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`${prefix}-${id}` : id;\n}\n","import { useCallback, useRef, useState } from \"react\";\n\nexport interface NodeRect {\n x: number;\n y: number;\n width: number;\n height: number;\n}\n\ninterface UseNodeRegistryReturn {\n registerNode: (id: string, rect: NodeRect) => void;\n unregisterNode: (id: string) => void;\n nodeRects: Map;\n version: number;\n}\n\nexport function useNodeRegistry(): UseNodeRegistryReturn {\n const rectsRef = useRef(new Map());\n const [version, setVersion] = useState(0);\n\n const registerNode = useCallback((id: string, rect: NodeRect) => {\n rectsRef.current.set(id, rect);\n setVersion((v) => v + 1);\n }, []);\n\n const unregisterNode = useCallback((id: string) => {\n rectsRef.current.delete(id);\n setVersion((v) => v + 1);\n }, []);\n\n return { registerNode, unregisterNode, nodeRects: rectsRef.current, version };\n}\n","/**\n * Light / dark / **system** theming.\n *\n * `styles.css` in this package defines the dark contract — it redefines the\n * whole `--color-secondary-*` scale under `:where(.dark)` so that \"900\" always\n * means strongest foreground and \"50\" always means faintest surface. This module\n * is the other half of that contract: the thing that decides when `.dark` is on.\n *\n * It lives here rather than in each app because every consumer was hand-rolling\n * it, and every hand-rolled copy had the same two holes:\n *\n * - **No live listener.** The OS preference was read once at boot, so changing\n * the system theme with the page open did nothing. That is a default, not a\n * \"system\" mode.\n * - **No way back.** Choosing light or dark wrote to storage forever, so\n * \"follow my system\" was unreachable after a single click.\n *\n * Both are fixed by treating **\"system\" as the absence of a stored choice**\n * rather than as a third stored value.\n *\n * Every export is safe to call during SSR, where it is a no-op that resolves to\n * `\"light\"`. Pair it with `useTheme`, which deliberately renders `system/light`\n * on the server and syncs in an effect — this project has paid for hydration\n * mismatches caused by reading the real theme during render.\n */\n\nexport type ThemePreference = \"light\" | \"dark\" | \"system\";\nexport type ResolvedTheme = \"light\" | \"dark\";\n\n/**\n * Deliberately the key the showcase already used, so adopting this module keeps\n * a returning visitor's saved choice instead of silently resetting it.\n */\nexport const THEME_STORAGE_KEY = \"fancy-ui.theme\";\n\nconst DARK_QUERY = \"(prefers-color-scheme: dark)\";\n\ntype ThemeListener = (resolved: ResolvedTheme, preference: ThemePreference) => void;\n\nconst listeners = new Set();\nlet storageKey = THEME_STORAGE_KEY;\nlet stopWatchingSystem: (() => void) | null = null;\n\nfunction canUseDom(): boolean {\n return typeof window !== \"undefined\" && typeof document !== \"undefined\";\n}\n\n/** The stored choice, or `\"system\"` when there isn't one. */\nexport function getThemePreference(): ThemePreference {\n if (!canUseDom()) return \"system\";\n try {\n const saved = window.localStorage.getItem(storageKey);\n return saved === \"light\" || saved === \"dark\" ? saved : \"system\";\n } catch {\n // Private browsing and blocked storage both throw here. A theme is not\n // worth taking the page down over.\n return \"system\";\n }\n}\n\nfunction systemTheme(): ResolvedTheme {\n if (!canUseDom() || typeof window.matchMedia !== \"function\") return \"light\";\n return window.matchMedia(DARK_QUERY).matches ? \"dark\" : \"light\";\n}\n\n/** What is actually on screen, as opposed to what the user asked for. */\nexport function resolveTheme(preference: ThemePreference = getThemePreference()): ResolvedTheme {\n return preference === \"system\" ? systemTheme() : preference;\n}\n\nfunction applyToDocument(resolved: ResolvedTheme): void {\n if (!canUseDom()) return;\n const root = document.documentElement;\n // The class is what this package's CSS keys off; the attribute is for\n // consumers whose own styles key off `[data-theme]`.\n root.classList.toggle(\"dark\", resolved === \"dark\");\n root.setAttribute(\"data-theme\", resolved);\n}\n\nfunction publish(): void {\n const preference = getThemePreference();\n const resolved = resolveTheme(preference);\n applyToDocument(resolved);\n listeners.forEach((listener) => listener(resolved, preference));\n}\n\n/**\n * Choose a theme. `\"system\"` REMOVES the stored value rather than storing the\n * string — an absent choice is what lets the OS keep speaking for the user.\n */\nexport function setThemePreference(preference: ThemePreference): void {\n if (canUseDom()) {\n try {\n if (preference === \"system\") {\n window.localStorage.removeItem(storageKey);\n } else {\n window.localStorage.setItem(storageKey, preference);\n }\n } catch {\n // As above: still apply it for this page even if it cannot persist.\n }\n }\n publish();\n}\n\n/** Observe theme changes. Returns an unsubscribe. */\nexport function subscribeTheme(listener: ThemeListener): () => void {\n listeners.add(listener);\n return () => {\n listeners.delete(listener);\n };\n}\n\n/**\n * Apply the current theme and start following the OS. Call once, as early as\n * possible — before first paint if you want to avoid a flash of the wrong\n * theme. Returns a disposer; calling it again is harmless.\n */\nexport function initTheme(options: { storageKey?: string } = {}): () => void {\n if (options.storageKey) storageKey = options.storageKey;\n if (!canUseDom()) return () => {};\n\n applyToDocument(resolveTheme());\n\n if (!stopWatchingSystem && typeof window.matchMedia === \"function\") {\n const media = window.matchMedia(DARK_QUERY);\n const onSystemChange = (): void => {\n // Only \"system\" follows the OS. An explicit choice has to survive\n // the user switching their OS theme, or it isn't a choice.\n if (getThemePreference() === \"system\") publish();\n };\n\n if (typeof media.addEventListener === \"function\") {\n media.addEventListener(\"change\", onSystemChange);\n stopWatchingSystem = () => media.removeEventListener(\"change\", onSystemChange);\n } else {\n // Safari < 14 and friends.\n media.addListener(onSystemChange);\n stopWatchingSystem = () => media.removeListener(onSystemChange);\n }\n }\n\n return () => {\n stopWatchingSystem?.();\n stopWatchingSystem = null;\n };\n}\n","import { useCallback, useEffect, useState } from \"react\";\nimport {\n getThemePreference,\n resolveTheme,\n setThemePreference,\n subscribeTheme,\n type ResolvedTheme,\n type ThemePreference,\n} from \"../theme\";\n\nexport type UseThemeResult = {\n /** What the user asked for, including `\"system\"`. */\n preference: ThemePreference;\n /** What is actually on screen. */\n resolved: ResolvedTheme;\n setPreference: (preference: ThemePreference) => void;\n};\n\n/**\n * Read and set the theme from a component, re-rendering when it changes —\n * including when the OS theme changes underneath a `\"system\"` preference.\n *\n * The initial state is deliberately `system` / `light` rather than the real\n * theme: the server has neither storage nor an OS preference, so reading the\n * truth during render is exactly the hydration mismatch this project has\n * already chased down more than once. The effect syncs immediately on mount.\n */\nexport function useTheme(): UseThemeResult {\n const [state, setState] = useState<{ preference: ThemePreference; resolved: ResolvedTheme }>({\n preference: \"system\",\n resolved: \"light\",\n });\n\n useEffect(() => {\n const sync = (): void => {\n setState({ preference: getThemePreference(), resolved: resolveTheme() });\n };\n sync();\n return subscribeTheme(sync);\n }, []);\n\n const setPreference = useCallback((preference: ThemePreference): void => {\n setThemePreference(preference);\n }, []);\n\n return { ...state, setPreference };\n}\n"]}