jtBaseApp/node_modules/.vite/deps/chunk-7ANULLBZ.js

import {
  __commonJS
} from "./chunk-S5KM4IGW.js";

// node_modules/earcut/src/earcut.js
var require_earcut = __commonJS({
  "node_modules/earcut/src/earcut.js"(exports, module) {
    "use strict";
    module.exports = earcut;
    module.exports.default = earcut;
    function earcut(data, holeIndices, dim) {
      dim = dim || 2;
      var hasHoles = holeIndices && holeIndices.length, outerLen = hasHoles ? holeIndices[0] * dim : data.length, outerNode = linkedList(data, 0, outerLen, dim, true), triangles = [];
      if (!outerNode || outerNode.next === outerNode.prev)
        return triangles;
      var minX, minY, maxX, maxY, x, y, invSize;
      if (hasHoles)
        outerNode = eliminateHoles(data, holeIndices, outerNode, dim);
      if (data.length > 80 * dim) {
        minX = maxX = data[0];
        minY = maxY = data[1];
        for (var i = dim; i < outerLen; i += dim) {
          x = data[i];
          y = data[i + 1];
          if (x < minX)
            minX = x;
          if (y < minY)
            minY = y;
          if (x > maxX)
            maxX = x;
          if (y > maxY)
            maxY = y;
        }
        invSize = Math.max(maxX - minX, maxY - minY);
        invSize = invSize !== 0 ? 32767 / invSize : 0;
      }
      earcutLinked(outerNode, triangles, dim, minX, minY, invSize, 0);
      return triangles;
    }
    function linkedList(data, start, end, dim, clockwise) {
      var i, last;
      if (clockwise === signedArea(data, start, end, dim) > 0) {
        for (i = start; i < end; i += dim)
          last = insertNode(i, data[i], data[i + 1], last);
      } else {
        for (i = end - dim; i >= start; i -= dim)
          last = insertNode(i, data[i], data[i + 1], last);
      }
      if (last && equals(last, last.next)) {
        removeNode(last);
        last = last.next;
      }
      return last;
    }
    function filterPoints(start, end) {
      if (!start)
        return start;
      if (!end)
        end = start;
      var p = start, again;
      do {
        again = false;
        if (!p.steiner && (equals(p, p.next) || area(p.prev, p, p.next) === 0)) {
          removeNode(p);
          p = end = p.prev;
          if (p === p.next)
            break;
          again = true;
        } else {
          p = p.next;
        }
      } while (again || p !== end);
      return end;
    }
    function earcutLinked(ear, triangles, dim, minX, minY, invSize, pass) {
      if (!ear)
        return;
      if (!pass && invSize)
        indexCurve(ear, minX, minY, invSize);
      var stop = ear, prev, next;
      while (ear.prev !== ear.next) {
        prev = ear.prev;
        next = ear.next;
        if (invSize ? isEarHashed(ear, minX, minY, invSize) : isEar(ear)) {
          triangles.push(prev.i / dim | 0);
          triangles.push(ear.i / dim | 0);
          triangles.push(next.i / dim | 0);
          removeNode(ear);
          ear = next.next;
          stop = next.next;
          continue;
        }
        ear = next;
        if (ear === stop) {
          if (!pass) {
            earcutLinked(filterPoints(ear), triangles, dim, minX, minY, invSize, 1);
          } else if (pass === 1) {
            ear = cureLocalIntersections(filterPoints(ear), triangles, dim);
            earcutLinked(ear, triangles, dim, minX, minY, invSize, 2);
          } else if (pass === 2) {
            splitEarcut(ear, triangles, dim, minX, minY, invSize);
          }
          break;
        }
      }
    }
    function isEar(ear) {
      var a = ear.prev, b = ear, c = ear.next;
      if (area(a, b, c) >= 0)
        return false;
      var ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y;
      var x0 = ax < bx ? ax < cx ? ax : cx : bx < cx ? bx : cx, y0 = ay < by ? ay < cy ? ay : cy : by < cy ? by : cy, x1 = ax > bx ? ax > cx ? ax : cx : bx > cx ? bx : cx, y1 = ay > by ? ay > cy ? ay : cy : by > cy ? by : cy;
      var p = c.next;
      while (p !== a) {
        if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) && area(p.prev, p, p.next) >= 0)
          return false;
        p = p.next;
      }
      return true;
    }
    function isEarHashed(ear, minX, minY, invSize) {
      var a = ear.prev, b = ear, c = ear.next;
      if (area(a, b, c) >= 0)
        return false;
      var ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y;
      var x0 = ax < bx ? ax < cx ? ax : cx : bx < cx ? bx : cx, y0 = ay < by ? ay < cy ? ay : cy : by < cy ? by : cy, x1 = ax > bx ? ax > cx ? ax : cx : bx > cx ? bx : cx, y1 = ay > by ? ay > cy ? ay : cy : by > cy ? by : cy;
      var minZ = zOrder(x0, y0, minX, minY, invSize), maxZ = zOrder(x1, y1, minX, minY, invSize);
      var p = ear.prevZ, n = ear.nextZ;
      while (p && p.z >= minZ && n && n.z <= maxZ) {
        if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c && pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) && area(p.prev, p, p.next) >= 0)
          return false;
        p = p.prevZ;
        if (n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c && pointInTriangle(ax, ay, bx, by, cx, cy, n.x, n.y) && area(n.prev, n, n.next) >= 0)
          return false;
        n = n.nextZ;
      }
      while (p && p.z >= minZ) {
        if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c && pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) && area(p.prev, p, p.next) >= 0)
          return false;
        p = p.prevZ;
      }
      while (n && n.z <= maxZ) {
        if (n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c && pointInTriangle(ax, ay, bx, by, cx, cy, n.x, n.y) && area(n.prev, n, n.next) >= 0)
          return false;
        n = n.nextZ;
      }
      return true;
    }
    function cureLocalIntersections(start, triangles, dim) {
      var p = start;
      do {
        var a = p.prev, b = p.next.next;
        if (!equals(a, b) && intersects(a, p, p.next, b) && locallyInside(a, b) && locallyInside(b, a)) {
          triangles.push(a.i / dim | 0);
          triangles.push(p.i / dim | 0);
          triangles.push(b.i / dim | 0);
          removeNode(p);
          removeNode(p.next);
          p = start = b;
        }
        p = p.next;
      } while (p !== start);
      return filterPoints(p);
    }
    function splitEarcut(start, triangles, dim, minX, minY, invSize) {
      var a = start;
      do {
        var b = a.next.next;
        while (b !== a.prev) {
          if (a.i !== b.i && isValidDiagonal(a, b)) {
            var c = splitPolygon(a, b);
            a = filterPoints(a, a.next);
            c = filterPoints(c, c.next);
            earcutLinked(a, triangles, dim, minX, minY, invSize, 0);
            earcutLinked(c, triangles, dim, minX, minY, invSize, 0);
            return;
          }
          b = b.next;
        }
        a = a.next;
      } while (a !== start);
    }
    function eliminateHoles(data, holeIndices, outerNode, dim) {
      var queue = [], i, len, start, end, list;
      for (i = 0, len = holeIndices.length; i < len; i++) {
        start = holeIndices[i] * dim;
        end = i < len - 1 ? holeIndices[i + 1] * dim : data.length;
        list = linkedList(data, start, end, dim, false);
        if (list === list.next)
          list.steiner = true;
        queue.push(getLeftmost(list));
      }
      queue.sort(compareX);
      for (i = 0; i < queue.length; i++) {
        outerNode = eliminateHole(queue[i], outerNode);
      }
      return outerNode;
    }
    function compareX(a, b) {
      return a.x - b.x;
    }
    function eliminateHole(hole, outerNode) {
      var bridge = findHoleBridge(hole, outerNode);
      if (!bridge) {
        return outerNode;
      }
      var bridgeReverse = splitPolygon(bridge, hole);
      filterPoints(bridgeReverse, bridgeReverse.next);
      return filterPoints(bridge, bridge.next);
    }
    function findHoleBridge(hole, outerNode) {
      var p = outerNode, hx = hole.x, hy = hole.y, qx = -Infinity, m;
      do {
        if (hy <= p.y && hy >= p.next.y && p.next.y !== p.y) {
          var x = p.x + (hy - p.y) * (p.next.x - p.x) / (p.next.y - p.y);
          if (x <= hx && x > qx) {
            qx = x;
            m = p.x < p.next.x ? p : p.next;
            if (x === hx)
              return m;
          }
        }
        p = p.next;
      } while (p !== outerNode);
      if (!m)
        return null;
      var stop = m, mx = m.x, my = m.y, tanMin = Infinity, tan;
      p = m;
      do {
        if (hx >= p.x && p.x >= mx && hx !== p.x && pointInTriangle(hy < my ? hx : qx, hy, mx, my, hy < my ? qx : hx, hy, p.x, p.y)) {
          tan = Math.abs(hy - p.y) / (hx - p.x);
          if (locallyInside(p, hole) && (tan < tanMin || tan === tanMin && (p.x > m.x || p.x === m.x && sectorContainsSector(m, p)))) {
            m = p;
            tanMin = tan;
          }
        }
        p = p.next;
      } while (p !== stop);
      return m;
    }
    function sectorContainsSector(m, p) {
      return area(m.prev, m, p.prev) < 0 && area(p.next, m, m.next) < 0;
    }
    function indexCurve(start, minX, minY, invSize) {
      var p = start;
      do {
        if (p.z === 0)
          p.z = zOrder(p.x, p.y, minX, minY, invSize);
        p.prevZ = p.prev;
        p.nextZ = p.next;
        p = p.next;
      } while (p !== start);
      p.prevZ.nextZ = null;
      p.prevZ = null;
      sortLinked(p);
    }
    function sortLinked(list) {
      var i, p, q, e, tail, numMerges, pSize, qSize, inSize = 1;
      do {
        p = list;
        list = null;
        tail = null;
        numMerges = 0;
        while (p) {
          numMerges++;
          q = p;
          pSize = 0;
          for (i = 0; i < inSize; i++) {
            pSize++;
            q = q.nextZ;
            if (!q)
              break;
          }
          qSize = inSize;
          while (pSize > 0 || qSize > 0 && q) {
            if (pSize !== 0 && (qSize === 0 || !q || p.z <= q.z)) {
              e = p;
              p = p.nextZ;
              pSize--;
            } else {
              e = q;
              q = q.nextZ;
              qSize--;
            }
            if (tail)
              tail.nextZ = e;
            else
              list = e;
            e.prevZ = tail;
            tail = e;
          }
          p = q;
        }
        tail.nextZ = null;
        inSize *= 2;
      } while (numMerges > 1);
      return list;
    }
    function zOrder(x, y, minX, minY, invSize) {
      x = (x - minX) * invSize | 0;
      y = (y - minY) * invSize | 0;
      x = (x | x << 8) & 16711935;
      x = (x | x << 4) & 252645135;
      x = (x | x << 2) & 858993459;
      x = (x | x << 1) & 1431655765;
      y = (y | y << 8) & 16711935;
      y = (y | y << 4) & 252645135;
      y = (y | y << 2) & 858993459;
      y = (y | y << 1) & 1431655765;
      return x | y << 1;
    }
    function getLeftmost(start) {
      var p = start, leftmost = start;
      do {
        if (p.x < leftmost.x || p.x === leftmost.x && p.y < leftmost.y)
          leftmost = p;
        p = p.next;
      } while (p !== start);
      return leftmost;
    }
    function pointInTriangle(ax, ay, bx, by, cx, cy, px, py) {
      return (cx - px) * (ay - py) >= (ax - px) * (cy - py) && (ax - px) * (by - py) >= (bx - px) * (ay - py) && (bx - px) * (cy - py) >= (cx - px) * (by - py);
    }
    function isValidDiagonal(a, b) {
      return a.next.i !== b.i && a.prev.i !== b.i && !intersectsPolygon(a, b) && (locallyInside(a, b) && locallyInside(b, a) && middleInside(a, b) && (area(a.prev, a, b.prev) || area(a, b.prev, b)) || equals(a, b) && area(a.prev, a, a.next) > 0 && area(b.prev, b, b.next) > 0);
    }
    function area(p, q, r) {
      return (q.y - p.y) * (r.x - q.x) - (q.x - p.x) * (r.y - q.y);
    }
    function equals(p1, p2) {
      return p1.x === p2.x && p1.y === p2.y;
    }
    function intersects(p1, q1, p2, q2) {
      var o1 = sign(area(p1, q1, p2));
      var o2 = sign(area(p1, q1, q2));
      var o3 = sign(area(p2, q2, p1));
      var o4 = sign(area(p2, q2, q1));
      if (o1 !== o2 && o3 !== o4)
        return true;
      if (o1 === 0 && onSegment(p1, p2, q1))
        return true;
      if (o2 === 0 && onSegment(p1, q2, q1))
        return true;
      if (o3 === 0 && onSegment(p2, p1, q2))
        return true;
      if (o4 === 0 && onSegment(p2, q1, q2))
        return true;
      return false;
    }
    function onSegment(p, q, r) {
      return q.x <= Math.max(p.x, r.x) && q.x >= Math.min(p.x, r.x) && q.y <= Math.max(p.y, r.y) && q.y >= Math.min(p.y, r.y);
    }
    function sign(num) {
      return num > 0 ? 1 : num < 0 ? -1 : 0;
    }
    function intersectsPolygon(a, b) {
      var p = a;
      do {
        if (p.i !== a.i && p.next.i !== a.i && p.i !== b.i && p.next.i !== b.i && intersects(p, p.next, a, b))
          return true;
        p = p.next;
      } while (p !== a);
      return false;
    }
    function locallyInside(a, b) {
      return area(a.prev, a, a.next) < 0 ? area(a, b, a.next) >= 0 && area(a, a.prev, b) >= 0 : area(a, b, a.prev) < 0 || area(a, a.next, b) < 0;
    }
    function middleInside(a, b) {
      var p = a, inside = false, px = (a.x + b.x) / 2, py = (a.y + b.y) / 2;
      do {
        if (p.y > py !== p.next.y > py && p.next.y !== p.y && px < (p.next.x - p.x) * (py - p.y) / (p.next.y - p.y) + p.x)
          inside = !inside;
        p = p.next;
      } while (p !== a);
      return inside;
    }
    function splitPolygon(a, b) {
      var a2 = new Node(a.i, a.x, a.y), b2 = new Node(b.i, b.x, b.y), an = a.next, bp = b.prev;
      a.next = b;
      b.prev = a;
      a2.next = an;
      an.prev = a2;
      b2.next = a2;
      a2.prev = b2;
      bp.next = b2;
      b2.prev = bp;
      return b2;
    }
    function insertNode(i, x, y, last) {
      var p = new Node(i, x, y);
      if (!last) {
        p.prev = p;
        p.next = p;
      } else {
        p.next = last.next;
        p.prev = last;
        last.next.prev = p;
        last.next = p;
      }
      return p;
    }
    function removeNode(p) {
      p.next.prev = p.prev;
      p.prev.next = p.next;
      if (p.prevZ)
        p.prevZ.nextZ = p.nextZ;
      if (p.nextZ)
        p.nextZ.prevZ = p.prevZ;
    }
    function Node(i, x, y) {
      this.i = i;
      this.x = x;
      this.y = y;
      this.prev = null;
      this.next = null;
      this.z = 0;
      this.prevZ = null;
      this.nextZ = null;
      this.steiner = false;
    }
    earcut.deviation = function(data, holeIndices, dim, triangles) {
      var hasHoles = holeIndices && holeIndices.length;
      var outerLen = hasHoles ? holeIndices[0] * dim : data.length;
      var polygonArea = Math.abs(signedArea(data, 0, outerLen, dim));
      if (hasHoles) {
        for (var i = 0, len = holeIndices.length; i < len; i++) {
          var start = holeIndices[i] * dim;
          var end = i < len - 1 ? holeIndices[i + 1] * dim : data.length;
          polygonArea -= Math.abs(signedArea(data, start, end, dim));
        }
      }
      var trianglesArea = 0;
      for (i = 0; i < triangles.length; i += 3) {
        var a = triangles[i] * dim;
        var b = triangles[i + 1] * dim;
        var c = triangles[i + 2] * dim;
        trianglesArea += Math.abs(
          (data[a] - data[c]) * (data[b + 1] - data[a + 1]) - (data[a] - data[b]) * (data[c + 1] - data[a + 1])
        );
      }
      return polygonArea === 0 && trianglesArea === 0 ? 0 : Math.abs((trianglesArea - polygonArea) / polygonArea);
    };
    function signedArea(data, start, end, dim) {
      var sum = 0;
      for (var i = start, j = end - dim; i < end; i += dim) {
        sum += (data[j] - data[i]) * (data[i + 1] + data[j + 1]);
        j = i;
      }
      return sum;
    }
    earcut.flatten = function(data) {
      var dim = data[0][0].length, result = { vertices: [], holes: [], dimensions: dim }, holeIndex = 0;
      for (var i = 0; i < data.length; i++) {
        for (var j = 0; j < data[i].length; j++) {
          for (var d = 0; d < dim; d++)
            result.vertices.push(data[i][j][d]);
        }
        if (i > 0) {
          holeIndex += data[i - 1].length;
          result.holes.push(holeIndex);
        }
      }
      return result;
    };
  }
});

// node_modules/topojson-client/src/reverse.js
function reverse_default(array, n) {
  var t, j = array.length, i = j - n;
  while (i < --j)
    t = array[i], array[i++] = array[j], array[j] = t;
}

// node_modules/topojson-client/src/identity.js
function identity_default(x) {
  return x;
}

// node_modules/topojson-client/src/transform.js
function transform_default(transform) {
  if (transform == null)
    return identity_default;
  var x0, y0, kx = transform.scale[0], ky = transform.scale[1], dx = transform.translate[0], dy = transform.translate[1];
  return function(input, i) {
    if (!i)
      x0 = y0 = 0;
    var j = 2, n = input.length, output = new Array(n);
    output[0] = (x0 += input[0]) * kx + dx;
    output[1] = (y0 += input[1]) * ky + dy;
    while (j < n)
      output[j] = input[j], ++j;
    return output;
  };
}

// node_modules/topojson-client/src/feature.js
function feature_default(topology, o) {
  if (typeof o === "string")
    o = topology.objects[o];
  return o.type === "GeometryCollection" ? { type: "FeatureCollection", features: o.geometries.map(function(o2) {
    return feature(topology, o2);
  }) } : feature(topology, o);
}
function feature(topology, o) {
  var id = o.id, bbox = o.bbox, properties = o.properties == null ? {} : o.properties, geometry = object(topology, o);
  return id == null && bbox == null ? { type: "Feature", properties, geometry } : bbox == null ? { type: "Feature", id, properties, geometry } : { type: "Feature", id, bbox, properties, geometry };
}
function object(topology, o) {
  var transformPoint = transform_default(topology.transform), arcs = topology.arcs;
  function arc(i, points) {
    if (points.length)
      points.pop();
    for (var a = arcs[i < 0 ? ~i : i], k = 0, n = a.length; k < n; ++k) {
      points.push(transformPoint(a[k], k));
    }
    if (i < 0)
      reverse_default(points, n);
  }
  function point(p) {
    return transformPoint(p);
  }
  function line(arcs2) {
    var points = [];
    for (var i = 0, n = arcs2.length; i < n; ++i)
      arc(arcs2[i], points);
    if (points.length < 2)
      points.push(points[0]);
    return points;
  }
  function ring(arcs2) {
    var points = line(arcs2);
    while (points.length < 4)
      points.push(points[0]);
    return points;
  }
  function polygon(arcs2) {
    return arcs2.map(ring);
  }
  function geometry(o2) {
    var type = o2.type, coordinates;
    switch (type) {
      case "GeometryCollection":
        return { type, geometries: o2.geometries.map(geometry) };
      case "Point":
        coordinates = point(o2.coordinates);
        break;
      case "MultiPoint":
        coordinates = o2.coordinates.map(point);
        break;
      case "LineString":
        coordinates = line(o2.arcs);
        break;
      case "MultiLineString":
        coordinates = o2.arcs.map(line);
        break;
      case "Polygon":
        coordinates = polygon(o2.arcs);
        break;
      case "MultiPolygon":
        coordinates = o2.arcs.map(polygon);
        break;
      default:
        return null;
    }
    return { type, coordinates };
  }
  return geometry(o);
}

// node_modules/topojson-client/src/stitch.js
function stitch_default(topology, arcs) {
  var stitchedArcs = {}, fragmentByStart = {}, fragmentByEnd = {}, fragments = [], emptyIndex = -1;
  arcs.forEach(function(i, j) {
    var arc = topology.arcs[i < 0 ? ~i : i], t;
    if (arc.length < 3 && !arc[1][0] && !arc[1][1]) {
      t = arcs[++emptyIndex], arcs[emptyIndex] = i, arcs[j] = t;
    }
  });
  arcs.forEach(function(i) {
    var e = ends(i), start = e[0], end = e[1], f, g;
    if (f = fragmentByEnd[start]) {
      delete fragmentByEnd[f.end];
      f.push(i);
      f.end = end;
      if (g = fragmentByStart[end]) {
        delete fragmentByStart[g.start];
        var fg = g === f ? f : f.concat(g);
        fragmentByStart[fg.start = f.start] = fragmentByEnd[fg.end = g.end] = fg;
      } else {
        fragmentByStart[f.start] = fragmentByEnd[f.end] = f;
      }
    } else if (f = fragmentByStart[end]) {
      delete fragmentByStart[f.start];
      f.unshift(i);
      f.start = start;
      if (g = fragmentByEnd[start]) {
        delete fragmentByEnd[g.end];
        var gf = g === f ? f : g.concat(f);
        fragmentByStart[gf.start = g.start] = fragmentByEnd[gf.end = f.end] = gf;
      } else {
        fragmentByStart[f.start] = fragmentByEnd[f.end] = f;
      }
    } else {
      f = [i];
      fragmentByStart[f.start = start] = fragmentByEnd[f.end = end] = f;
    }
  });
  function ends(i) {
    var arc = topology.arcs[i < 0 ? ~i : i], p0 = arc[0], p1;
    if (topology.transform)
      p1 = [0, 0], arc.forEach(function(dp) {
        p1[0] += dp[0], p1[1] += dp[1];
      });
    else
      p1 = arc[arc.length - 1];
    return i < 0 ? [p1, p0] : [p0, p1];
  }
  function flush(fragmentByEnd2, fragmentByStart2) {
    for (var k in fragmentByEnd2) {
      var f = fragmentByEnd2[k];
      delete fragmentByStart2[f.start];
      delete f.start;
      delete f.end;
      f.forEach(function(i) {
        stitchedArcs[i < 0 ? ~i : i] = 1;
      });
      fragments.push(f);
    }
  }
  flush(fragmentByEnd, fragmentByStart);
  flush(fragmentByStart, fragmentByEnd);
  arcs.forEach(function(i) {
    if (!stitchedArcs[i < 0 ? ~i : i])
      fragments.push([i]);
  });
  return fragments;
}

// node_modules/topojson-client/src/merge.js
function planarRingArea(ring) {
  var i = -1, n = ring.length, a, b = ring[n - 1], area = 0;
  while (++i < n)
    a = b, b = ring[i], area += a[0] * b[1] - a[1] * b[0];
  return Math.abs(area);
}
function merge_default(topology) {
  return object(topology, mergeArcs.apply(this, arguments));
}
function mergeArcs(topology, objects) {
  var polygonsByArc = {}, polygons = [], groups = [];
  objects.forEach(geometry);
  function geometry(o) {
    switch (o.type) {
      case "GeometryCollection":
        o.geometries.forEach(geometry);
        break;
      case "Polygon":
        extract(o.arcs);
        break;
      case "MultiPolygon":
        o.arcs.forEach(extract);
        break;
    }
  }
  function extract(polygon) {
    polygon.forEach(function(ring) {
      ring.forEach(function(arc) {
        (polygonsByArc[arc = arc < 0 ? ~arc : arc] || (polygonsByArc[arc] = [])).push(polygon);
      });
    });
    polygons.push(polygon);
  }
  function area(ring) {
    return planarRingArea(object(topology, { type: "Polygon", arcs: [ring] }).coordinates[0]);
  }
  polygons.forEach(function(polygon) {
    if (!polygon._) {
      var group = [], neighbors = [polygon];
      polygon._ = 1;
      groups.push(group);
      while (polygon = neighbors.pop()) {
        group.push(polygon);
        polygon.forEach(function(ring) {
          ring.forEach(function(arc) {
            polygonsByArc[arc < 0 ? ~arc : arc].forEach(function(polygon2) {
              if (!polygon2._) {
                polygon2._ = 1;
                neighbors.push(polygon2);
              }
            });
          });
        });
      }
    }
  });
  polygons.forEach(function(polygon) {
    delete polygon._;
  });
  return {
    type: "MultiPolygon",
    arcs: groups.map(function(polygons2) {
      var arcs = [], n;
      polygons2.forEach(function(polygon) {
        polygon.forEach(function(ring) {
          ring.forEach(function(arc) {
            if (polygonsByArc[arc < 0 ? ~arc : arc].length < 2) {
              arcs.push(arc);
            }
          });
        });
      });
      arcs = stitch_default(topology, arcs);
      if ((n = arcs.length) > 1) {
        for (var i = 1, k = area(arcs[0]), ki, t; i < n; ++i) {
          if ((ki = area(arcs[i])) > k) {
            t = arcs[0], arcs[0] = arcs[i], arcs[i] = t, k = ki;
          }
        }
      }
      return arcs;
    }).filter(function(arcs) {
      return arcs.length > 0;
    })
  };
}

export {
  feature_default,
  merge_default,
  require_earcut
};
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