Javascript 未定义showContent

未捕获引用错误：未定义showContent。尽管定义了所有其他模块（主模块、关于模块）。对于组装，我使用rollup。错在哪里

import showContent from 'modules/showContent';
import main from 'modules/screens/main';
import about from 'modules/screens/about';
import blog from 'modules/screens/blog';
import contacts from 'modules/screens/contacts';
import gallery from 'modules/screens/gallery';

$(document).ready(function() {
  showContent(main);
    $(document).on("click", "a", (e) => {
        if ( $(this).hasClass('active') ) return;

        $("a").removeClass('active');
        $(this).addClass('active');

        $(".slide").slideUp(800);

        const self = this;
        setTimeout(() => showContent($(self).attr('id')), 800);
    });
});

showContent.js

const showContent = (contentTemplate) => {
  const content = document.querySelector(`main`);
  content.innerHTML = ``;
  content.appendChild(contentTemplate);
};

export default showContent;

rollup.config.js

export default {
  entry: 'script.js',
  dest: 'script.min.js',
  format: 'iife',
  sourceMap: 'inline',
};

package.json

{
  "name": "fsdf",
  "version": "0.0.0",
  "description": "",
  "main": "script.min.js",
  "devDependencies": {
    "rollup": "^0.50.0"
  },
  "dependencies": {}
}

我开始使用“/node\u modules/.bin/rollup-c”进行组装。 慰问：