code: function makeRemove(child, node) {
    // NOTE: Null values reduce hidden classes.
    return {
      type: 'REMOVE_NODE',
      content: null,
      fromIndex: child._mountIndex,
      fromNode: node,
      toIndex: null,
      afterNode: null
    };
  }
docs: Make an update for removing an element at an index.
  
  @param {number} fromIndex Index of the element to remove.
  @private