@tldraw/editor/dist-esm/lib/TldrawEditor.mjs.map

tldraw infinite canvas SDK (editor).

{
  "version": 3,
  "sources": ["../../src/lib/TldrawEditor.tsx"],
  "sourcesContent": ["import { MigrationSequence, Store } from '@tldraw/store'\nimport { TLShape, TLStore, TLStoreSnapshot } from '@tldraw/tlschema'\nimport { Required, annotateError } from '@tldraw/utils'\nimport React, {\n\tReactNode,\n\tmemo,\n\tuseCallback,\n\tuseEffect,\n\tuseLayoutEffect,\n\tuseMemo,\n\tuseRef,\n\tuseState,\n\tuseSyncExternalStore,\n} from 'react'\n\nimport classNames from 'classnames'\nimport { version } from '../version'\nimport { OptionalErrorBoundary } from './components/ErrorBoundary'\nimport { DefaultErrorFallback } from './components/default-components/DefaultErrorFallback'\nimport { TLEditorSnapshot } from './config/TLEditorSnapshot'\nimport { TLStoreBaseOptions } from './config/createTLStore'\nimport { TLUser, createTLUser } from './config/createTLUser'\nimport { TLAnyBindingUtilConstructor } from './config/defaultBindings'\nimport { TLAnyShapeUtilConstructor } from './config/defaultShapes'\nimport { Editor } from './editor/Editor'\nimport { TLStateNodeConstructor } from './editor/tools/StateNode'\nimport { TLCameraOptions } from './editor/types/misc-types'\nimport { ContainerProvider, useContainer } from './hooks/useContainer'\nimport { useCursor } from './hooks/useCursor'\nimport { useDarkMode } from './hooks/useDarkMode'\nimport { EditorProvider, useEditor } from './hooks/useEditor'\nimport {\n\tEditorComponentsProvider,\n\tTLEditorComponents,\n\tuseEditorComponents,\n} from './hooks/useEditorComponents'\nimport { useEvent } from './hooks/useEvent'\nimport { useForceUpdate } from './hooks/useForceUpdate'\nimport { useShallowObjectIdentity } from './hooks/useIdentity'\nimport { useLocalStore } from './hooks/useLocalStore'\nimport { useRefState } from './hooks/useRefState'\nimport { useZoomCss } from './hooks/useZoomCss'\nimport { LicenseProvider } from './license/LicenseProvider'\nimport { Watermark } from './license/Watermark'\nimport { TldrawOptions } from './options'\nimport { TLDeepLinkOptions } from './utils/deepLinks'\nimport { stopEventPropagation } from './utils/dom'\nimport { TLTextOptions } from './utils/richText'\nimport { TLStoreWithStatus } from './utils/sync/StoreWithStatus'\n\n/**\n * Props for the {@link tldraw#Tldraw} and {@link TldrawEditor} components, when passing in a\n * `TLStore` directly. If you would like tldraw to create a store for you, use\n * {@link TldrawEditorWithoutStoreProps}.\n *\n * @public\n */\nexport interface TldrawEditorWithStoreProps {\n\t/**\n\t * The store to use in the editor.\n\t */\n\tstore: TLStore | TLStoreWithStatus\n}\n\n/**\n * Props for the {@link tldraw#Tldraw} and {@link TldrawEditor} components, when not passing in a\n * `TLStore` directly. If you would like to pass in a store directly, use\n * {@link TldrawEditorWithStoreProps}.\n *\n * @public\n */\nexport interface TldrawEditorWithoutStoreProps extends TLStoreBaseOptions {\n\tstore?: undefined\n\n\t/**\n\t * Additional migrations to use in the store\n\t */\n\tmigrations?: readonly MigrationSequence[]\n\n\t/**\n\t * A starting snapshot of data to pre-populate the store. Do not supply both this and\n\t * `initialData`.\n\t */\n\tsnapshot?: TLEditorSnapshot | TLStoreSnapshot\n\n\t/**\n\t * If you would like to persist the store to the browser's local IndexedDB storage and sync it\n\t * across tabs, provide a key here. Each key represents a single tldraw document.\n\t */\n\tpersistenceKey?: string\n\n\tsessionId?: string\n}\n\n/** @public */\nexport type TldrawEditorStoreProps = TldrawEditorWithStoreProps | TldrawEditorWithoutStoreProps\n\n/**\n * Props for the {@link tldraw#Tldraw} and {@link TldrawEditor} components.\n *\n * @public\n **/\nexport type TldrawEditorProps = TldrawEditorBaseProps & TldrawEditorStoreProps\n\n/**\n * Base props for the {@link tldraw#Tldraw} and {@link TldrawEditor} components.\n *\n * @public\n */\nexport interface TldrawEditorBaseProps {\n\t/**\n\t * The component's children.\n\t */\n\tchildren?: ReactNode\n\n\t/**\n\t * An array of shape utils to use in the editor.\n\t */\n\tshapeUtils?: readonly TLAnyShapeUtilConstructor[]\n\n\t/**\n\t * An array of binding utils to use in the editor.\n\t */\n\tbindingUtils?: readonly TLAnyBindingUtilConstructor[]\n\n\t/**\n\t * An array of tools to add to the editor's state chart.\n\t */\n\ttools?: readonly TLStateNodeConstructor[]\n\n\t/**\n\t * Whether to automatically focus the editor when it mounts.\n\t */\n\tautoFocus?: boolean\n\n\t/**\n\t * Overrides for the editor's components, such as handles, collaborator cursors, etc.\n\t */\n\tcomponents?: TLEditorComponents\n\n\t/**\n\t * Called when the editor has mounted.\n\t */\n\tonMount?: TLOnMountHandler\n\n\t/**\n\t * The editor's initial state (usually the id of the first active tool).\n\t */\n\tinitialState?: string\n\n\t/**\n\t * A classname to pass to the editor's container.\n\t */\n\tclassName?: string\n\n\t/**\n\t * The user interacting with the editor.\n\t */\n\tuser?: TLUser\n\n\t/**\n\t * Whether to infer dark mode from the user's OS. Defaults to false.\n\t */\n\tinferDarkMode?: boolean\n\n\t/**\n\t * Camera options for the editor.\n\t */\n\tcameraOptions?: Partial<TLCameraOptions>\n\n\t/**\n\t * Text options for the editor.\n\t */\n\ttextOptions?: TLTextOptions\n\n\t/**\n\t * Options for the editor.\n\t */\n\toptions?: Partial<TldrawOptions>\n\n\t/**\n\t * The license key.\n\t */\n\tlicenseKey?: string\n\n\t/**\n\t * Options for syncing the editor's camera state with the URL.\n\t */\n\tdeepLinks?: true | TLDeepLinkOptions\n\n\t/**\n\t * Predicate for whether or not a shape should be hidden.\n\t *\n\t * @deprecated Use {@link TldrawEditorBaseProps#getShapeVisibility} instead.\n\t */\n\tisShapeHidden?(shape: TLShape, editor: Editor): boolean\n\n\t/**\n\t * Provides a way to hide shapes.\n\t *\n\t * Hidden shapes will not render in the editor, and they will not be eligible for hit test via\n\t * {@link Editor#getShapeAtPoint} and {@link Editor#getShapesAtPoint}. But otherwise they will\n\t * remain in the store and participate in all other operations.\n\t *\n\t * @example\n\t * ```ts\n\t * getShapeVisibility={(shape, editor) => shape.meta.hidden ? 'hidden' : 'inherit'}\n\t * ```\n\t *\n\t * - `'inherit' | undefined` - (default) The shape will be visible unless its parent is hidden.\n\t * - `'hidden'` - The shape will be hidden.\n\t * - `'visible'` - The shape will be visible.\n\t *\n\t * @param shape - The shape to check.\n\t * @param editor - The editor instance.\n\t */\n\tgetShapeVisibility?(\n\t\tshape: TLShape,\n\t\teditor: Editor\n\t): 'visible' | 'hidden' | 'inherit' | null | undefined\n\n\t/**\n\t * The URLs for the fonts to use in the editor.\n\t */\n\tassetUrls?: { fonts?: { [key: string]: string | undefined } }\n}\n\n/**\n * Called when the editor has mounted.\n * @example\n * ```ts\n * <Tldraw onMount={(editor) => editor.selectAll()} />\n * ```\n * @param editor - The editor instance.\n *\n * @public\n */\nexport type TLOnMountHandler = (editor: Editor) => (() => void | undefined) | undefined | void\n\ndeclare global {\n\tinterface Window {\n\t\ttldrawReady: boolean\n\t}\n}\n\nconst EMPTY_SHAPE_UTILS_ARRAY = [] as const\nconst EMPTY_BINDING_UTILS_ARRAY = [] as const\nconst EMPTY_TOOLS_ARRAY = [] as const\n/** @internal */\nexport const TL_CONTAINER_CLASS = 'tl-container'\n\n/** @public @react */\nexport const TldrawEditor = memo(function TldrawEditor({\n\tstore,\n\tcomponents,\n\tclassName,\n\tuser: _user,\n\toptions: _options,\n\t...rest\n}: TldrawEditorProps) {\n\tconst [container, setContainer] = useState<HTMLElement | null>(null)\n\tconst user = useMemo(() => _user ?? createTLUser(), [_user])\n\n\tconst ErrorFallback =\n\t\tcomponents?.ErrorFallback === undefined ? DefaultErrorFallback : components?.ErrorFallback\n\n\t// apply defaults. if you're using the bare @tldraw/editor package, we\n\t// default these to the \"tldraw zero\" configuration. We have different\n\t// defaults applied in tldraw.\n\tconst withDefaults = {\n\t\t...rest,\n\t\tshapeUtils: rest.shapeUtils ?? EMPTY_SHAPE_UTILS_ARRAY,\n\t\tbindingUtils: rest.bindingUtils ?? EMPTY_BINDING_UTILS_ARRAY,\n\t\ttools: rest.tools ?? EMPTY_TOOLS_ARRAY,\n\t\tcomponents,\n\t\toptions: useShallowObjectIdentity(_options),\n\t}\n\n\treturn (\n\t\t<div\n\t\t\tref={setContainer}\n\t\t\tdata-tldraw={version}\n\t\t\tdraggable={false}\n\t\t\tclassName={classNames(`${TL_CONTAINER_CLASS} tl-theme__light`, className)}\n\t\t\tonPointerDown={stopEventPropagation}\n\t\t\ttabIndex={-1}\n\t\t\trole=\"application\"\n\t\t\taria-label={_options?.branding ?? 'tldraw'}\n\t\t>\n\t\t\t<OptionalErrorBoundary\n\t\t\t\tfallback={ErrorFallback}\n\t\t\t\tonError={(error) => annotateError(error, { tags: { origin: 'react.tldraw-before-app' } })}\n\t\t\t>\n\t\t\t\t{container && (\n\t\t\t\t\t<LicenseProvider licenseKey={rest.licenseKey}>\n\t\t\t\t\t\t<ContainerProvider container={container}>\n\t\t\t\t\t\t\t<EditorComponentsProvider overrides={components}>\n\t\t\t\t\t\t\t\t{store ? (\n\t\t\t\t\t\t\t\t\tstore instanceof Store ? (\n\t\t\t\t\t\t\t\t\t\t// Store is ready to go, whether externally synced or not\n\t\t\t\t\t\t\t\t\t\t<TldrawEditorWithReadyStore {...withDefaults} store={store} user={user} />\n\t\t\t\t\t\t\t\t\t) : (\n\t\t\t\t\t\t\t\t\t\t// Store is a synced store, so handle syncing stages internally\n\t\t\t\t\t\t\t\t\t\t<TldrawEditorWithLoadingStore {...withDefaults} store={store} user={user} />\n\t\t\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\t\t) : (\n\t\t\t\t\t\t\t\t\t// We have no store (it's undefined) so create one and possibly sync it\n\t\t\t\t\t\t\t\t\t<TldrawEditorWithOwnStore {...withDefaults} store={store} user={user} />\n\t\t\t\t\t\t\t\t)}\n\t\t\t\t\t\t\t</EditorComponentsProvider>\n\t\t\t\t\t\t</ContainerProvider>\n\t\t\t\t\t</LicenseProvider>\n\t\t\t\t)}\n\t\t\t</OptionalErrorBoundary>\n\t\t</div>\n\t)\n})\n\nfunction TldrawEditorWithOwnStore(\n\tprops: Required<\n\t\tTldrawEditorProps & { store: undefined; user: TLUser },\n\t\t'shapeUtils' | 'bindingUtils' | 'tools'\n\t>\n) {\n\tconst {\n\t\tdefaultName,\n\t\tsnapshot,\n\t\tinitialData,\n\t\tshapeUtils,\n\t\tbindingUtils,\n\t\tpersistenceKey,\n\t\tsessionId,\n\t\tuser,\n\t\tassets,\n\t\tmigrations,\n\t} = props\n\n\tconst syncedStore = useLocalStore({\n\t\tshapeUtils,\n\t\tbindingUtils,\n\t\tinitialData,\n\t\tpersistenceKey,\n\t\tsessionId,\n\t\tdefaultName,\n\t\tsnapshot,\n\t\tassets,\n\t\tmigrations,\n\t})\n\n\treturn <TldrawEditorWithLoadingStore {...props} store={syncedStore} user={user} />\n}\n\nconst TldrawEditorWithLoadingStore = memo(function TldrawEditorBeforeLoading({\n\tstore,\n\tuser,\n\t...rest\n}: Required<\n\tTldrawEditorProps & { store: TLStoreWithStatus; user: TLUser },\n\t'shapeUtils' | 'bindingUtils' | 'tools'\n>) {\n\tconst container = useContainer()\n\n\tuseLayoutEffect(() => {\n\t\tif (user.userPreferences.get().colorScheme === 'dark') {\n\t\t\tcontainer.classList.remove('tl-theme__light')\n\t\t\tcontainer.classList.add('tl-theme__dark')\n\t\t}\n\t}, [container, user])\n\n\tconst { LoadingScreen } = useEditorComponents()\n\n\tswitch (store.status) {\n\t\tcase 'error': {\n\t\t\t// for error handling, we fall back to the default error boundary.\n\t\t\t// if users want to handle this error differently, they can render\n\t\t\t// their own error screen before the TldrawEditor component\n\t\t\tthrow store.error\n\t\t}\n\t\tcase 'loading': {\n\t\t\treturn LoadingScreen ? <LoadingScreen /> : null\n\t\t}\n\t\tcase 'not-synced': {\n\t\t\tbreak\n\t\t}\n\t\tcase 'synced-local': {\n\t\t\tbreak\n\t\t}\n\t\tcase 'synced-remote': {\n\t\t\tbreak\n\t\t}\n\t}\n\n\treturn <TldrawEditorWithReadyStore {...rest} store={store.store} user={user} />\n})\n\nconst noAutoFocus = () => document.location.search.includes('tldraw_preserve_focus') // || !document.hasFocus() // breaks in nextjs\n\nfunction TldrawEditorWithReadyStore({\n\tonMount,\n\tchildren,\n\tstore,\n\ttools,\n\tshapeUtils,\n\tbindingUtils,\n\tuser,\n\tinitialState,\n\tautoFocus = true,\n\tinferDarkMode,\n\tcameraOptions,\n\ttextOptions,\n\toptions,\n\tlicenseKey,\n\tdeepLinks: _deepLinks,\n\t// eslint-disable-next-line @typescript-eslint/no-deprecated\n\tisShapeHidden,\n\tgetShapeVisibility,\n\tassetUrls,\n}: Required<\n\tTldrawEditorProps & {\n\t\tstore: TLStore\n\t\tuser: TLUser\n\t},\n\t'shapeUtils' | 'bindingUtils' | 'tools'\n>) {\n\tconst { ErrorFallback } = useEditorComponents()\n\tconst container = useContainer()\n\n\tconst [editor, setEditor] = useRefState<Editor | null>(null)\n\n\tconst canvasRef = useRef<HTMLDivElement | null>(null)\n\n\tconst deepLinks = useShallowObjectIdentity(_deepLinks === true ? {} : _deepLinks)\n\n\t// props in this ref can be changed without causing the editor to be recreated.\n\tconst editorOptionsRef = useRef({\n\t\t// for these, it's because they're only used when the editor first mounts:\n\t\tautoFocus: autoFocus && !noAutoFocus(),\n\t\tinferDarkMode,\n\t\tinitialState,\n\n\t\t// for these, it's because we keep them up to date in a separate effect:\n\t\tcameraOptions,\n\t\tdeepLinks,\n\t})\n\n\tuseLayoutEffect(() => {\n\t\teditorOptionsRef.current = {\n\t\t\tautoFocus: autoFocus && !noAutoFocus(),\n\t\t\tinferDarkMode,\n\t\t\tinitialState,\n\t\t\tcameraOptions,\n\t\t\tdeepLinks,\n\t\t}\n\t}, [autoFocus, inferDarkMode, initialState, cameraOptions, deepLinks])\n\n\tuseLayoutEffect(\n\t\t() => {\n\t\t\tconst { autoFocus, inferDarkMode, initialState, cameraOptions, deepLinks } =\n\t\t\t\teditorOptionsRef.current\n\t\t\tconst editor = new Editor({\n\t\t\t\tstore,\n\t\t\t\tshapeUtils,\n\t\t\t\tbindingUtils,\n\t\t\t\ttools,\n\t\t\t\tgetContainer: () => container,\n\t\t\t\tuser,\n\t\t\t\tinitialState,\n\t\t\t\t// we should check for some kind of query parameter that turns off autofocus\n\t\t\t\tautoFocus,\n\t\t\t\tinferDarkMode,\n\t\t\t\tcameraOptions,\n\t\t\t\ttextOptions,\n\t\t\t\toptions,\n\t\t\t\tlicenseKey,\n\t\t\t\tisShapeHidden,\n\t\t\t\tgetShapeVisibility,\n\t\t\t\tfontAssetUrls: assetUrls?.fonts,\n\t\t\t})\n\n\t\t\teditor.updateViewportScreenBounds(canvasRef.current ?? container)\n\n\t\t\t// Use the ref here because we only want to do this once when the editor is created.\n\t\t\t// We don't want changes to the urlStateSync prop to trigger creating new editors.\n\t\t\tif (deepLinks) {\n\t\t\t\tif (!deepLinks?.getUrl) {\n\t\t\t\t\t// load the state from window.location\n\t\t\t\t\teditor.navigateToDeepLink(deepLinks)\n\t\t\t\t} else {\n\t\t\t\t\t// load the state from the provided URL\n\t\t\t\t\teditor.navigateToDeepLink({ ...deepLinks, url: deepLinks.getUrl(editor) })\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tsetEditor(editor)\n\n\t\t\treturn () => {\n\t\t\t\teditor.dispose()\n\t\t\t}\n\t\t},\n\t\t// if any of these change, we need to recreate the editor.\n\t\t[\n\t\t\tbindingUtils,\n\t\t\tcontainer,\n\t\t\toptions,\n\t\t\tshapeUtils,\n\t\t\tstore,\n\t\t\ttools,\n\t\t\tuser,\n\t\t\tsetEditor,\n\t\t\tlicenseKey,\n\t\t\tisShapeHidden,\n\t\t\tgetShapeVisibility,\n\t\t\ttextOptions,\n\t\t\tassetUrls,\n\t\t]\n\t)\n\n\tuseLayoutEffect(() => {\n\t\tif (!editor) return\n\t\tif (deepLinks) {\n\t\t\treturn editor.registerDeepLinkListener(deepLinks)\n\t\t}\n\t}, [editor, deepLinks])\n\n\t// keep the editor up to date with the latest camera options\n\tuseLayoutEffect(() => {\n\t\tif (editor && cameraOptions) {\n\t\t\teditor.setCameraOptions(cameraOptions)\n\t\t}\n\t}, [editor, cameraOptions])\n\n\tconst crashingError = useSyncExternalStore(\n\t\tuseCallback(\n\t\t\t(onStoreChange) => {\n\t\t\t\tif (editor) {\n\t\t\t\t\teditor.on('crash', onStoreChange)\n\t\t\t\t\treturn () => editor.off('crash', onStoreChange)\n\t\t\t\t}\n\t\t\t\treturn () => {\n\t\t\t\t\t// noop\n\t\t\t\t}\n\t\t\t},\n\t\t\t[editor]\n\t\t),\n\t\t() => editor?.getCrashingError() ?? null\n\t)\n\n\t// For our examples site, we want autoFocus to be true on the examples site, but not\n\t// when embedded in our docs site. If present, the `tldraw_preserve_focus` search param\n\t// overrides the `autoFocus` prop and prevents the editor from focusing immediately,\n\t// however here we also add some logic to focus the editor when the user clicks\n\t// on it and unfocus it when the user clicks away from it.\n\tuseEffect(\n\t\tfunction handleFocusOnPointerDownForPreserveFocusMode() {\n\t\t\tif (!editor) return\n\n\t\t\tfunction handleFocusOnPointerDown() {\n\t\t\t\tif (!editor) return\n\t\t\t\teditor.focus()\n\t\t\t}\n\n\t\t\tfunction handleBlurOnPointerDown() {\n\t\t\t\tif (!editor) return\n\t\t\t\teditor.blur()\n\t\t\t}\n\n\t\t\tif (autoFocus && noAutoFocus()) {\n\t\t\t\teditor.getContainer().addEventListener('pointerdown', handleFocusOnPointerDown)\n\t\t\t\tdocument.body.addEventListener('pointerdown', handleBlurOnPointerDown)\n\n\t\t\t\treturn () => {\n\t\t\t\t\teditor.getContainer()?.removeEventListener('pointerdown', handleFocusOnPointerDown)\n\t\t\t\t\tdocument.body.removeEventListener('pointerdown', handleBlurOnPointerDown)\n\t\t\t\t}\n\t\t\t}\n\t\t},\n\t\t[editor, autoFocus]\n\t)\n\n\tconst [_fontLoadingState, setFontLoadingState] = useState<{\n\t\teditor: Editor\n\t\tisLoaded: boolean\n\t} | null>(null)\n\tlet fontLoadingState = _fontLoadingState\n\tif (editor !== fontLoadingState?.editor) {\n\t\tfontLoadingState = null\n\t}\n\tuseEffect(() => {\n\t\tif (!editor) return\n\t\tlet isCancelled = false\n\n\t\tsetFontLoadingState({ editor, isLoaded: false })\n\n\t\teditor.fonts\n\t\t\t.loadRequiredFontsForCurrentPage(editor.options.maxFontsToLoadBeforeRender)\n\t\t\t.finally(() => {\n\t\t\t\tif (isCancelled) return\n\t\t\t\tsetFontLoadingState({ editor, isLoaded: true })\n\t\t\t})\n\n\t\treturn () => {\n\t\t\tisCancelled = true\n\t\t}\n\t}, [editor])\n\n\tconst { Canvas, LoadingScreen } = useEditorComponents()\n\n\tif (!editor || !fontLoadingState?.isLoaded) {\n\t\treturn (\n\t\t\t<>\n\t\t\t\t{LoadingScreen && <LoadingScreen />}\n\t\t\t\t<div className=\"tl-canvas\" ref={canvasRef} />\n\t\t\t</>\n\t\t)\n\t}\n\n\treturn (\n\t\t// the top-level tldraw component also renders an error boundary almost\n\t\t// identical to this one. the reason we have two is because this one has\n\t\t// access to `App`, which means that here we can enrich errors with data\n\t\t// from app for reporting, and also still attempt to render the user's\n\t\t// document in the event of an error to reassure them that their work is\n\t\t// not lost.\n\t\t<OptionalErrorBoundary\n\t\t\tfallback={ErrorFallback as any}\n\t\t\tonError={(error) =>\n\t\t\t\teditor.annotateError(error, { origin: 'react.tldraw', willCrashApp: true })\n\t\t\t}\n\t\t>\n\t\t\t{crashingError ? (\n\t\t\t\t<Crash crashingError={crashingError} />\n\t\t\t) : (\n\t\t\t\t<EditorProvider editor={editor}>\n\t\t\t\t\t<Layout onMount={onMount}>\n\t\t\t\t\t\t{children ?? (Canvas ? <Canvas key={editor.contextId} /> : null)}\n\t\t\t\t\t\t<Watermark />\n\t\t\t\t\t</Layout>\n\t\t\t\t</EditorProvider>\n\t\t\t)}\n\t\t</OptionalErrorBoundary>\n\t)\n}\n\nfunction Layout({ children, onMount }: { children: ReactNode; onMount?: TLOnMountHandler }) {\n\tuseZoomCss()\n\tuseCursor()\n\tuseDarkMode()\n\tuseForceUpdate()\n\tuseOnMount((editor) => {\n\t\tconst teardownStore = editor.store.props.onMount(editor)\n\t\tconst teardownCallback = onMount?.(editor)\n\n\t\treturn () => {\n\t\t\tteardownStore?.()\n\t\t\tteardownCallback?.()\n\t\t}\n\t})\n\n\treturn children\n}\n\nfunction Crash({ crashingError }: { crashingError: unknown }): null {\n\tthrow crashingError\n}\n\n/** @public */\nexport interface LoadingScreenProps {\n\tchildren: ReactNode\n}\n\n/** @public @react */\nexport function LoadingScreen({ children }: LoadingScreenProps) {\n\treturn (\n\t\t<div className=\"tl-loading\" aria-busy=\"true\" tabIndex={0}>\n\t\t\t{children}\n\t\t</div>\n\t)\n}\n\n/** @public @react */\nexport function ErrorScreen({ children }: LoadingScreenProps) {\n\treturn <div className=\"tl-loading\">{children}</div>\n}\n\n/** @internal */\nexport function useOnMount(onMount?: TLOnMountHandler) {\n\tconst editor = useEditor()\n\n\tconst onMountEvent = useEvent((editor: Editor) => {\n\t\tlet teardown: (() => void) | void = undefined\n\t\t// If the user wants to do something when the editor mounts, we make sure it doesn't effect the history.\n\t\t// todo: is this reeeeally what we want to do, or should we leave it up to the caller?\n\t\teditor.run(\n\t\t\t() => {\n\t\t\t\tteardown = onMount?.(editor)\n\t\t\t\teditor.emit('mount')\n\t\t\t},\n\t\t\t{ history: 'ignore' }\n\t\t)\n\t\twindow.tldrawReady = true\n\t\treturn teardown\n\t})\n\n\tReact.useLayoutEffect(() => {\n\t\tif (editor) return onMountEvent?.(editor)\n\t}, [editor, onMountEvent])\n}\n"],
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}