@@ -0,0 +1,24 @@
+---
+'@object-ui/types': minor
+---
+
+`ObjectKanbanSchema.grouping` is declared on both faces, as `@objectstack/spec`'s `GroupingConfig`, by reference (objectui#11216).
+
+The spec's `object-kanban` row types `grouping` as the list view's own `GroupingConfigSchema`. `ObjectKanban` reads `grouping.fields[0].field` as the fallback for `swimlaneField`. Until this change the key was undeclared on the `object-kanban` arm, so this package and the spec gave three different answers for one document:
+
+| `grouping` value | spec row | strict authoring face (before → now) | tolerant face (before → now) |
+|---|---|---|---|
+| `{ fields: [{ field: 'owner' }] }` | accepted | refused by name → **accepted** | kept → accepted, kept as authored |
+| a padded field name, `{ fields: [{ field: '  x  ' }] }` | refused | refused by name → refused at `fields.0.field` | kept → **refused** |
+| a bare string, `'owner'` | refused | refused by name → refused at `grouping` | kept → **refused** |
+| an empty list, `{ fields: [] }` | refused | refused by name → refused at `fields` | kept → **refused** |
+| an undeclared key on the block or on an entry | refused | refused by name → refused by name inside the block | kept → **refused** |
+
+- **Zod mirror.** `grouping: stripImportedDefaults(GroupingConfigSchema).optional()`, which is how `ObjectGridSchema.grouping` spells it. The spec's `order` and `collapsed` defaults are not added to a parsed document.
+- **TypeScript.** `grouping?: GroupingConfig`, the spec's authored type. It is the same type as the `object-kanban` row's `grouping`.
+
+**Not changed: the board.** `ObjectKanban` reads `fields[0].field` and nothing else in the block. The registration's input description says so, and it is unchanged.
+
+**Migration.** Write `grouping` as `{ fields: [{ field }] }` with an unpadded field name, or delete it and author `swimlaneField`, which the board reads first.
+
+**minor, not patch.** The member is new in the shipped `.d.ts` and in the zod mirror's `.shape`. The tolerant face now refuses the shapes in the table that it used to keep unjudged.
@@ -17,3 +17,12 @@ Small reader sites stop riding `BaseSchema`'s index signature (objectui#11355, p
 - `@object-ui/plugin-map`: the dev warning about flat map keys that a `map` block shadows reads those keys through their own type, not through a `Record` conversion.
 
 **minor, not patch, for `@object-ui/types`.** Both members are new in the shipped `.d.ts` and in the zod mirror's `.shape`, and the mirror now refuses a wrongly typed value for each, where it used to keep one unjudged.
+
+⚠️ **Dated note, 2026-10-03 — `ObjectKanbanSchema.grouping` is now declared — objectui#11216.**
+At this change `grouping`, the fallback `ObjectKanban` reads for `swimlaneField`,
+was undeclared on both faces, as the first bullet above says. objectui#11216
+declares it on both faces in this release, by reference: the TypeScript member is
+the spec's `GroupingConfig`, and the zod mirror takes the spec's
+`GroupingConfigSchema`, the type the `object-kanban` row gives the key. So the
+sentence above that calls `grouping` "still undeclared" does not hold in this
+release. The rest of this entry is kept as the reading of this change.
@@ -3018,7 +3018,7 @@ const MEMBER_PINS: Record<string, MemberPin> = {
   },
   'object-kanban.grouping': {
     file: 'packages/plugin-kanban/src/__tests__/ObjectKanban.structuredMembersReachTheirSinks-8313.test.tsx',
-    pins: 'ONE nested position and no more: `schema.grouping?.fields?.[0]?.field` is the FALLBACK source of `swimlaneField`, and that is the entire member contract this board carries for the key. Three rows make it a reading rather than a claim — the swimlane layout appears keyed by `fields[0].field` where without the key there is none; an explicit `swimlaneField` WINS over it; and a second `fields` entry changes nothing, which is what pins the read at `[0]` rather than at "the fields list". The declared description says the rest is inert precisely so the declaration does not recommend a write the renderer cannot honour — this file is what keeps that sentence true. The spec row is `z.unknown()`, so the read site is the whole member contract (objectui#8313).',
+    pins: 'ONE nested position and no more: `schema.grouping?.fields?.[0]?.field` is the FALLBACK source of `swimlaneField`, and that is the entire member contract this board carries for the key. Three rows make it a reading rather than a claim — the swimlane layout appears keyed by `fields[0].field` where without the key there is none; an explicit `swimlaneField` WINS over it; and a second `fields` entry changes nothing, which is what pins the read at `[0]` rather than at "the fields list". The declared description says the rest is inert precisely so the declaration does not recommend a write the renderer cannot honour — this file is what keeps that sentence true. The spec row types the block as the list view\'s `GroupingConfigSchema`, which both `@object-ui/types` faces take by reference (objectui#11216): that fixes its SHAPE, not which position this board reads, so the read site is still the whole of what the board does with a member (objectui#8313).',
   },
   'object-kanban.navigation': {
     file: 'packages/plugin-kanban/src/__tests__/kanbanNavigationMembers-8652.test.tsx',
 
@@ -1010,6 +1010,7 @@ A drag-and-drop Kanban board. The `object-kanban` type key validates the shape t
 | `titleField` | `string` | Field used as the card title. |
 | `cardFields` | `string[]` | Fields rendered on each card. |
 | `swimlaneField` | `string` | Record field that splits the board into horizontal swimlanes, across the `groupBy` columns. Declared on both faces since objectui#11355, with the type `@objectstack/spec`'s `object-kanban` row gives it. With the key absent the board falls back to `grouping.fields[0].field`. |
+| `grouping` | `GroupingConfig` | The fallback for `swimlaneField`: with that key absent, the board splits into swimlanes by `grouping.fields[0].field`, and reads nothing else in the block. The type is `@objectstack/spec`'s `GroupingConfig` (`{ fields: [{ field, order?, collapsed? }] }`), the one the `object-kanban` row and `object-grid` take, by reference on both faces since objectui#11216: at least one entry, no undeclared key, and a `field` written without leading or trailing spaces. |
 | `filter` | `any[]` | Query filter, forwarded verbatim as `$filter`. |
 | `limit` | `number` | Fetch window for the board (default 100). |
 | `coverImageField` | `string` | Field whose URL renders as the card cover image. |
@@ -1024,7 +1025,7 @@ A drag-and-drop Kanban board. The `object-kanban` type key validates the shape t
 >
 > ⚠️ The **bare-string array applies only to a board with no `groupBy`.** It is declared so this package does not refuse an authoring the protocol allows. The renderer reads a bare-string lane list only when a board has no `groupBy` — so on a board that *does* declare one the strings are ignored and the lanes come from the group field's picklist options or from the data. Since objectui#8990 made `groupBy` optional, a lane-less board is a valid authoring and this arm is live on it: the lanes are drawn, titled by the **raw strings** (a grouped board titles its lanes with the picklist *labels* instead). ⚠️ Such a board holds **no cards** — with no lane key the records are never distributed — and dragging a card writes nothing back. It is lane headings, not a populated board; to control the lanes of a working board, declare `groupBy` and write the `{ id, title }` array.
 >
-> Of the other keys the retired `kanban` arm alone declared, `cardTitle` (objectui#9606), `navigation` (objectui#8652) and `swimlaneField` (objectui#11355) are declared on this face; `grouping` is still undeclared. The renderer reads it as the fallback for `swimlaneField`, so a board may carry it; it is simply not judged. Aligning it with the spec's typed row is objectui#11216.
+> Of the other keys the retired `kanban` arm alone declared, `cardTitle` (objectui#9606), `navigation` (objectui#8652), `swimlaneField` (objectui#11355) and `grouping` (objectui#11216) are declared on this face. `grouping` was the last of them: until objectui#11216 it was kept unjudged here and refused by name on the strict authoring face.
 
 > **Handler keys are not authorable in JSON, and all three now say so by name.** Since objectui#7804 this face declares `onCardClick` as an objectui#6124 **runtime slot**: a React host supplies the function through the TypeScript interface or as a React prop, and this validator **refuses the key by name** with a message pointing at the node-type spelling (`{ "type": "toast", … }`, an `action:button` node). Until then an authored `onCardClick: { "action": "toast" }` parsed **green** — `BaseSchema` is `.passthrough()`, so a key no arm declares is not refused, it stops being judged and the value is kept, then reaches a call site expecting a function. ⭐ The other two keys are **tombstones**, not runtime slots, so their TypeScript twins are `?: never` rather than callable. `onCardMove` has been one since objectui#9342: an authored one reached **nothing** even as a function, because an object-bound board substitutes its own mover, and the mover lives on `KanbanRenderer`'s React prop of the same name, a sibling of its `schema`. `onQuickAdd` has been one since objectui#11234: a supplied one reached the board and was never called, because its partner `quickAdd` is retired here. `ObjectKanban` renders an internal board that takes the Quick Add pair only as explicit props and supplies neither half; the pair lives on `KanbanRenderer`'s `schema`, for a React host.
 
 
@@ -174,6 +174,7 @@ interface KanbanCard {
 | `limit` | number | Rows fetched by an object-driven board (default 100) |
 | `navigation` | `ViewNavigationConfig` | What a card click opens — the spec's `NavigationConfig` by reference, the type `ObjectGridSchema.navigation` uses: `mode` (`page`, `drawer`, `modal`, `split`, `popover`, `new_window` or `none`) with `size`, `openNewTab` and `preventNavigation`. With the key absent a click opens the record in a drawer, and a click handler from a parent view outranks the whole key. `page` — and a block written without `mode`, which takes the spec's `page` default — opens the record page through the record navigator the host publishes (objectui#11293); the console publishes one on its custom pages, record pages and list views, and under a host that publishes none the click opens nothing. |
 | `swimlaneField` | string | Record field that splits an object-driven board into horizontal swimlanes, across the `groupBy` columns. `@objectstack/spec` declares it on `object-kanban`, and both faces of `@object-ui/types` declare it since objectui#11355. With the key absent the board falls back to `grouping.fields[0].field` |
+| `grouping` | `GroupingConfig` | The fallback for `swimlaneField`: with that key absent, the board splits into swimlanes by `grouping.fields[0].field`. Nothing else in the block is read on this board. The type is `@objectstack/spec`'s `GroupingConfig`, `{ fields: [{ field, order?, collapsed? }] }`, which both faces of `@object-ui/types` take by reference since objectui#11216: at least one entry, no undeclared key, and a `field` without leading or trailing spaces |
 | `className` | string | Additional Tailwind CSS classes |
 
 ### Lane Properties
 
@@ -49,15 +49,20 @@
  *     against what. One dialect since objectui#11522, `{ condition, style }`,
  *     per card, on the card's own record.
  *
- * ## The spec supplies none of it
+ * ## What the spec supplies, and what it cannot
  *
- * On the installed spec, `grouping` and `conditionalFormatting` are
- * `z.unknown().optional()` — exactly like `filter` and `sort` — so the contract
- * constrains the value not at all and cannot be the thing a member pin compares
- * against. `data` is `z.array(z.unknown())` and `cardFields` is
- * `z.array(z.string())`: those fix the CONTAINER kind and, for `cardFields`,
- * the member kind, but neither says anything about what the board does with a
- * member. For all four the read site is the whole of the member contract.
+ * On the installed spec, `conditionalFormatting` is `z.unknown().optional()`,
+ * so the contract constrains its value not at all. `grouping` is TYPED: the
+ * row holds the list view's own `GroupingConfigSchema` by reference, which
+ * fixes the SHAPE of the block (`{ fields: [{ field, order?, collapsed? }] }`,
+ * closed, at least one entry) and which both faces of `@object-ui/types` judge
+ * the key by since objectui#11216. It does not say WHICH position this board
+ * reads — the schema is the list view's, whose grid reads every entry — so the
+ * `[0]` rows below are still the only statement of that. `data` is
+ * `z.array(z.unknown())` and `cardFields` is `z.array(z.string())`: those fix
+ * the CONTAINER kind and, for `cardFields`, the member kind, but neither says
+ * anything about what the board does with a member. For all four, what the
+ * board does with a member is the read site's alone.
  *
  * ## Non-vacuity
  *
 
@@ -59,12 +59,19 @@
  *
  * Read off `ComponentPropsMap['object-kanban']` on the installed spec: `data`
  * is `z.array(z.unknown()).optional()`, `cardFields` is
- * `z.array(z.string()).optional()`, and `grouping` and `conditionalFormatting`
- * are BOTH `z.unknown().optional()` — exactly like `filter` and `sort`. So for
- * two of the four the contract fixes the container kind and nothing about a
- * member, and for the other two it constrains nothing at all. That is why row 4
- * is a key verdict and why the member file exists: on these keys the read site
- * is the whole of the member contract.
+ * `z.array(z.string()).optional()` and `conditionalFormatting` is
+ * `z.unknown().optional()`. `grouping` is TYPED: the row holds the list view's
+ * own `GroupingConfigSchema` by reference (`{ fields: [{ field, order?,
+ * collapsed? }] }`, closed, at least one entry), and both faces of
+ * `@object-ui/types` judge the key by that same schema since objectui#11216 —
+ * re-derived per run by `object-kanban-grouping-typed-11216.test.ts` in that
+ * package rather than by this sentence. So the contract fixes the container
+ * kind of `data` and `cardFields`, constrains `conditionalFormatting` not at
+ * all, and fixes the SHAPE of `grouping` — but for none of the four does it say
+ * which member this board reads (`grouping`'s schema is the list view's, whose
+ * grid reads every entry; this board reads `fields[0].field` only). That is why
+ * row 4 is a key verdict and why the member file exists: what the board does
+ * with a member is the read site's alone.
  */
 
 import { describe, it, expect } from 'vitest';
 
@@ -68,6 +68,7 @@ import {
   ListViewSchema,
   ObjectGridBlockSchema,
   ObjectGallerySchema,
+  ObjectKanbanSchema,
   ObjectViewSchema,
   StrictAnyComponentSchema,
   safeValidateSchema,
@@ -148,6 +149,15 @@ const DECLARING: Readonly<Record<string, DeclaringArm>> = {
     doc: (fields) => ({ type: 'object-grid', properties: { objectName: 'account', grouping: { fields } } }),
     fieldPath: (i) => ['properties', 'grouping', 'fields', i, 'field'],
   },
+  // objectui#11216: the `object-kanban` arm declares `grouping` (the fallback
+  // `ObjectKanban` reads for `swimlaneField`) as the spec's
+  // `GroupingConfigSchema` by reference, the type its spec row gives the key.
+  'object-kanban': {
+    declaredAt: 'grouping',
+    arm: ObjectKanbanSchema,
+    doc: (fields) => ({ type: 'object-kanban', objectName: 'account', groupBy: 'status', grouping: { fields } }),
+    fieldPath: (i) => ['grouping', 'fields', i, 'field'],
+  },
 };
 
 /**
Original file line number	Diff line number	Diff line change
@@ -1010,6 +1010,7 @@ A drag-and-drop Kanban board. The `object-kanban` type key validates the shape t
`1010`	`1010`	\| `titleField` \| `string` \| Field used as the card title. \|
`1011`	`1011`	\| `cardFields` \| `string[]` \| Fields rendered on each card. \|
`1012`	`1012`	\| `swimlaneField` \| `string` \| Record field that splits the board into horizontal swimlanes, across the `groupBy` columns. Declared on both faces since objectui#11355, with the type `@objectstack/spec`'s `object-kanban` row gives it. With the key absent the board falls back to `grouping.fields[0].field`. \|
	`1013`	+\| `grouping` \| `GroupingConfig` \| The fallback for `swimlaneField`: with that key absent, the board splits into swimlanes by `grouping.fields[0].field`, and reads nothing else in the block. The type is `@objectstack/spec`'s `GroupingConfig` (`{ fields: [{ field, order?, collapsed? }] }`), the one the `object-kanban` row and `object-grid` take, by reference on both faces since objectui#11216: at least one entry, no undeclared key, and a `field` written without leading or trailing spaces. \|
`1013`	`1014`	\| `filter` \| `any[]` \| Query filter, forwarded verbatim as `$filter`. \|
`1014`	`1015`	\| `limit` \| `number` \| Fetch window for the board (default 100). \|
`1015`	`1016`	\| `coverImageField` \| `string` \| Field whose URL renders as the card cover image. \|
@@ -1024,7 +1025,7 @@ A drag-and-drop Kanban board. The `object-kanban` type key validates the shape t
`1024`	`1025`	`>`
`1025`	`1026`	> ⚠️ The bare-string array applies only to a board with no `groupBy`. It is declared so this package does not refuse an authoring the protocol allows. The renderer reads a bare-string lane list only when a board has no `groupBy` — so on a board that does declare one the strings are ignored and the lanes come from the group field's picklist options or from the data. Since objectui#8990 made `groupBy` optional, a lane-less board is a valid authoring and this arm is live on it: the lanes are drawn, titled by the raw strings (a grouped board titles its lanes with the picklist labels instead). ⚠️ Such a board holds no cards — with no lane key the records are never distributed — and dragging a card writes nothing back. It is lane headings, not a populated board; to control the lanes of a working board, declare `groupBy` and write the `{ id, title }` array.
`1026`	`1027`	`>`
`1027`		-> Of the other keys the retired `kanban` arm alone declared, `cardTitle` (objectui#9606), `navigation` (objectui#8652) and `swimlaneField` (objectui#11355) are declared on this face; `grouping` is still undeclared. The renderer reads it as the fallback for `swimlaneField`, so a board may carry it; it is simply not judged. Aligning it with the spec's typed row is objectui#11216.
	`1028`	+> Of the other keys the retired `kanban` arm alone declared, `cardTitle` (objectui#9606), `navigation` (objectui#8652), `swimlaneField` (objectui#11355) and `grouping` (objectui#11216) are declared on this face. `grouping` was the last of them: until objectui#11216 it was kept unjudged here and refused by name on the strict authoring face.
`1028`	`1029`
`1029`	`1030`	> Handler keys are not authorable in JSON, and all three now say so by name. Since objectui#7804 this face declares `onCardClick` as an objectui#6124 runtime slot: a React host supplies the function through the TypeScript interface or as a React prop, and this validator refuses the key by name with a message pointing at the node-type spelling (`{ "type": "toast", … }`, an `action:button` node). Until then an authored `onCardClick: { "action": "toast" }` parsed green — `BaseSchema` is `.passthrough()`, so a key no arm declares is not refused, it stops being judged and the value is kept, then reaches a call site expecting a function. ⭐ The other two keys are tombstones, not runtime slots, so their TypeScript twins are `?: never` rather than callable. `onCardMove` has been one since objectui#9342: an authored one reached nothing even as a function, because an object-bound board substitutes its own mover, and the mover lives on `KanbanRenderer`'s React prop of the same name, a sibling of its `schema`. `onQuickAdd` has been one since objectui#11234: a supplied one reached the board and was never called, because its partner `quickAdd` is retired here. `ObjectKanban` renders an internal board that takes the Quick Add pair only as explicit props and supplies neither half; the pair lives on `KanbanRenderer`'s `schema`, for a React host.
`1030`	`1031`