{
  "version": 3,
  "sources": ["../../src/tabs/use-track-overflow.ts"],
  "sourcesContent": ["/* eslint-disable jsdoc/require-param */\n/**\n * WordPress dependencies\n */\nimport { useState, useEffect } from '@wordpress/element';\nimport { useEvent } from '@wordpress/compose';\n\n/**\n * Tracks if an element contains overflow and on which end by tracking the\n * first and last child elements with an `IntersectionObserver` in relation\n * to the parent element.\n *\n * Note that the returned value will only indicate whether the first or last\n * element is currently \"going out of bounds\" but not whether it happens on\n * the X or Y axis.\n */\nexport function useTrackOverflow(parent, children) {\n  const [first, setFirst] = useState(false);\n  const [last, setLast] = useState(false);\n  const [observer, setObserver] = useState();\n  const callback = useEvent(entries => {\n    for (const entry of entries) {\n      if (entry.target === children.first) {\n        setFirst(!entry.isIntersecting);\n      }\n      if (entry.target === children.last) {\n        setLast(!entry.isIntersecting);\n      }\n    }\n  });\n  useEffect(() => {\n    if (!parent || !window.IntersectionObserver) {\n      return;\n    }\n    const newObserver = new IntersectionObserver(callback, {\n      root: parent,\n      threshold: 0.9\n    });\n    setObserver(newObserver);\n    return () => newObserver.disconnect();\n  }, [callback, parent]);\n  useEffect(() => {\n    if (!observer) {\n      return;\n    }\n    if (children.first) {\n      observer.observe(children.first);\n    }\n    if (children.last) {\n      observer.observe(children.last);\n    }\n    return () => {\n      if (children.first) {\n        observer.unobserve(children.first);\n      }\n      if (children.last) {\n        observer.unobserve(children.last);\n      }\n    };\n  }, [children.first, children.last, observer]);\n  return {\n    first,\n    last\n  };\n}\n/* eslint-enable jsdoc/require-param */"],
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