fix(batch-delegate): correct error paths in case of batch delegation

[ardatan]

Closes ardatan/graphql-tools#2951
Fixes ardatan/graphql-tools#2950

[Copilot]

Pull Request Overview

This PR fixes error path handling in batch delegation scenarios where the same error occurs multiple times. The fix ensures that error paths are correctly preserved when using batch delegation, preventing duplicate error reporting while maintaining proper error location information.

• Changed error tracking from WeakMap to WeakSet for more appropriate duplicate detection
• Added error path relocation handling in batch delegation to preserve GraphQL error paths
• Added comprehensive test coverage to verify error path preservation in both regular and batch delegation

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
packages/delegate/src/resolveExternalValue.ts	Optimizes error tracking by switching from WeakMap to WeakSet
packages/batch-delegate/src/batchDelegateToSchema.ts	Adds error path relocation handling for batch delegation
packages/batch-delegate/tests/errorPaths.test.ts	Adds test coverage for error path preservation in delegation scenarios
.changeset/breezy-weeks-camp.md	Documents the patch changes for both affected packages

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[theguild-bot]

🚀 Snapshot Release (alpha)

The latest changes of this PR are available as alpha on npm (based on the declared changesets):

Package	Version	Info
@graphql-tools/batch-delegate	10.0.2-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51	npm ↗︎ unpkg ↗︎
@graphql-tools/delegate	11.0.2-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51	npm ↗︎ unpkg ↗︎
@graphql-tools/federation	4.0.6-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51	npm ↗︎ unpkg ↗︎
@graphql-mesh/fusion-runtime	1.2.6-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51	npm ↗︎ unpkg ↗︎
@graphql-hive/gateway	2.1.11-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51	npm ↗︎ unpkg ↗︎
@graphql-hive/nestjs	2.0.16-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51	npm ↗︎ unpkg ↗︎
@graphql-hive/plugin-aws-sigv4	2.0.11-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51	npm ↗︎ unpkg ↗︎
@graphql-hive/plugin-opentelemetry	1.0.13-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51	npm ↗︎ unpkg ↗︎
@graphql-mesh/plugin-prometheus	2.0.14-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51	npm ↗︎ unpkg ↗︎
@graphql-hive/gateway-runtime	2.1.10-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51	npm ↗︎ unpkg ↗︎
@graphql-tools/stitch	10.0.3-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51	npm ↗︎ unpkg ↗︎
@graphql-tools/stitching-directives	4.0.2-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51	npm ↗︎ unpkg ↗︎
@graphql-tools/wrap	11.0.2-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51	npm ↗︎ unpkg ↗︎

[theguild-bot]

🚀 Snapshot Release (Binary for Linux-X64)

The latest changes of this PR are available for download (based on the declared changesets).

[theguild-bot]

🚀 Snapshot Release (Binary for Linux-ARM64)

The latest changes of this PR are available for download (based on the declared changesets).

[theguild-bot]

🚀 Snapshot Release (Binary for macOS-ARM64)

The latest changes of this PR are available for download (based on the declared changesets).

[theguild-bot]

🚀 Snapshot Release (Binary for Windows-X64)

The latest changes of this PR are available for download (based on the declared changesets).

[theguild-bot]

🚀 Snapshot Release (Binary for macOS-X64)

The latest changes of this PR are available for download (based on the declared changesets).

[theguild-bot]

🚀 Snapshot Release (Node Docker Image)

The latest changes of this PR are available as image on GitHub Container Registry (based on the declared changesets):

ghcr.io/graphql-hive/gateway:2.1.11-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51

[theguild-bot]

🚀 Snapshot Release (Bun Docker Image)

The latest changes of this PR are available as image on GitHub Container Registry (based on the declared changesets):

ghcr.io/graphql-hive/gateway:2.1.11-alpha-14e4b0ce773be2d357065c1e138a2b8366018c51-bun