code: function isBeginningOfLine (node, index, nodes) {
    if (node != null) {
      for (let i = index - 1; i >= 0; --i) {
        const prevNode = nodes[i]
        if (prevNode == null) {
          continue
        }
  
        return node.loc.start.line !== prevNode.loc.end.line
      }
    }
    return false
  }
docs: Check whether the node is at the beginning of line.
  @param {Node} node The node to check.
  @param {number} index The index of the node in the nodes.
  @param {Node[]} nodes The array of nodes.
  @returns {boolean} `true` if the node is at the beginning of line.