code: function usedMemberSyntax(node) {
              if (node.specifiers.length === 0) {
                  return "none";
              }
              if (node.specifiers[0].type === "ImportNamespaceSpecifier") {
                  return "all";
              }
              if (node.specifiers.length === 1) {
                  return "single";
              }
              return "multiple";
  
          }
docs: Gets the used member syntax style.
  
  import "my-module.js" --> none
  import * as myModule from "my-module.js" --> all
  import {myMember} from "my-module.js" --> single
  import {foo, bar} from  "my-module.js" --> multiple
  
  @param {ASTNode} node - the ImportDeclaration node.
  @returns {string} used member parameter style, ["all", "multiple", "single"]