{
  "version": 3,
  "sources": ["../src/modules/intersect.js"],
  "sourcesContent": ["// zelvior-runtime/intersect -- one shared IntersectionObserver per distinct\n// rootMargin, fanning out to many callbacks, instead of one instance per\n// watched element (the pattern most lazy-load libraries use, and the\n// dominant real cost on element-heavy low-end pages). Falls back to a\n// throttled scroll/resize rect check when IntersectionObserver is\n// unavailable. ESM source of truth; bundled by build.mjs.\n\nvar hasIO = typeof window !== 'undefined' && typeof window.IntersectionObserver === 'function';\n\nvar observers = {}; // rootMargin -> IntersectionObserver\nvar callbacks = (typeof WeakMap === 'function') ? new WeakMap() : null;\nvar fallbackEls = [];\nvar fallbackTimer = null;\n\nfunction key(margin) { return margin || '0px'; }\n\nfunction handleEntries(entries) {\n  for (var i = 0; i < entries.length; i++) {\n    var e = entries[i];\n    var cbs = callbacks && callbacks.get(e.target);\n    if (cbs) for (var j = 0; j < cbs.length; j++) { try { cbs[j](e.isIntersecting, e); } catch (err) {} }\n  }\n}\n\nfunction fallbackCheck() {\n  fallbackTimer = null;\n  var vh = window.innerHeight || document.documentElement.clientHeight;\n  var vw = window.innerWidth || document.documentElement.clientWidth;\n  for (var i = 0; i < fallbackEls.length; i++) {\n    var el = fallbackEls[i];\n    var r = el.getBoundingClientRect();\n    var visible = r.top <= vh + 50 && r.bottom >= -50 && r.left <= vw + 50 && r.right >= -50;\n    var cbs = callbacks && callbacks.get(el);\n    if (cbs) for (var j = 0; j < cbs.length; j++) { try { cbs[j](visible, { target: el, isIntersecting: visible }); } catch (err) {} }\n  }\n}\nfunction scheduleFallback() {\n  if (fallbackTimer) return;\n  fallbackTimer = setTimeout(fallbackCheck, 100);\n}\n\n/** Watch `el`; `cb(isIntersecting, entry)` may be called many times, shared across watchers using the same rootMargin. Returns an unwatch function. */\nexport function onIntersect(el, cb, opts) {\n  if (!callbacks) callbacks = new WeakMap();\n  var cbs = callbacks.get(el);\n  if (!cbs) { cbs = []; callbacks.set(el, cbs); }\n  cbs.push(cb);\n\n  var margin = opts && opts.rootMargin;\n  if (hasIO) {\n    var k = key(margin);\n    var obs = observers[k];\n    if (!obs) { obs = new IntersectionObserver(handleEntries, { rootMargin: k }); observers[k] = obs; }\n    obs.observe(el);\n  } else {\n    if (fallbackEls.indexOf(el) === -1) fallbackEls.push(el);\n    if (typeof window !== 'undefined' && !window.__zelvior_io_fallback__) {\n      window.__zelvior_io_fallback__ = true;\n      window.addEventListener('scroll', scheduleFallback, { passive: true });\n      window.addEventListener('resize', scheduleFallback, { passive: true });\n    }\n    scheduleFallback();\n  }\n\n  return function unwatch() {\n    var arr = callbacks.get(el);\n    if (arr) {\n      var idx = arr.indexOf(cb);\n      if (idx > -1) arr.splice(idx, 1);\n      if (!arr.length) {\n        if (hasIO) { var obs2 = observers[key(margin)]; if (obs2) obs2.unobserve(el); }\n        var fi = fallbackEls.indexOf(el);\n        if (fi > -1) fallbackEls.splice(fi, 1);\n      }\n    }\n  };\n}\n\nexport var supported = hasIO;\n"],
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  "names": ["intersect_exports", "__export", "onIntersect", "supported", "__toCommonJS", "hasIO", "observers", "callbacks", "fallbackEls", "fallbackTimer", "key", "margin", "handleEntries", "entries", "i", "e", "cbs", "j", "err", "fallbackCheck", "vh", "vw", "el", "visible", "scheduleFallback", "cb", "opts", "k", "obs", "arr", "idx", "obs2", "fi"]
}