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feat!: make channels.release() throw unless the channel is detached (RTS4e) - #2323

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release-throw-unless-detached
Oct 9, 2026
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SimonWoolf merged 1 commit into
integration/v3from
release-throw-unless-detached

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@SimonWoolf SimonWoolf commented Oct 8, 2026 •

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Implements ably/specification#557 (spec 6.3.0) for v3.

Breaking change: channels.release(name) now throws an ErrorInfo with code 90011 when the channel isn't in the initialized, detached or failed state. Previously it detached the channel and removed it once the detach completed. Call channel.detach() and await it before releasing.

Under the old behaviour (RTS4a), the channel stayed in the collection while the detach was in flight. A get() for the same name in that window returned the channel that was about to be removed, which then received no further messages. release() is now synchronous, and removes the channel either immediately or not at all (RTS4c–e).

The UTS-derived tests are updated to the spec's RTS4c–e tests (per ably/specification#563).

Depends on ably/ably-common#367, which registers 90011. The ably-common submodule is currently pinned to that PR's branch commit, and should be re-pinned to main once it merges.

The deprecation warning for v2 is in #2322. When main is next merged into integration/v3, take this branch's side of baserealtime.ts.

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Summary by CodeRabbit

  • Behavior Changes
    • Releasing a channel is allowed only when it is initialized, detached, or failed. A channel in another state remains attached and in the collection; release returns an error with code 90011 and status 400.
    • Releasing an eligible channel removes it from the collection. Releasing a channel that does not exist remains a no-op.

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  • packages/core/src/common/lib/client/baserealtime.ts
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  • packages/core/src/common/lib/types/errorcodes.ts
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  • packages/core/test/uts/realtime/unit/channels/channels_collection.test.ts

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Walkthrough

Channels.release now throws an error when the channel cannot be released. Otherwise, it removes the channel from the collection without detaching it. The release error uses code 90011. The API comment and tests reflect this behavior.

Changes

Channel Release

Layer / File(s) Summary
Release contract and behavior
packages/core/ably.d.ts, packages/core/src/common/lib/client/baserealtime.ts, packages/core/src/common/lib/client/realtimechannel.ts, packages/core/src/common/lib/types/errorcodes.ts
The API comment specifies the allowed channel states. Channels.release checks getReleaseErr() and throws its error when present; otherwise, it immediately removes the channel from the collection. The release error code is 90011. The ErrorCode union adds 50007, 90011, and 103010.
Release state tests
packages/core/test/uts/realtime/unit/channels/channels_collection.test.ts, packages/core/test/common/ably-common
Tests cover release of missing, initialized, and detached channels. They also verify that releasing an attached channel throws error 90011 with status 400, leaves it attached and registered, and sends no DETACH message. The common test subproject reference is updated.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Merge Risk: 🔵 Low · up to 022aa

The change appears mergeable with a documentation follow-up: callers can see which states permit release, but the public declaration should explicitly describe the new exception.

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Docstring Coverage Warning Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 5 files. (1 skipped: 1 … Write docstrings for the functions missing them to satisfy the coverage threshold.
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Linked Issues check Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check Passed Check skipped because no linked issues were found for this pull request.
Description Check Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check Passed The title clearly identifies the main breaking change in channels.release(): it now throws for channels that are not safe to release. It simplifies the allowed states by naming only detached, but it r…
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Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 5 files. (1 skipped: 1 unsupported.)

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A rabbit checks each channel’s state
No DETACH hops when release must wait
The safe ones leave the collection
Error 90011 marks rejection
Then off I bound through clover green

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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @packages/core/ably.d.ts:
- Line 3455: Update the release() documentation to state that it throws
ErrorInfo with code 90001 and does not release the channel when the channel is
outside the releasable states, and instruct callers to await channel.detach()
before calling release(). Add the corresponding @throws documentation while
preserving the existing description.

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  • packages/core/ably.d.ts
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  • packages/core/test/uts/realtime/unit/channels/channels_collection.test.ts

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Comment thread packages/core/ably.d.ts
getDerived(name: string, deriveOptions: DeriveOptions, channelOptions?: ChannelOptions): T;
/**
* Releases all SDK-held references to a {@link Channel} or {@link RealtimeChannel} object, enabling it to be garbage collected. Warning: this method has no guardrails; using a channel reference after it has been released is undefined behaviour. It can be useful for applications that work with a continually changing set of channels on a single client and need to avoid unbounded memory growth; if this does not describe you, don't call it. Realtime channels not already in the `INITIALIZED`, `DETACHED`, or `FAILED` state are detached before release.
* Releases all SDK-held references to a {@link Channel} or {@link RealtimeChannel} object, enabling it to be garbage collected. Warning: this method has no guardrails; using a channel reference after it has been released is undefined behaviour. It can be useful for applications that work with a continually changing set of channels on a single client and need to avoid unbounded memory growth; if this does not describe you, don't call it. A realtime channel can only be released when it is in the `INITIALIZED`, `DETACHED`, or `FAILED` state.

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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

Document the thrown error and the required detach step.

release() now throws an ErrorInfo with code 90001 for channels in the attaching, attached, detaching, and suspended states. This is a breaking change from the earlier behavior, where release() detached the channel first. The comment states which states are allowed. It does not say that release() throws in other states, and it does not tell callers to await channel.detach() first. A caller that relies on the old behavior will get an uncaught synchronous exception.

Proposed doc update
-   * ... A realtime channel can only be released when it is in the `INITIALIZED`, `DETACHED`, or `FAILED` state.
+   * ... A realtime channel can only be released when it is in the `INITIALIZED`, `DETACHED`, or `FAILED` state. In any other state, this method throws an {@link ErrorInfo} with code 90001 and does not release the channel. Call `await channel.detach()` before calling `release()`.
    *
    * @param name - The channel name.
+   * @throws {@link ErrorInfo} with code 90001 if the channel is not in a releasable state.
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Review comment at @packages/core/ably.d.ts at line 3455:
Update the release() documentation to state that it throws ErrorInfo with code
90001 and does not release the channel when the channel is outside the
releasable states, and instruct callers to await channel.detach() before calling
release(). Add the corresponding @throws documentation while preserving the
existing description.

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review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr

…RTS4e)

BREAKING CHANGE: channels.release(name) now throws an ErrorInfo with
code 90011 when the channel is not in the initialized, detached or
failed state, instead of detaching it and removing it once the detach
completes. Call channel.detach() and await it before releasing.

Spec 6.3.0 replaces RTS4a with RTS4c-e. Under RTS4a the channel stayed
in the collection for the duration of the detach, so a get() for the
same name in that window returned the channel that was about to be
removed, which then received no further messages. release() is now
synchronous and removes the channel immediately or not at all.

Bumps the ably-common pin to pick up the registration of 90011.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
@SimonWoolf
SimonWoolf force-pushed the release-throw-unless-detached branch from 12c2f06 to 022aa4e Compare October 9, 2026 03:34
@SimonWoolf SimonWoolf changed the title feat!: make channels.release() throw unless the channel is detached (RTS4d) feat!: make channels.release() throw unless the channel is detached (RTS4e) Oct 9, 2026

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LGTM

@SimonWoolf
SimonWoolf merged commit c8cc89d into integration/v3 Oct 9, 2026
24 of 27 checks passed
@SimonWoolf
SimonWoolf deleted the release-throw-unless-detached branch October 9, 2026 16:16

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