extract to separate file

src/execution/DeferredFragmentFactory.ts

@@ -0,0 +1,65 @@
+import type { Path } from '../jsutils/Path.js';
+
+import type { DeferUsage } from './collectFields.js';
+import { DeferredFragmentRecord } from './types.js';
+
+/**
+ * @internal
+ */
+export class DeferredFragmentFactory {
+  private _rootDeferredFragments = new Map<
+    DeferUsage,
+    DeferredFragmentRecord
+  >();
+
+  get(deferUsage: DeferUsage, path: Path | undefined): DeferredFragmentRecord {
+    const deferUsagePath = this._pathAtDepth(path, deferUsage.depth);
+    let deferredFragmentRecords:
+      | Map<DeferUsage, DeferredFragmentRecord>
+      | undefined;
+    if (deferUsagePath === undefined) {
+      deferredFragmentRecords = this._rootDeferredFragments;
+    } else {
+      deferredFragmentRecords = (
+        deferUsagePath as unknown as {
+          deferredFragmentRecords: Map<DeferUsage, DeferredFragmentRecord>;
+        }
+      ).deferredFragmentRecords;
+      if (deferredFragmentRecords === undefined) {
+        deferredFragmentRecords = new Map();
+        (
+          deferUsagePath as unknown as {
+            deferredFragmentRecords: Map<DeferUsage, DeferredFragmentRecord>;
+          }
+        ).deferredFragmentRecords = deferredFragmentRecords;
+      }
+    }
+    let deferredFragmentRecord = deferredFragmentRecords.get(deferUsage);
+    if (deferredFragmentRecord === undefined) {
+      const { label, parentDeferUsage } = deferUsage;
+      deferredFragmentRecord = new DeferredFragmentRecord(
+        deferUsagePath,
+        label,
+        parentDeferUsage,
+      );
+      deferredFragmentRecords.set(deferUsage, deferredFragmentRecord);
+    }
+    return deferredFragmentRecord;
+  }
+
+  private _pathAtDepth(
+    path: Path | undefined,
+    depth: number,
+  ): Path | undefined {
+    if (depth === 0) {
+      return;
+    }
+    const stack: Array<Path> = [];
+    let currentPath = path;
+    while (currentPath !== undefined) {
+      stack.unshift(currentPath);
+      currentPath = currentPath.prev;
+    }
+    return stack[depth - 1];
+  }
+}

src/execution/IncrementalGraph.ts

@@ -7,7 +7,9 @@ import { promiseWithResolvers } from '../jsutils/promiseWithResolvers.js';
 import type { GraphQLError } from '../error/GraphQLError.js';
 
 import type { DeferUsage } from './collectFields.js';
+import { DeferredFragmentFactory } from './DeferredFragmentFactory.js';
 import type {
+  DeferredFragmentRecord,
   DeliveryGroup,
   IncrementalDataRecord,
   IncrementalDataRecordResult,
@@ -16,72 +18,7 @@ import type {
   StreamRecord,
   SuccessfulExecutionGroup,
 } from './types.js';
-import {
-  DeferredFragmentRecord,
-  isDeferredFragmentRecord,
-  isPendingExecutionGroup,
-} from './types.js';
-
-/**
- * @internal
- */
-class DeferredFragmentFactory {
-  private _rootDeferredFragments = new Map<
-    DeferUsage,
-    DeferredFragmentRecord
-  >();
-
-  get(deferUsage: DeferUsage, path: Path | undefined): DeferredFragmentRecord {
-    const deferUsagePath = this._pathAtDepth(path, deferUsage.depth);
-    let deferredFragmentRecords:
-      | Map<DeferUsage, DeferredFragmentRecord>
-      | undefined;
-    if (deferUsagePath === undefined) {
-      deferredFragmentRecords = this._rootDeferredFragments;
-    } else {
-      deferredFragmentRecords = (
-        deferUsagePath as unknown as {
-          deferredFragmentRecords: Map<DeferUsage, DeferredFragmentRecord>;
-        }
-      ).deferredFragmentRecords;
-      if (deferredFragmentRecords === undefined) {
-        deferredFragmentRecords = new Map();
-        (
-          deferUsagePath as unknown as {
-            deferredFragmentRecords: Map<DeferUsage, DeferredFragmentRecord>;
-          }
-        ).deferredFragmentRecords = deferredFragmentRecords;
-      }
-    }
-    let deferredFragmentRecord = deferredFragmentRecords.get(deferUsage);
-    if (deferredFragmentRecord === undefined) {
-      const { label, parentDeferUsage } = deferUsage;
-      deferredFragmentRecord = new DeferredFragmentRecord(
-        deferUsagePath,
-        label,
-        parentDeferUsage,
-      );
-      deferredFragmentRecords.set(deferUsage, deferredFragmentRecord);
-    }
-    return deferredFragmentRecord;
-  }
-
-  private _pathAtDepth(
-    path: Path | undefined,
-    depth: number,
-  ): Path | undefined {
-    if (depth === 0) {
-      return;
-    }
-    const stack: Array<Path> = [];
-    let currentPath = path;
-    while (currentPath !== undefined) {
-      stack.unshift(currentPath);
-      currentPath = currentPath.prev;
-    }
-    return stack[depth - 1];
-  }
-}
+import { isDeferredFragmentRecord, isPendingExecutionGroup } from './types.js';
 
 /**
  * @internal