old_contents: 
  // import angular from 'rollup-plugin-angular';
  import commonjs from 'rollup-plugin-commonjs';
  import html from 'rollup-plugin-html';
  import nodeResolve from 'rollup-plugin-node-resolve';
  import typescript from 'rollup-plugin-typescript';
  import uglify from 'rollup-plugin-uglify';
  import { minify } from 'uglify-es';
  
  export default {
    entry: 'dist/index.js',
    dest: 'dist/bundle.umd.js',
    exports: 'named',
    sourceMap: false,
    format: 'umd',
    moduleName: '@ngx-markdown/core',
    onwarn,
    plugins: [
      commonjs(),
      html({
        include: '**/*.html',
        htmlMinifierOptions: {
          caseSensitive: true // need to do not lower letter
        }
      }),
      nodeResolve({
        // use "es2015" field for ES2015 modules with ES2015 code,
  	    // if possible
        es2015: true, // Default: false
  
        // use "module" field for ES2015 modules with ES5 code,
        // if possible
        module: true, // Default: true
  
        // use "jsnext:main" if possible
        // – see https://github.com/rollup/rollup/wiki/jsnext:main
        jsnext: true,  // Default: false
  
        // use "main" field or index.js, even if it's not an ES6 module
        // (needs to be converted from CommonJS to ES6
        // – see https://github.com/rollup/rollup-plugin-commonjs
        main: true,  // Default: true
  
        extensions: [ '.js', '.json' ]
      }),
      typescript({
        typescript: require('./node_modules/typescript')
      }),
      uglify({}, minify)
    ]
  };
  
  function onwarn(message) {
    const suppressed = [
      'UNRESOLVED_IMPORT',
      'THIS_IS_UNDEFINED'
    ];
  
    if (!suppressed.find(code => message.code === code)) {
      return console.warn(message.message);
    }
  }
  
new_contents: import angular from 'rollup-plugin-angular';
  import commonjs from 'rollup-plugin-commonjs';
  // import html from 'rollup-plugin-html';
  import nodeResolve from 'rollup-plugin-node-resolve';
  import typescript from 'rollup-plugin-typescript';
  import uglify from 'rollup-plugin-uglify';
  // import { minify } from 'uglify-es';
  
  export default {
    entry: 'dist/index.js',
    dest: 'dist/bundle.umd.js',
    exports: 'named',
    sourceMap: false,
    format: 'umd',
    moduleName: '@ngx-markdown/core',
    onwarn,
    plugins: [
      angular(),
      commonjs({
        namedExports: {
          'node_modules/rxjs/**': ['named']
        }
      }),
      nodeResolve({
        // use "es2015" field for ES2015 modules with ES2015 code,
  	    // if possible
        es2015: true, // Default: false
  
        // use "module" field for ES2015 modules with ES5 code,
        // if possible
        module: true, // Default: true
  
        // use "jsnext:main" if possible
        // – see https://github.com/rollup/rollup/wiki/jsnext:main
        jsnext: true,  // Default: false
  
        // use "main" field or index.js, even if it's not an ES6 module
        // (needs to be converted from CommonJS to ES6
        // – see https://github.com/rollup/rollup-plugin-commonjs
        main: true,  // Default: true
  
        extensions: [ '.js', '.json' ]
      }),
      typescript({
        typescript: require('./node_modules/typescript')
      }),
      uglify()
    ]
  };
  
  function onwarn(message) {
    const suppressed = [
      'UNRESOLVED_IMPORT',
      'THIS_IS_UNDEFINED'
    ];
  
    if (!suppressed.find(code => message.code === code)) {
      return console.warn(message.message);
    }
  }
  
subject: remove html plugin, use angular, remove uglify-es