code: function isInside(inner, outer) {
              return (
                  inner.range[0] >= outer.range[0] &&
                  inner.range[1] <= outer.range[1]
              );
          }
docs: Checks the position of given nodes.
  
  @param {ASTNode} inner - A node which is expected as inside.
  @param {ASTNode} outer - A node which is expected as outside.
  @returns {boolean} `true` if the `inner` node exists in the `outer` node.
  @private