@@ -0,0 +1,12 @@
+---
+'@object-ui/plugin-grid': patch
+---
+
+refactor(plugin-grid): `ObjectGrid`'s module-level helpers move into sibling modules
+
+Clause-②: no
+Metadata-protocol: none
+
+The query helpers (the held filter resolution, the record-source ladder, the find-params signature), the column helpers and column emit types, the record-link cell, the English fallback translations, the display defaults (row height, page sizes, selection default) and the row-version helpers move verbatim out of `ObjectGrid.tsx` into six modules beside it. No logic, name or rendered output changes. `ObjectGrid.tsx` re-exports every name it exported before, and the package entry is unchanged.
+
+What to do: nothing.
@@ -1 +1 @@
-{"package":"ui/packages/plugin-grid","sources":38,"sha256":"f6f7b1cbd89a1536a6e33febf4db131b8d526bd7281be460c401dccb8e97876a","manifestSha256":"1f6e1ccb925a678eaa393f9091dfc7d0285e4e3626e0a5c61a5474687debabb7"}
+{"package":"ui/packages/plugin-grid","sources":44,"sha256":"afbc05964d76c725b0d533f1bd28b1515591d0748eca468158f64fc3bb7f7a80","manifestSha256":"1f6e1ccb925a678eaa393f9091dfc7d0285e4e3626e0a5c61a5474687debabb7"}
@@ -0,0 +1,207 @@
+/**
+ * The display defaults of `ObjectGrid` (`./ObjectGrid.tsx`): the row-height
+ * resolver, the page sizes, the selection default and the no-refusal
+ * grouping signature, moved out of that file verbatim (objectstack#25994,
+ * slice 1).
+ */
+
+import { PaginationConfigSchema } from '@objectstack/spec/ui';
+import { ROW_HEIGHT_TO_DENSITY_MODE } from '@object-ui/core';
+
+/** The row heights this grid styles — the five `RowHeight` values the spec admits. */
+export type RowHeightMode = 'compact' | 'short' | 'medium' | 'tall' | 'extra_tall';
+
+/**
+ * The ONE answer this component gives for a `rowHeight` it does not recognize
+ * (objectui#4443).
+ *
+ * The seed used to be `schema.rowHeight ?? 'compact'`, which made the component
+ * answer the same question two ways: an ABSENT `rowHeight` landed on `compact`,
+ * an OFF-SPEC one fell through the density ternaries below to their terminal
+ * `else` — the `medium` styling. That is the absent-vs-off-spec split #4440
+ * removed from `ListView`, and a third answer to a question `@object-ui/core`
+ * (`rowHeightToDensityMode`, which abstains) and the `@object-ui/react` spec
+ * bridge (#4352, which abstains) had already settled. One metadata-driven
+ * system, one answer: off-spec renders exactly like absent.
+ *
+ * The ternary chains are deliberately NOT touched — `medium` is a real value
+ * with its own arm, and a leaf renderer's terminal `else` is legitimate styling.
+ * Narrowing happens here, at the boundary, so nothing off-spec ever reaches it.
+ *
+ * Membership is tested against `ROW_HEIGHT_TO_DENSITY_MODE` rather than a local
+ * list so the admitted values have one definition in the repo; that table is
+ * typed `Record<RowHeight, DensityMode>`, so the build fails if the spec grows a
+ * sixth row height and this resolver is not taught about it.
+ *
+ * `hasOwnProperty`, not `in`: `in` walks the prototype chain, so `'toString'`
+ * would come back admitted. That is not hypothetical here — the toolbar's icon
+ * map is looked up by the same key, and a prototype member reached
+ * `Object.prototype.toString` and rendered it as a React component, while a
+ * plain off-spec value produced `undefined` and threw outright.
+ */
+export function resolveRowHeightMode(rowHeight: unknown): RowHeightMode {
+  if (typeof rowHeight !== 'string') return 'compact';
+  if (!Object.prototype.hasOwnProperty.call(ROW_HEIGHT_TO_DENSITY_MODE, rowHeight)) return 'compact';
+  return rowHeight as RowHeightMode;
+}
+
+/**
+ * The page size every display surface of this component falls back to when the
+ * author declared none (objectui#9853, rulings 5749197629 and 5824040487): the
+ * flat table, the server-paged table, the grouped view's page of groups, and a
+ * server-grouped leaf's page of rows. Wherever there is a pager, this is its
+ * page.
+ *
+ * READ from `@objectstack/spec`, not restated. The protocol's pagination config
+ * declares `pageSize` with a default, and that declaration is the one answer an
+ * author can look up; a literal here would be a second answer free to drift
+ * from it. Parsing an empty object is the spec's own way of saying what an
+ * undeclared member means, so this is the value the schema would fill in.
+ *
+ * ⚠️ There is deliberately no local fallback number behind this read. If a
+ * future `@objectstack/spec` stops declaring the default (the same principle
+ * `packages/types` applies at its own import boundary is that a validator does
+ * not write values), this throws at module load instead of quietly
+ * substituting a number nobody declared. The spec version is locked, so that
+ * can only surface on a spec upgrade, where the pin
+ * `ObjectGrid.displayPageSizeDefault-9853.test.tsx` reddens first.
+ */
+function readSpecDisplayPageSize(): number {
+  const declared: unknown = PaginationConfigSchema.parse({}).pageSize;
+  if (typeof declared !== 'number' || !Number.isInteger(declared) || declared <= 0) {
+    throw new Error(
+      '[ObjectUI] ObjectGrid: @objectstack/spec no longer declares a positive default '
+      + `for pagination.pageSize (read ${String(declared)}); the grid has no display `
+      + 'page size to fall back to.',
+    );
+  }
+  return declared;
+}
+export const DEFAULT_DISPLAY_PAGE_SIZE = readSpecDisplayPageSize();
+
+/**
+ * How many rows this grid FETCHES when it buckets a window into groups in the
+ * browser and the author declared no page size (`bucketsFetchedWindow`). A
+ * fetch batch, ⛔ not a page size: no display path reads it, and it does not
+ * follow the display default (objectui#9853, ruling 5824040487, structure B).
+ * Before ruling 5749197629 this number was named as a "server window" and also
+ * sized the server-paged table's visible page, so one constant meant two
+ * quantities.
+ *
+ * It stays a constant of this component rather than the protocol's value
+ * because the protocol declares no fetch batch: it is how much of the result
+ * set a client-grouped view holds, which is an implementation choice.
+ */
+export const DEFAULT_FETCH_BATCH_SIZE = 50;
+
+/**
+ * The mode a `selection` object with no `type` member asks for (objectui#9837,
+ * ruling A-prime: presence enables, an explicit off wins).
+ *
+ * ⚠️ Derived, not chosen freely. The ruling's first clause is that writing the
+ * object turns selection ON, so the only values that satisfy it are the two
+ * enabling ones — and `'multiple'` is already this renderer's own answer to
+ * "selection is on, nothing said which kind": it is what the bulk-action
+ * auto-enable arm resolves to, and what the legacy `selectable: true` means
+ * (`packages/types/src/data-display.ts`, "boolean: Enable/disable selection
+ * (true = multiple selection)"). `'single'` would be a third, unstated opinion.
+ *
+ * ⚠️ `@objectstack/spec`'s own `SelectionConfigSchema` declares `type` with
+ * `.default('none')`, which this constant deliberately does NOT follow: honouring
+ * it would make a written object mean OFF and contradict the ruling's first
+ * clause outright. It is reachable only through a PARSE, and this repo's mirror
+ * strips imported defaults at the import boundary
+ * (`packages/types/src/zod/imported-defaults.ts`), so an omitted `type` stays
+ * omitted on the way to this read — but metadata parsed by the spec bundle
+ * itself arrives carrying `type: 'none'` and is then an EXPLICIT off here.
+ * Handed back as a question on objectui#9837 rather than decided here.
+ */
+export const DEFAULT_SELECTION_TYPE = 'multiple' as const;
+
+/**
+ * The ONE resolver for an authored page size, for the reason the `rowHeight`
+ * resolver just above exists: one resolver at every entry is what keeps the
+ * answer single (objectui#4443).
+ *
+ * Before objectui#9853 this value was spelled out separately at each of its
+ * three read points, and the spellings disagreed about a non-positive number:
+ * the flat site used `||`, so `0` was falsy and fell through to a default,
+ * while both seeds used `??`, so `0` was not nullish and survived as a real
+ * page size. It then divided the grouped pager and reached the wire as
+ * `$top: 0`, so the grid asked the server for nothing and drew an empty table
+ * — with no error, no warning and no empty state naming the cause.
+ *
+ * ## Why refusing `0` is not this renderer inventing a meaning
+ *
+ * `@objectstack/spec` has already answered what a `pageSize` of `0` means.
+ * Its pagination config declares the member as a POSITIVE integer with a
+ * default, and the spec's own suite pins that refusal under the names
+ * `should reject zero pageSize` and `should reject negative pageSize`. The
+ * `limit` that this block's `ElementDataSourceMapping` lowers
+ * `pagination.pageSize` into is declared positive as well. So `0` is not a
+ * spelling whose meaning a consumer may choose; it is a value the contract
+ * refuses, and a renderer that quietly divides by it is the only party not
+ * saying so.
+ *
+ * ⚠️ The refusal is FAIL-SOFT on purpose. Throwing would take out the whole
+ * subtree for a declaration the flat path already tolerated, which is a worse
+ * outcome than the defect. The value is dropped, the site's own default is
+ * used, and `describeNonPositivePageSize` states it once through the channel
+ * this component already uses for "you declared it, the renderer dropped it".
+ *
+ * Reads the canonical key first and the deprecated flat shorthand second, in
+ * that precedence, with `??` so an explicit `0` is SEEN by the guard instead
+ * of skipped by falsiness — that skipping is the defect, not the fix.
+ */
+function readAuthoredPageSize(schema: {
+  pagination?: unknown;
+  pageSize?: unknown;
+}): unknown {
+  const fromObject = (schema.pagination as { pageSize?: unknown } | undefined)?.pageSize;
+  return fromObject ?? schema.pageSize;
+}
+
+function isUsablePageSize(value: unknown): value is number {
+  return typeof value === 'number' && Number.isInteger(value) && value > 0;
+}
+
+export function resolvePageSize(
+  schema: { pagination?: unknown; pageSize?: unknown },
+  fallback: number,
+): number {
+  const authored = readAuthoredPageSize(schema);
+  return isUsablePageSize(authored) ? authored : fallback;
+}
+
+/**
+ * The diagnostic half. `null` means "nothing to say" — an absent key is not a
+ * mistake, and a usable page size is not either, so the message is CONDITIONAL
+ * and a control asserting its silence is what keeps it from being an
+ * always-on marker that states nothing.
+ */
+export function describeNonPositivePageSize(
+  schema: { pagination?: unknown; pageSize?: unknown },
+  context: { blockType?: unknown; objectName?: unknown },
+): string | null {
+  const authored = readAuthoredPageSize(schema);
+  if (authored === undefined || authored === null) return null;
+  if (isUsablePageSize(authored)) return null;
+  const where = [
+    typeof context.blockType === 'string' ? context.blockType : 'object-grid',
+    typeof context.objectName === 'string' ? context.objectName : undefined,
+  ]
+    .filter(Boolean)
+    .join(' on ');
+  return (
+    `[ObjectUI] ObjectGrid pagination: ${where} declared pageSize: ${String(authored)}, `
+    + 'which is not a positive integer. A page size must be a positive integer '
+    + '(the spec refuses zero and negative values), so it was ignored and this '
+    + 'grid fell back to its default page size.'
+  );
+}
+
+/**
+ * The grouping-refusal signature when no entry is refused (objectui#10583,
+ * objectui#10657): the authored grouping config is then handed on as it is.
+ */
+export const NO_GROUPING_REFUSAL = JSON.stringify({ refused: [], warned: [] });
Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-{"package":"ui/packages/plugin-grid","sources":38,"sha256":"f6f7b1cbd89a1536a6e33febf4db131b8d526bd7281be460c401dccb8e97876a","manifestSha256":"1f6e1ccb925a678eaa393f9091dfc7d0285e4e3626e0a5c61a5474687debabb7"}`
	`1`	`+{"package":"ui/packages/plugin-grid","sources":44,"sha256":"afbc05964d76c725b0d533f1bd28b1515591d0748eca468158f64fc3bb7f7a80","manifestSha256":"1f6e1ccb925a678eaa393f9091dfc7d0285e4e3626e0a5c61a5474687debabb7"}`