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Probably it is used in SSR.';\n\nconst NOT_SUPPORTED_MESSAGE = ''\n  + 'Your browser does not support IntersectionObserver!\\n'\n  + 'Get a polyfill from here:\\n'\n  + 'https://github.com/w3c/IntersectionObserver/tree/master/polyfill';\n\n/**\n * Default options\n */\nlet options = {\n  rootMargin: '0% 50%',\n  threshold: 0.5,\n  animateClassName: 'sal-animate',\n  disabledClassName: 'sal-disabled',\n  enterEventName: 'sal:in',\n  exitEventName: 'sal:out',\n  selector: '[data-sal]',\n  once: true,\n  disabled: false,\n};\n\n/**\n * Private\n */\nlet elements = [];\nlet intersectionObserver = null;\n\n/**\n * Set options\n * @param {Object} settings\n */\nconst setOptions = (settings) => {\n  if (settings && settings !== options) {\n    options = {\n      ...options,\n      ...settings,\n    };\n  }\n};\n\n/**\n * Clear animation for given element\n * @param {HTMLElement} element\n */\nconst clearAnimation = (element) => {\n  element.classList.remove(options.animateClassName);\n};\n\n/**\n * Dispatches the animate event on the intersection observer entry.\n * @param {IntersectionObserverEntry} detail The entry to fire event on.\n */\nconst fireEvent = (name, entry) => {\n  const event = new CustomEvent(name, {\n    bubbles: true,\n    detail: entry,\n  });\n\n  entry.target.dispatchEvent(event);\n};\n\n/**\n * Launch animation by adding class\n * @param {IntersectionObserverEntry} entry\n */\nconst animate = (entry) => {\n  entry.target.classList.add(options.animateClassName);\n  fireEvent(options.enterEventName, entry);\n};\n\n/**\n * Reverse animation by removing class\n * @param {IntersectionObserverEntry} entry\n */\nconst reverse = (entry) => {\n  clearAnimation(entry.target);\n  fireEvent(options.exitEventName, entry);\n};\n\n/**\n * Check if element was animated\n * @param {HTMLElement} element\n */\nconst isAnimated = (element) => (\n  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target.dataset.salRepeat !== undefined;\n    const hasOnceFlag = target.dataset.salOnce !== undefined;\n    const shouldRepeat = hasRepeatFlag || !(hasOnceFlag || options.once);\n\n    if (entry.intersectionRatio >= options.threshold) {\n      animate(entry);\n\n      if (!shouldRepeat) {\n        observer.unobserve(target);\n      }\n    } else if (shouldRepeat) {\n      reverse(entry);\n    }\n  });\n};\n\n/**\n * Disable sal\n */\nconst disable = () => {\n  disableAnimations();\n  clearObserver();\n};\n\n/**\n * Enable sal by launching new IntersectionObserver\n */\nconst enable = () => {\n  enableAnimations();\n\n  intersectionObserver = new IntersectionObserver(onIntersection, {\n    rootMargin: options.rootMargin,\n    threshold: options.threshold,\n  });\n\n  elements = [].filter.call(\n    document.querySelectorAll(options.selector),\n    (element) => !isAnimated(element, options.animateClassName),\n  );\n\n  elements.forEach((element) => 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