fix(core): reject open() on system teardown via cancelAll

[SutuSebastian]

Summary

• Add LayerCancelledError / isLayerCancelledError and LayerStack/LayerClient.cancelAll for system teardown (Query-style cancel reject)
• Parent-dismiss child drain, layer-group dispose, Lit disconnect, and Devtools clear-without-response use cancelAll instead of dismissAll(undefined)
• dismissAll(response) still resolves with R (void stays unambiguous)

Breaking note

Apps that awaited child/group open() through parent dismiss or group unmount previously got undefined. They now reject with LayerCancelledError — narrow with isLayerCancelledError and do not treat cancel as user “No”.

Test plan

• bun test layerStack / layerGroup / live-actions cancel paths
• Pre-commit typecheck + unit/DOM across touched packages
• docs:check --isolated
• CI green

Summary by CodeRabbit

• New Features

  • Added cancelAll support for clearing layer stacks.
  • Layer openings now reject with LayerCancelledError when cancelled during teardown, parent dismissal, group disposal, or disconnect.
  • Added cancellation reasons and isLayerCancelledError for handling cancellation safely.
  • User-driven dismissals continue resolving with their response values.

• Documentation

  • Updated API references and guides to explain cancellation, blockers, nested layers, and error handling.

[changeset-bot]

🦋 Changeset detected

Latest commit: a31df36

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

This PR includes changesets to release 11 packages

Name	Type
@stainless-code/layers	Patch
@stainless-code/react-layers	Patch
@stainless-code/preact-layers	Patch
@stainless-code/vue-layers	Patch
@stainless-code/solid-layers	Patch
@stainless-code/angular-layers	Patch
@stainless-code/svelte-layers	Patch
@stainless-code/alpine-layers	Patch
@stainless-code/lit-layers	Patch
@stainless-code/layers-devtools	Patch
@stainless-code/react-layers-devtools	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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📥 Commits

Reviewing files that changed from the base of the PR and between def96f3 and a31df36.

📒 Files selected for processing (60)

• .agents/skills/harden-pr/LEDGER.md
• .changeset/layer-cancelled-error.md
• apps/docs/content/concepts/identity-and-types.mdx
• apps/docs/content/examples/nested-confirm.mdx
• apps/docs/content/guides/awaiting-results.mdx
• apps/docs/content/guides/devtools.mdx
• apps/docs/content/guides/nested-overlays.mdx
• apps/docs/content/integrations/base-ui/index.mdx
• apps/docs/content/integrations/react-aria/index.mdx
• apps/docs/islands/BlockersForceExample.tsx
• apps/docs/islands/HeroDemo.tsx
• apps/docs/islands/NestedConfirmExample.tsx
• apps/docs/recipes/blockers-force/angular.ts
• apps/docs/recipes/blockers-force/preact.tsx
• apps/docs/recipes/blockers-force/react.tsx
• apps/docs/recipes/blockers-force/react.wiring.tsx
• apps/docs/recipes/blockers-force/solid.tsx
• apps/docs/recipes/blockers-force/svelte-runes.svelte
• apps/docs/recipes/blockers-force/svelte-store.svelte
• apps/docs/recipes/blockers-force/vue.vue
• apps/docs/recipes/nested-confirm/angular.ts
• apps/docs/recipes/nested-confirm/preact.tsx
• apps/docs/recipes/nested-confirm/react.baseui.tsx
• apps/docs/recipes/nested-confirm/react.rac.tsx
• apps/docs/recipes/nested-confirm/react.tsx
• apps/docs/recipes/nested-confirm/react.wiring.tsx
• apps/docs/recipes/nested-confirm/solid.tsx
• apps/docs/recipes/nested-confirm/svelte-runes.svelte
• apps/docs/recipes/nested-confirm/svelte-store.svelte
• apps/docs/recipes/nested-confirm/vue.vue
• docs/architecture.md
• packages/alpine/src/index.ts
• packages/angular/skills/angular-layers/SKILL.md
• packages/angular/src/index.ts
• packages/core/skills/layers/SKILL.md
• packages/core/src/errors.ts
• packages/core/src/layerClient.ts
• packages/core/src/layerGroup.test.ts
• packages/core/src/layerGroup.ts
• packages/core/src/layerStack.test.ts
• packages/core/src/layerStack.ts
• packages/core/src/types.ts
• packages/devtools/src/components/StackActions.tsx
• packages/devtools/src/index.ts
• packages/devtools/src/live-actions.test.ts
• packages/devtools/src/live-actions.ts
• packages/devtools/src/production.ts
• packages/lit/src/index.test.ts
• packages/lit/src/index.ts
• packages/preact/skills/preact-layers/SKILL.md
• packages/preact/src/index.ts
• packages/react/skills/react-layers/SKILL.md
• packages/react/src/index.tsx
• packages/solid/skills/solid-layers/SKILL.md
• packages/solid/src/index.ts
• packages/svelte/skills/svelte-layers/SKILL.md
• packages/svelte/src/index.ts
• packages/svelte/src/store.ts
• packages/vue/skills/vue-layers/SKILL.md
• packages/vue/src/index.ts

📝 Walkthrough

Walkthrough

Adds cancelAll to layer clients and stacks, introducing LayerCancelledError for rejected pending opens. Parent dismissal, group disposal, host disconnect, and devtools teardown now use reasoned cancellation while user dismissal continues to resolve normally.

Changes

Layer cancellation semantics

Layer / File(s)	Summary
Cancellation contract and stack execution packages/core/src/errors.ts, packages/core/src/index.ts, packages/core/src/types.ts, packages/core/src/layerStack.ts, packages/core/src/layerStack.test.ts	Adds cancellation reasons, error narrowing, public exports, stack-wide cancellation, blocker bypass, cleanup, notifications, and coverage for active and queued opens.
Cancellation orchestration and teardown integrations packages/core/src/layerClient.ts, packages/*/src/*, packages/devtools/src/*, packages/core/src/layerGroup.test.ts	Routes parent cascades, group disposal, disconnect cleanup, and devtools force actions through cancelAll with explicit reasons.
API and lifecycle documentation apps/docs/content/**, docs/**, packages/core/skills/layers/SKILL.md, .changeset/layer-cancelled-error.md	Documents cancellation APIs, rejection behavior, blocker handling, error narrowing, lifecycle semantics, and the patch release.
Estimated code review effort: 4 (Complex)	~45 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant LayerClient
  participant LayerStack
  Caller->>LayerClient: open()
  LayerClient->>LayerStack: create active or queued layer
  LayerClient->>LayerStack: cancelAll(reason)
  LayerStack-->>Caller: reject with LayerCancelledError

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Possibly related PRs

• stainless-code/layers#7: Also updates Lit layer-group teardown behavior and child open-promise outcomes.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: system teardown now rejects open() via cancelAll in core.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/layer-cancelled-error

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