feat(joint-react): add declarative layers with initialLayers, controlled layers, useLayers and useLayer

.changeset/layers-graph-provider.md

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+---
+"@joint/react": minor
+---
+
+<GraphProvider /> - add `initialLayers`, controlled `layers` and `onLayersChange`

.changeset/layers-mvc.md

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+---
+"@joint/react": minor
+---
+
+LayerModel - add the layer model preset registered for plain graph layers

.changeset/layers-namespace.md

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+---
+"@joint/react": minor
+---
+
+<GraphProvider /> - add `layerNamespace` prop to register custom layer types

.changeset/layers-record.md

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+---
+"@joint/react": minor
+---
+
+LayerRecord - add the layer record type; `visible: false` hides a layer without unmounting its cells

.changeset/layers-setters.md

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+---
+"@joint/react": minor
+---
+
+useGraph - add `setLayers()` and `setLayer()` to declare, reorder, update and hide layers

.changeset/layers-use-layer.md

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+---
+"@joint/react": minor
+---
+
+useLayer - add a hook reading one layer by id with an optional selector

.changeset/layers-use-layers.md

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+---
+"@joint/react": minor
+---
+
+useLayers - add a hook returning the graph's layers in paint order, generic over the layer id union

.changeset/layers-view.md

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+---
+"@joint/react": minor
+---
+
+LayerView - add the layer view preset that applies a layer's `visible` attribute

.changeset/react-layer-callback-commit.md

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+---
+"@joint/react": patch
+---
+
+<GraphProvider /> - refresh layer callbacks before descendant layout effects

packages/joint-react/src/components/graph/__tests__/controlled-layer-pruning.test.tsx

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+import { act, render, waitFor } from '@testing-library/react';
+import { GraphProvider } from '../graph-provider';
+import { useGraphStore } from '../../../hooks/use-graph-store';
+import { useGraph } from '../../../hooks/use-graph';
+import type { GraphStore } from '../../../store';
+import type { CellRecord, ElementRecord } from '../../../types/cell.types';
+import type { LayerRecord } from '../../../types/layer.types';
+import { ELEMENT_MODEL_TYPE } from '../../../mvc/element-model';
+
+const element = (layer: string) => ({
+  id: 'node',
+  type: ELEMENT_MODEL_TYPE,
+  layer,
+  position: { x: 0, y: 0 },
+  size: { width: 10, height: 10 },
+} satisfies ElementRecord);
+const INITIAL_LAYERS: readonly LayerRecord[] = [{ id: 'notes' }];
+const REMAINING_LAYERS: readonly LayerRecord[] = [];
+const INITIAL_CELLS: readonly CellRecord[] = [element('notes')];
+const MOVED_CELLS: readonly CellRecord[] = [element('cells')];
+const NO_CELLS: readonly CellRecord[] = [];
+interface Captured { store?: GraphStore; api?: ReturnType<typeof useGraph> }
+function Capture({ captured }: Readonly<{ captured: Captured }>) {
+  captured.store = useGraphStore();
+  captured.api = useGraph();
+  return null;
+}
+
+it.each(['move', 'delete'] as const)('prunes a retained layer after a controlled cells-only %s with the same layers array', async (mode) => {
+  const captured: Captured = {};
+  const onLayersChange = jest.fn();
+  const warn = jest.spyOn(console, 'warn').mockImplementation(jest.fn());
+  const tree = (cells: readonly CellRecord[], layers: readonly LayerRecord[]) => (
+    <GraphProvider cells={cells} layers={layers} onLayersChange={onLayersChange}>
+      <Capture captured={captured} />
+    </GraphProvider>
+  );
+  const view = render(tree(INITIAL_CELLS, INITIAL_LAYERS));
+  try {
+    await waitFor(() => expect(captured.store?.graph.hasLayer('notes')).toBe(true));
+    onLayersChange.mockClear();
+    await act(async () => {
+      view.rerender(tree(INITIAL_CELLS, REMAINING_LAYERS));
+    });
+    expect(captured.store?.graph.hasLayer('notes')).toBe(true);
+
+    await act(async () => {
+      view.rerender(tree(mode === 'move' ? MOVED_CELLS : NO_CELLS, REMAINING_LAYERS));
+    });
+
+    if (mode === 'move') expect(captured.store?.graph.getCell('node').get('layer')).toBe('cells');
+    else expect(captured.store?.graph.getCell('node')).toBeUndefined();
+    expect(captured.store?.graph.hasLayer('notes')).toBe(false);
+    expect(captured.store?.graphProjection.layers.getLayer('notes')).toBeUndefined();
+    expect(onLayersChange).not.toHaveBeenCalled();
+  } finally {
+    view.unmount();
+    warn.mockRestore();
+  }
+});
+
+it.each(['api move', 'native move', 'native delete'] as const)(
+  'prunes a retained controlled layer after an uncontrolled %s without a parent update',
+  async (mode) => {
+    const captured: Captured = {};
+    const warn = jest.spyOn(console, 'warn').mockImplementation(jest.fn());
+    const tree = (layers: readonly LayerRecord[]) => (
+      <GraphProvider initialCells={INITIAL_CELLS} layers={layers}>
+        <Capture captured={captured} />
+      </GraphProvider>
+    );
+    const view = render(tree(INITIAL_LAYERS));
+    try {
+      await waitFor(() => expect(captured.store?.graph.hasLayer('notes')).toBe(true));
+      await act(async () => {
+        view.rerender(tree(REMAINING_LAYERS));
+      });
+      const { store, api } = captured;
+      if (!store || !api) throw new Error('graph not ready');
+      expect(store.graph.hasLayer('notes')).toBe(true);
+
+      await act(async () => {
+        if (mode === 'api move') api.setCell(element('cells'));
+        else if (mode === 'native move') store.graph.getCell('node').layer('cells');
+        else store.graph.removeCells([store.graph.getCell('node')]);
+        await new Promise<void>((resolve) => queueMicrotask(resolve));
+      });
+
+      expect(store.graph.hasLayer('notes')).toBe(false);
+      expect(store.graphProjection.layers.getLayer('notes')).toBeUndefined();
+      if (mode === 'native delete') expect(store.graph.getCell('node')).toBeUndefined();
+      else expect(store.graph.getCell('node').layer()).toBe('cells');
+    } finally {
+      view.unmount();
+      warn.mockRestore();
+    }
+  }
+);

packages/joint-react/src/components/graph/__tests__/graph-provider-layer-lifecycle.test.tsx

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+import { dia } from '@joint/core';
+import { act, render } from '@testing-library/react';
+import { useLayoutEffect } from 'react';
+import { GraphProvider } from '../graph-provider';
+import { useGraph } from '../../../hooks/use-graph';
+import type { GraphApi } from '../../../hooks/use-graph';
+import type { LayerRecord } from '../../../types/layer.types';
+
+const UPDATED_LAYERS = [{ id: 'cells' }, { id: 'notes', name: 'Updated' }];
+const INITIAL_LAYERS: readonly LayerRecord[] = [{ id: 'cells' }, { id: 'notes' }];
+
+function MountMutation({ mutate }: { readonly mutate: (api: GraphApi) => void }) {
+  const api = useGraph();
+  useLayoutEffect(() => {
+    mutate(api);
+  }, [api, mutate]);
+  return null;
+}
+
+const hideNotes = (api: GraphApi) => api.setLayer('notes', { visible: false });
+const addLayer = (api: GraphApi) => {
+  if (!api.graph.hasLayer('child')) api.graph.addLayer({ id: 'child' });
+};
+
+describe('GraphProvider layer subscription ownership', () => {
+  it.each([
+    ['setLayer', hideNotes, { id: 'notes', visible: false }],
+    ['graph.addLayer', addLayer, { id: 'child' }],
+  ] as const)('reports %s from a child mount layout effect', (_name, mutate, expected) => {
+    const onLayersChange = jest.fn();
+    render(
+      <GraphProvider initialLayers={INITIAL_LAYERS} onLayersChange={onLayersChange}>
+        <MountMutation mutate={mutate} />
+      </GraphProvider>
+    );
+
+    expect(onLayersChange).toHaveBeenCalledTimes(1);
+    expect(onLayersChange).toHaveBeenLastCalledWith(expect.arrayContaining([expected]));
+  });
+
+  it('restores controlled layers changed by a child mount layout effect without a handler', async () => {
+    const graph = new dia.Graph();
+    render(
+      <GraphProvider graph={graph} layers={INITIAL_LAYERS}>
+        <MountMutation mutate={hideNotes} />
+      </GraphProvider>
+    );
+
+    await act(async () => {
+      await Promise.resolve();
+    });
+    expect(graph.getLayer('notes').get('visible')).not.toBe(false);
+  });
+
+  it('does not revert external graph layers after the provider unmounts', async () => {
+    const graph = new dia.Graph();
+    const { unmount } = render(<GraphProvider graph={graph} layers={INITIAL_LAYERS} />);
+
+    act(() => {
+      graph.getLayer('notes').set('visible', false);
+    });
+    expect(graph.getLayer('notes').get('visible')).toBe(false);
+    unmount();
+
+    await act(async () => {
+      await Promise.resolve();
+    });
+    expect(graph.getLayer('notes').get('visible')).toBe(false);
+  });
+
+  it('uses the latest callback and does not echo controlled prop updates', () => {
+    const graph = new dia.Graph();
+    const initialHandler = jest.fn();
+    const nextHandler = jest.fn();
+    const { rerender } = render(
+      <GraphProvider graph={graph} layers={INITIAL_LAYERS} onLayersChange={initialHandler} />
+    );
+
+    rerender(<GraphProvider graph={graph} layers={UPDATED_LAYERS} onLayersChange={nextHandler} />);
+    expect(initialHandler).not.toHaveBeenCalled();
+    expect(nextHandler).not.toHaveBeenCalled();
+
+    act(() => {
+      graph.getLayer('notes').set('visible', false);
+    });
+    expect(initialHandler).not.toHaveBeenCalled();
+    expect(nextHandler).toHaveBeenCalledTimes(1);
+    expect(nextHandler).toHaveBeenLastCalledWith(
+      expect.arrayContaining([{ id: 'notes', name: 'Updated', visible: false }])
+    );
+  });
+});
+
+
+function CommitLayerChange({ visible }: { readonly visible: boolean }) {
+  const { setLayer } = useGraph();
+  useLayoutEffect(() => { setLayer('notes', { visible }); }, [setLayer, visible]);
+  return null;
+}
+
+it('uses the replacement handler for a child layout-effect write in the same commit', () => {
+  const oldHandler = jest.fn();
+  const nextHandler = jest.fn();
+  const { rerender } = render(
+    <GraphProvider initialLayers={INITIAL_LAYERS} onLayersChange={oldHandler}>
+      <CommitLayerChange visible />
+    </GraphProvider>
+  );
+  oldHandler.mockClear();
+  rerender(
+    <GraphProvider initialLayers={INITIAL_LAYERS} onLayersChange={nextHandler}>
+      <CommitLayerChange visible={false} />
+    </GraphProvider>
+  );
+  expect(oldHandler).not.toHaveBeenCalled();
+  expect(nextHandler).toHaveBeenCalledTimes(1);
+  expect(nextHandler).toHaveBeenLastCalledWith(
+    expect.arrayContaining([{ id: 'notes', visible: false }])
+  );
+});