tethysfaceid/.next/cache/next-babel-loader/2dd58b14d80b7a285872a6106515cd49.json

{"ast":null,"code":"\"use strict\";\n\nvar _interopRequireDefault = require(\"@babel/runtime/helpers/interopRequireDefault\");\n\nexports.__esModule = true;\nexports.useIntersection = useIntersection;\n\nvar _react = require(\"react\");\n\nvar _requestIdleCallback = _interopRequireDefault(require(\"./request-idle-callback\"));\n\nconst hasIntersectionObserver = typeof IntersectionObserver !== 'undefined';\n\nfunction useIntersection({\n  rootMargin,\n  disabled\n}) {\n  const isDisabled = disabled || !hasIntersectionObserver;\n  const unobserve = (0, _react.useRef)();\n  const [visible, setVisible] = (0, _react.useState)(false);\n  const setRef = (0, _react.useCallback)(el => {\n    if (unobserve.current) {\n      unobserve.current();\n      unobserve.current = undefined;\n    }\n\n    if (isDisabled || visible) return;\n\n    if (el && el.tagName) {\n      unobserve.current = observe(el, isVisible => isVisible && setVisible(isVisible), {\n        rootMargin\n      });\n    }\n  }, [isDisabled, rootMargin, visible]);\n  (0, _react.useEffect)(() => {\n    if (!hasIntersectionObserver) {\n      if (!visible) (0, _requestIdleCallback.default)(() => setVisible(true));\n    }\n  }, [visible]);\n  return [setRef, visible];\n}\n\nfunction observe(element, callback, options) {\n  const {\n    id,\n    observer,\n    elements\n  } = createObserver(options);\n  elements.set(element, callback);\n  observer.observe(element);\n  return function unobserve() {\n    observer.unobserve(element); // Destroy observer when there's nothing left to watch:\n\n    if (elements.size === 0) {\n      observer.disconnect();\n      observers.delete(id);\n    }\n  };\n}\n\nconst observers = new Map();\n\nfunction createObserver(options) {\n  const id = options.rootMargin || '';\n  let instance = observers.get(id);\n\n  if (instance) {\n    return instance;\n  }\n\n  const elements = new Map();\n  const observer = new IntersectionObserver(entries => {\n    entries.forEach(entry => {\n      const callback = elements.get(entry.target);\n      const isVisible = entry.isIntersecting || entry.intersectionRatio > 0;\n\n      if (callback && isVisible) {\n        callback(isVisible);\n      }\n    });\n  }, options);\n  observers.set(id, instance = {\n    id,\n    observer,\n    elements\n  });\n  return instance;\n}","map":null,"metadata":{},"sourceType":"script"}