth;
     }
-    return currentPath;
+    return stack[depth - 1];
   }
 }
 

src/execution/__tests__/executor-test.ts

@@ -239,7 +239,7 @@ describe('Execute: Handles basic execution tasks', () => {
     const field = operation.selectionSet.selections[0];
     expect(resolvedInfo).to.deep.include({
       fieldNodes: [field],
-      path: { prev: undefined, key: 'result', typename: 'Test', depth: 1 },
+      path: { prev: undefined, key: 'result', typename: 'Test' },
       variableValues: { var: 'abc' },
     });
   });
@@ -291,15 +291,12 @@ describe('Execute: Handles basic execution tasks', () => {
     expect(path).to.deep.equal({
       key: 'l2',
       typename: 'SomeObject',
-      depth: 3,
       prev: {
         key: 0,
         typename: undefined,
-        depth: 2,
         prev: {
           key: 'l1',
           typename: 'SomeQuery',
-          depth: 1,
           prev: undefined,
         },
       },

src/execution/collectFields.ts

@@ -1,6 +1,8 @@
 import { AccumulatorMap } from '../jsutils/AccumulatorMap.js';
 import { invariant } from '../jsutils/invariant.js';
 import type { ObjMap } from '../jsutils/ObjMap.js';
+import type { Path } from '../jsutils/Path.js';
+import { pathToArray } from '../jsutils/Path.js';
 
 import type {
   FieldNode,
@@ -100,7 +102,7 @@ export function collectSubfields(
   operation: OperationDefinitionNode,
   returnType: GraphQLObjectType,
   fieldGroup: FieldGroup,
-  depth: number,
+  path: Path,
 ): GroupedFieldSet {
   const context: CollectFieldsContext = {
     schema,
@@ -119,8 +121,8 @@ export function collectSubfields(
         context,
         node.selectionSet,
         subGroupedFieldSet,
+        path,
         deferUsage,
-        depth,
       );
     }
   }
@@ -134,8 +136,8 @@ function collectFieldsImpl(
   groupedFieldSet: AccumulatorMap<string, FieldDetails> & {
     encounteredDefer?: boolean;
   },
+  path?: Path,
   deferUsage?: DeferUsage,
-  depth = 0,
 ): void {
   const {
     schema,
@@ -170,26 +172,26 @@ function collectFieldsImpl(
           operation,
           variableValues,
           selection,
+          path,
           deferUsage,
-          depth,
         );
 
         if (!newDeferUsage) {
           collectFieldsImpl(
             context,
             selection.selectionSet,
             groupedFieldSet,
+            path,
             deferUsage,
-            depth,
           );
         } else {
           groupedFieldSet.encounteredDefer = true;
           collectFieldsImpl(
             context,
             selection.selectionSet,
             groupedFieldSet,
+            path,
             newDeferUsage,
-            depth,
           );
         }
 
@@ -202,8 +204,8 @@ function collectFieldsImpl(
           operation,
           variableValues,
           selection,
+          path,
           deferUsage,
-          depth,
         );
 
         if (
@@ -227,17 +229,17 @@ function collectFieldsImpl(
             context,
             fragment.selectionSet,
             groupedFieldSet,
+            path,
             deferUsage,
-            depth,
           );
         } else {
           groupedFieldSet.encounteredDefer = true;
           collectFieldsImpl(
             context,
             fragment.selectionSet,
             groupedFieldSet,
+            path,
             newDeferUsage,
-            depth,
           );
         }
         break;
@@ -255,8 +257,8 @@ function getDeferUsage(
   operation: OperationDefinitionNode,
   variableValues: { [variable: string]: unknown },
   node: FragmentSpreadNode | InlineFragmentNode,
+  path: Path | undefined,
   parentDeferUsage: DeferUsage | undefined,
-  depth: number,
 ): DeferUsage | undefined {
   const defer = getDirectiveValues(GraphQLDeferDirective, node, variableValues);
 
@@ -276,7 +278,7 @@ function getDeferUsage(
   return {
     label: typeof defer.label === 'string' ? defer.label : undefined,
     parentDeferUsage,
-    depth,
+    depth: pathToArray(path).length,
   };
 }
 

src/execution/execute.ts

@@ -88,7 +88,7 @@ const collectSubfields = memoize3(
     exeContext: ExecutionContext,
     returnType: GraphQLObjectType,
     fieldGroup: FieldGroup,
-    depth: number,
+    path: Path,
   ) =>
     _collectSubfields(
       exeContext.schema,
@@ -97,7 +97,7 @@ const collectSubfields = memoize3(
       exeContext.operation,
       returnType,
       fieldGroup,
-      depth,
+      path,
     ),
 );
 
@@ -1630,7 +1630,7 @@ function collectAndExecuteSubfields(
     exeContext,
     returnType,
     fieldGroup,
-    path.depth,
+    path,
   );
   if (
     !exeContext.encounteredDefer &&

src/jsutils/Path.ts

@@ -4,7 +4,6 @@ export interface Path {
   readonly prev: Path | undefined;
   readonly key: string | number;
   readonly typename: string | undefined;
-  readonly depth: number;
 }
 
 /**
@@ -15,12 +14,7 @@ export function addPath(
   key: string | number,
   typename: string | undefined,
 ): Path {
-  return {
-    prev,
-    key,
-    typename,
-    depth: prev === undefined ? 1 : prev.depth + 1,
-  };
+  return { prev, key, typename };
 }
 
 /**

src/jsutils/__tests__/Path-test.ts

@@ -11,7 +11,6 @@ describe('Path', () => {
       prev: undefined,
       key: 1,
       typename: 'First',
-      depth: 1,
     });
   });
 
@@ -23,7 +22,6 @@ describe('Path', () => {
       prev: first,
       key: 'two',
       typename: 'Second',
-      depth: 2,
     });
   });