one/dist/esm/link/prefetchIntent.native.js

One is a new React Framework that makes Vite serve both native and web.

function createPrefetchIntent(options) {
  var {
    onPrefetch,
    maxReach = 500,
    perpWeight = 5,
    minSpeed = 8
  } = options;
  var done = /* @__PURE__ */new Set();
  var rects = [];
  var px = 0,
    py = 0,
    vx = 0,
    vy = 0;
  var moveCount = 0;
  var lastPrefetchMove = 0;
  function setRects(newRects) {
    rects = newRects.filter(function (r) {
      return !done.has(r.h);
    });
  }
  function move(x, y, dx, dy) {
    moveCount++;
    var smooth = moveCount < 3 ? 0.3 : 0.6;
    vx = vx * smooth + dx * (1 - smooth);
    vy = vy * smooth + dy * (1 - smooth);
    px = x;
    py = y;
    var speed = Math.sqrt(vx * vx + vy * vy);
    if (speed < minSpeed) return;
    var ux = vx / speed;
    var uy = vy / speed;
    var best = Infinity;
    var href = "";
    var _iteratorNormalCompletion = true,
      _didIteratorError = false,
      _iteratorError = void 0;
    try {
      for (var _iterator = rects[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
        var {
          r,
          h
        } = _step.value;
        var cx = (r.left + r.right) / 2 - px;
        var cy = (r.top + r.bottom) / 2 - py;
        var dist = Math.sqrt(cx * cx + cy * cy);
        var along = cx * ux + cy * uy;
        if (along < 0) continue;
        var perpX = cx - along * ux;
        var perpY = cy - along * uy;
        var perp = Math.sqrt(perpX * perpX + perpY * perpY);
        var baseRadius = Math.max(r.width, r.height) / 2 + 30;
        var distanceFactor = Math.max(0.2, 1 - dist / 1e3);
        var radius = baseRadius * distanceFactor + 20;
        if (perp > radius) continue;
        var score = along + perp * perpWeight;
        if (score < best) {
          best = score;
          href = h;
        }
      }
    } catch (err) {
      _didIteratorError = true;
      _iteratorError = err;
    } finally {
      try {
        if (!_iteratorNormalCompletion && _iterator.return != null) {
          _iterator.return();
        }
      } finally {
        if (_didIteratorError) {
          throw _iteratorError;
        }
      }
    }
    if (href && best < maxReach && moveCount - lastPrefetchMove > 1) {
      done.add(href);
      rects = rects.filter(function (r2) {
        return r2.h !== href;
      });
      lastPrefetchMove = moveCount;
      onPrefetch(href);
    }
  }
  var nodes = /* @__PURE__ */new Map();
  function observe(el, href) {
    nodes.set(el, href);
    return function () {
      nodes.delete(el);
      done.delete(href);
    };
  }
  return {
    setRects,
    move,
    observe,
    nodes,
    done
  };
}
var instance = null;
var started = false;
function startPrefetchIntent(onPrefetch) {
  if (started) return instance;
  started = true;
  instance = createPrefetchIntent({
    onPrefetch
  });
  var frame = 0;
  var px = 0,
    py = 0;
  function measure() {
    if (!instance.nodes.size) return setTimeout(measure, 300);
    var io = new IntersectionObserver(function (entries) {
      io.disconnect();
      instance.setRects(entries.filter(function (e) {
        return e.isIntersecting;
      }).map(function (e) {
        return {
          r: e.boundingClientRect,
          h: instance.nodes.get(e.target)
        };
      }).filter(function (x) {
        return x.h;
      }));
      setTimeout(measure, 300);
    });
    instance.nodes.forEach(function (_, el) {
      return io.observe(el);
    });
  }
  measure();
  document.addEventListener("mousemove", function (e) {
    if (++frame % 4) return;
    var dx = e.clientX - px;
    var dy = e.clientY - py;
    px = e.clientX;
    py = e.clientY;
    instance.move(px, py, dx, dy);
  }, {
    passive: true
  });
  return instance;
}
function observePrefetchIntent(el, href) {
  if (!instance) return function () {};
  return instance.observe(el, href);
}
export { createPrefetchIntent, observePrefetchIntent, startPrefetchIntent };
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