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fix: preserve non-plain Send args - #2409

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Christian Bromann (christian-bromann) merged 6 commits into
langchain-ai:mainfrom
pragnyanramtha:pragnyan/fix-send-non-plain-objects
Jun 1, 2026
Merged

fix: preserve non-plain Send args#2409
Christian Bromann (christian-bromann) merged 6 commits into
langchain-ai:mainfrom
pragnyanramtha:pragnyan/fix-send-non-plain-objects

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@pragnyanramtha

@pragnyanramtha Pragnyan Ramtha (pragnyanramtha) commented May 17, 2026

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Summary

  • preserve non-plain object instances while deserializing Send/Command argument trees
  • keep recursive reconstruction for arrays, plain object records, serialized Command, and serialized Send payloads
  • add a regression test covering Set, Map, Date, and a custom class instance passed through Send

Fixes part of #1142.

Test plan

  • pnpm install --frozen-lockfile
  • pnpm --filter @langchain/langgraph exec vitest run src/tests/constants.test.ts --testNamePattern "preserves non-plain objects"
  • pnpm --filter @langchain/langgraph exec vitest run src/tests/constants.test.ts
  • pnpm exec oxfmt --check libs/langgraph-core/src/constants.ts libs/langgraph-core/src/tests/constants.test.ts
  • pnpm exec oxlint libs/langgraph-core/src/constants.ts libs/langgraph-core/src/tests/constants.test.ts
  • git diff --check
  • pnpm --filter @langchain/langgraph build

Copilot AI review requested due to automatic review settings May 17, 2026 03:43
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🦋 Changeset detected

Latest commit: d406518

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages
Name Type
@langchain/langgraph Patch
@example/ai-elements Patch
@examples/assistant-ui-claude Patch
@examples/ui-angular Patch
@examples/ui-multimodal Patch
@examples/ui-react Patch
langgraph Patch

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@langchain/langgraph-checkpoint

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-checkpoint@2409

@langchain/langgraph-checkpoint-mongodb

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-checkpoint-mongodb@2409

@langchain/langgraph-checkpoint-postgres

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-checkpoint-postgres@2409

@langchain/langgraph-checkpoint-redis

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-checkpoint-redis@2409

@langchain/langgraph-checkpoint-sqlite

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-checkpoint-sqlite@2409

@langchain/langgraph-checkpoint-validation

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-checkpoint-validation@2409

create-langgraph

npm i https://pkg.pr.new/langchain-ai/langgraphjs/create-langgraph@2409

@langchain/langgraph-api

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-api@2409

@langchain/langgraph-cli

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-cli@2409

@langchain/langgraph

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph@2409

@langchain/langgraph-cua

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-cua@2409

@langchain/langgraph-supervisor

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-supervisor@2409

@langchain/langgraph-swarm

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-swarm@2409

@langchain/langgraph-ui

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-ui@2409

@langchain/langgraph-sdk

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-sdk@2409

@langchain/angular

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/angular@2409

@langchain/react

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/react@2409

@langchain/svelte

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/svelte@2409

@langchain/vue

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/vue@2409

commit: d406518

christian-bromann
Christian Bromann (christian-bromann) approved these changes Jun 1, 2026
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LGTM 👍

@christian-bromann
Christian Bromann (christian-bromann) merged commit 101b70a into langchain-ai:main Jun 1, 2026
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This was referenced Jun 1, 2026
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Christian Bromann (christian-bromann) pushed a commit that referenced this pull request Jun 1, 2026
@github-actions
chore: version packages (#2453)
d2ca90f 
This PR was opened by the [Changesets
release](https://github.com/changesets/action) GitHub action. When
you're ready to do a release, you can merge this and the packages will
be published to npm automatically. If you're not ready to do a release
yet, that's fine, whenever you add more changesets to main, this PR will
be updated.


# Releases
## @langchain/[email protected]

### Patch Changes

- [#2344](#2344)
[`0125920`](0125920)
Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps):
bump uuid to 14.0.0 and keep checkpoint ID ordering stable

Bump `uuid` from 10.x/13.x to 14.0.0 across packages. Starting with uuid
11, `v6({ clockseq })` no longer advances the sub-millisecond time
counter when an explicit `clockseq` is passed, so checkpoint IDs created
within the same millisecond were ordered only by `clockseq`. Since
checkpoint IDs are sorted lexicographically, this broke ordering — most
visibly for the negative `clockseq` used by the first ("input")
checkpoint, which sorted as the newest.

`uuid6()` now maintains its own monotonic `(msecs, nsecs)` clock
(mirroring uuid 10's internal v1 behavior) so the time component is
always strictly increasing and checkpoint ordering no longer depends on
the `clockseq` value. `emptyCheckpoint()` also uses a non-negative
`clockseq`.

## @langchain/[email protected]

### Patch Changes

- [#2186](#2186)
[`26c2e32`](26c2e32)
Thanks [@jackjin1997](https://github.com/jackjin1997)! - fix: metadata
filter in list() now works by querying a plain JSON shadow copy instead
of the serialized binary blob

## @langchain/[email protected]

### Patch Changes

- [#2255](#2255)
[`e82a50b`](e82a50b)
Thanks [@leesta24](https://github.com/leesta24)! -
fix(checkpoint-postgres): move serialization outside transaction in
put()

## @langchain/[email protected]

### Patch Changes

- [#2344](#2344)
[`0125920`](0125920)
Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps):
bump uuid to 14.0.0 and keep checkpoint ID ordering stable

Bump `uuid` from 10.x/13.x to 14.0.0 across packages. Starting with uuid
11, `v6({ clockseq })` no longer advances the sub-millisecond time
counter when an explicit `clockseq` is passed, so checkpoint IDs created
within the same millisecond were ordered only by `clockseq`. Since
checkpoint IDs are sorted lexicographically, this broke ordering — most
visibly for the negative `clockseq` used by the first ("input")
checkpoint, which sorted as the newest.

`uuid6()` now maintains its own monotonic `(msecs, nsecs)` clock
(mirroring uuid 10's internal v1 behavior) so the time component is
always strictly increasing and checkpoint ordering no longer depends on
the `clockseq` value. `emptyCheckpoint()` also uses a non-negative
`clockseq`.

## @langchain/[email protected]

### Patch Changes

- [#2344](#2344)
[`0125920`](0125920)
Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps):
bump uuid to 14.0.0 and keep checkpoint ID ordering stable

Bump `uuid` from 10.x/13.x to 14.0.0 across packages. Starting with uuid
11, `v6({ clockseq })` no longer advances the sub-millisecond time
counter when an explicit `clockseq` is passed, so checkpoint IDs created
within the same millisecond were ordered only by `clockseq`. Since
checkpoint IDs are sorted lexicographically, this broke ordering — most
visibly for the negative `clockseq` used by the first ("input")
checkpoint, which sorted as the newest.

`uuid6()` now maintains its own monotonic `(msecs, nsecs)` clock
(mirroring uuid 10's internal v1 behavior) so the time component is
always strictly increasing and checkpoint ordering no longer depends on
the `clockseq` value. `emptyCheckpoint()` also uses a non-negative
`clockseq`.

-   Updated dependencies \[]:
    -   @langchain/[email protected]

## @langchain/[email protected]

### Patch Changes

- [#1925](#1925)
[`6503319`](6503319)
Thanks [@jbrody-nexxa](https://github.com/jbrody-nexxa)! - fix(cli): add
--no-reload flag to dev command

- Updated dependencies
\[[`0125920`](0125920)]:
    -   @langchain/[email protected]

## @langchain/[email protected]

### Patch Changes

- [#2037](#2037)
[`9eb478f`](9eb478f)
Thanks [@pawel-twardziak](https://github.com/pawel-twardziak)! -
Decouple `ContextType` generic from `configurable` in `PregelOptions` so
that providing a custom context type no longer incorrectly narrows the
configurable parameter.

- [#2457](#2457)
[`91a5494`](91a5494)
Thanks [@christian-bromann](https://github.com/christian-bromann)! -
fix(langgraph): pass context with stateful RemoteGraph runs

Pop `thread_id` from run `config.configurable` and forward `context` to
the SDK so checkpointed remote runs accept user context without a 400
from ambiguous parameters. Closes
[#1922](#1922).

- [#1988](#1988)
[`6d4bf92`](6d4bf92)
Thanks [@Axadali](https://github.com/Axadali)! - Fix race condition in
IterableReadableWritableStream.push() that caused ERR_INVALID_STATE
errors when streaming with multiple parallel nodes and aborting the
stream.

- [#2409](#2409)
[`101b70a`](101b70a)
Thanks [@pragnyanramtha](https://github.com/pragnyanramtha)! - Preserve
non-plain objects passed through `Send` and `Command` argument
deserialization.

- [#2344](#2344)
[`0125920`](0125920)
Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps):
bump uuid to 14.0.0 and keep checkpoint ID ordering stable

Bump `uuid` from 10.x/13.x to 14.0.0 across packages. Starting with uuid
11, `v6({ clockseq })` no longer advances the sub-millisecond time
counter when an explicit `clockseq` is passed, so checkpoint IDs created
within the same millisecond were ordered only by `clockseq`. Since
checkpoint IDs are sorted lexicographically, this broke ordering — most
visibly for the negative `clockseq` used by the first ("input")
checkpoint, which sorted as the newest.

`uuid6()` now maintains its own monotonic `(msecs, nsecs)` clock
(mirroring uuid 10's internal v1 behavior) so the time component is
always strictly increasing and checkpoint ordering no longer depends on
the `clockseq` value. `emptyCheckpoint()` also uses a non-negative
`clockseq`.

- Updated dependencies
\[[`863b555`](863b555),
[`0125920`](0125920)]:
    -   @langchain/[email protected]
    -   @langchain/[email protected]

## @langchain/[email protected]

### Patch Changes

- [#2344](#2344)
[`0125920`](0125920)
Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps):
bump uuid to 14.0.0 and keep checkpoint ID ordering stable

Bump `uuid` from 10.x/13.x to 14.0.0 across packages. Starting with uuid
11, `v6({ clockseq })` no longer advances the sub-millisecond time
counter when an explicit `clockseq` is passed, so checkpoint IDs created
within the same millisecond were ordered only by `clockseq`. Since
checkpoint IDs are sorted lexicographically, this broke ordering — most
visibly for the negative `clockseq` used by the first ("input")
checkpoint, which sorted as the newest.

`uuid6()` now maintains its own monotonic `(msecs, nsecs)` clock
(mirroring uuid 10's internal v1 behavior) so the time component is
always strictly increasing and checkpoint ordering no longer depends on
the `clockseq` value. `emptyCheckpoint()` also uses a non-negative
`clockseq`.

## @langchain/[email protected]

### Patch Changes

- [#2455](#2455)
[`863b555`](863b555)
Thanks [@JHSeo-git](https://github.com/JHSeo-git)! - fix(sdk): prefer
completed task's direct mapping over pending checkpoint's positional
guess in fetchSubagentHistory

- [#2344](#2344)
[`0125920`](0125920)
Thanks [@dependabot](https://github.com/apps/dependabot)! - chore(deps):
bump uuid to 14.0.0 and keep checkpoint ID ordering stable

Bump `uuid` from 10.x/13.x to 14.0.0 across packages. Starting with uuid
11, `v6({ clockseq })` no longer advances the sub-millisecond time
counter when an explicit `clockseq` is passed, so checkpoint IDs created
within the same millisecond were ordered only by `clockseq`. Since
checkpoint IDs are sorted lexicographically, this broke ordering — most
visibly for the negative `clockseq` used by the first ("input")
checkpoint, which sorted as the newest.

`uuid6()` now maintains its own monotonic `(msecs, nsecs)` clock
(mirroring uuid 10's internal v1 behavior) so the time component is
always strictly increasing and checkpoint ordering no longer depends on
the `clockseq` value. `emptyCheckpoint()` also uses a non-negative
`clockseq`.

## @langchain/[email protected]

### Patch Changes

- Updated dependencies
\[[`863b555`](863b555),
[`0125920`](0125920)]:
    -   @langchain/[email protected]

## @langchain/[email protected]

### Patch Changes

- Updated dependencies
\[[`863b555`](863b555),
[`0125920`](0125920)]:
    -   @langchain/[email protected]

## @langchain/[email protected]

### Patch Changes

- Updated dependencies
\[[`863b555`](863b555),
[`0125920`](0125920)]:
    -   @langchain/[email protected]

## @langchain/[email protected]

### Patch Changes

- Updated dependencies
\[[`863b555`](863b555),
[`0125920`](0125920)]:
    -   @langchain/[email protected]

## @langchain/[email protected]



## @example/[email protected]

### Patch Changes

- Updated dependencies
\[[`9eb478f`](9eb478f),
[`91a5494`](91a5494),
[`6d4bf92`](6d4bf92),
[`101b70a`](101b70a),
[`0125920`](0125920)]:
    -   @langchain/[email protected]
    -   @langchain/[email protected]

## @examples/[email protected]

### Patch Changes

- Updated dependencies
\[[`9eb478f`](9eb478f),
[`91a5494`](91a5494),
[`6d4bf92`](6d4bf92),
[`101b70a`](101b70a),
[`0125920`](0125920)]:
    -   @langchain/[email protected]
    -   @langchain/[email protected]

## @examples/[email protected]

### Patch Changes

- Updated dependencies
\[[`863b555`](863b555),
[`9eb478f`](9eb478f),
[`91a5494`](91a5494),
[`6d4bf92`](6d4bf92),
[`101b70a`](101b70a),
[`0125920`](0125920)]:
    -   @langchain/[email protected]
    -   @langchain/[email protected]
    -   @langchain/[email protected]

## @examples/[email protected]

### Patch Changes

- Updated dependencies
\[[`9eb478f`](9eb478f),
[`91a5494`](91a5494),
[`6d4bf92`](6d4bf92),
[`101b70a`](101b70a),
[`0125920`](0125920)]:
    -   @langchain/[email protected]
    -   @langchain/[email protected]

## @examples/[email protected]

### Patch Changes

- Updated dependencies
\[[`863b555`](863b555),
[`9eb478f`](9eb478f),
[`91a5494`](91a5494),
[`6d4bf92`](6d4bf92),
[`101b70a`](101b70a),
[`0125920`](0125920)]:
    -   @langchain/[email protected]
    -   @langchain/[email protected]
    -   @langchain/[email protected]

## [email protected]

### Patch Changes

- Updated dependencies
\[[`9eb478f`](9eb478f),
[`91a5494`](91a5494),
[`6d4bf92`](6d4bf92),
[`101b70a`](101b70a),
[`0125920`](0125920)]:
    -   @langchain/[email protected]

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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@pragnyanramtha @christian-bromann