{
  "version": 3,
  "sources": ["../src/useSize.ts", "../src/observe.ts", "../src/size.ts"],
  "sourcesContent": ["import { RefCallback, useCallback, useLayoutEffect, useState } from 'react';\n\nimport { Listener, observe } from './observe';\nimport { Size, updateSizeFromRect } from './size';\n\ntype Result<E> = [RefCallback<E>, Size, E | null];\n\nconst defaultSize: Size = {\n  width: 0,\n  height: 0,\n};\n\nexport function useSize<E extends Element = Element>(initialSize: Size = defaultSize): Result<E> {\n  const [target, setTarget] = useState<E | null>(null);\n  const [size, setSize] = useState(initialSize);\n\n  const handleRect = useCallback<Listener>((next) => {\n    setSize((current) => updateSizeFromRect(current, next));\n  }, []);\n\n  useLayoutEffect(() => {\n    if (target == null) {\n      return;\n    }\n\n    handleRect(target.getBoundingClientRect());\n\n    let didUnsubscribe = false;\n\n    const handleResize = (rect: DOMRect) => {\n      if (didUnsubscribe) {\n        return;\n      }\n\n      handleRect(rect);\n    };\n\n    const unsubscribe = observe(target, handleResize);\n\n    return () => {\n      didUnsubscribe = true;\n\n      unsubscribe();\n    };\n  }, [target, handleRect]);\n\n  return [setTarget, size, target];\n}\n", "export type Listener = (rect: DOMRect) => void;\n\n// region Listeners\n\nconst allListeners = new WeakMap<Element, Listener[]>();\n\nlet isTicking = false;\n\nconst queue = new Map<Element, DOMRect>();\n\nfunction flushQueue() {\n  for (const [target, rect] of queue.entries()) {\n    const listeners = allListeners.get(target);\n\n    if (listeners == null) {\n      continue;\n    }\n\n    for (const listener of listeners) {\n      listener(rect);\n    }\n  }\n\n  queue.clear();\n\n  isTicking = false;\n}\n\nfunction onResize(entries: ResizeObserverEntry[]) {\n  for (const entry of entries) {\n    queue.set(entry.target, entry.contentRect);\n  }\n\n  if (!isTicking) {\n    requestAnimationFrame(flushQueue);\n  }\n\n  isTicking = true;\n}\n\n// endregion\n\n// region Observer\n\nlet observer: ResizeObserver | null = null;\n\nfunction getObserver(): ResizeObserver {\n  observer ??= new ResizeObserver(onResize);\n\n  return observer;\n}\n\n// endregion\n\n// region Observe\n\nfunction unobserve(target: Element, listener: Listener) {\n  const listeners = allListeners.get(target) ?? [];\n\n  if (listeners.length === 1) {\n    getObserver().unobserve(target);\n\n    allListeners.delete(target);\n\n    return;\n  }\n\n  const nextListeners = listeners.filter((it) => it === listener);\n\n  allListeners.set(target, nextListeners);\n}\n\nexport function observe(target: Element, listener: Listener): () => void {\n  getObserver().observe(target);\n\n  const listeners = allListeners.get(target) ?? [];\n\n  listeners.push(listener);\n\n  allListeners.set(target, listeners);\n\n  return () => {\n    unobserve(target, listener);\n  };\n}\n\n// endregion\n", "export type Size = {\n  height: number;\n  width: number;\n};\n\nfunction rectToSize({ height, width }: DOMRect) {\n  return {\n    height: Math.round(height),\n    width: Math.round(width),\n  };\n}\n\nfunction areEqual(left: Size, right: Size) {\n  return left.height === right.height && left.width === right.width;\n}\n\nexport function updateSizeFromRect(current: Size, rect: DOMRect): Size {\n  const next = rectToSize(rect);\n\n  return areEqual(current, next) ? current : next;\n}\n"],
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