Function getHighestPriorityLanes

docs/index.js:4053–4105

(lanes)

var nextTransitionLane = 128,
  nextRetryLane = 4194304;
function getHighestPriorityLanes(lanes) {
  var pendingSyncLanes = lanes & 42;
  if (0 !== pendingSyncLanes) return pendingSyncLanes;
  switch (lanes & -lanes) {
    case 1:
      return 1;
    case 2:
      return 2;
    case 4:
      return 4;
    case 8:
      return 8;
    case 16:
      return 16;
    case 32:
      return 32;
    case 64:
      return 64;
    case 128:
    case 256:
    case 512:
    case 1024:
    case 2048:
    case 4096:
    case 8192:
    case 16384:
    case 32768:
    case 65536:
    case 131072:
    case 262144:
    case 524288:
    case 1048576:
    case 2097152:
      return lanes & 4194176;
    case 4194304:
    case 8388608:
    case 16777216:
    case 33554432:
      return lanes & 62914560;
    case 67108864:
      return 67108864;
    case 134217728:
      return 134217728;
    case 268435456:
      return 268435456;
    case 536870912:
      return 536870912;
    case 1073741824:
      return 0;
    default:
      return lanes;
  }
}
function getNextLanes(root, wipLanes) {
  var pendingLanes = root.pendingLanes;
  if (0 === pendingLanes) return 0;