This method provides the ability to reference external css/js files for the generated html, and supports adjusting the file loading sequence.
when using it:
```js
import html from '@rollup/plugin-html';
import templateExternalFiles from '@rollup/plugin-html/recipes/external-files';
import postcss from 'rollup-plugin-postcss';
export default [
{
input: ['demo/demo.ts'],
output: [{ file: 'dist/demo.js' }],
plugins: [
postcss({
extract: 'demo.css',
minimize: false,
use: ['sass'],
extensions: ['.scss', '.css']
}),
html({
title: 'sdk demo page',
publicPath: './',
fileName: 'demo.html',
attributes: { html: { lang: 'zh-cn' } },
template: templateExternalFiles([
{ type: 'js', file: 'example1.js', pos: 'before' },
{ type: 'js', file: 'example2.js', pos: 'before' },
{ type: 'js', file: 'example3.js' },
{ type: 'js', file: 'example4.js', pos: 'before' },
{ type: 'css', file: 'example1.css', pos: 'before' },
{ type: 'css', file: 'example2.css', pos: 'before' },
{ type: 'css', file: 'example3.css' },
{ type: 'css', file: 'example4.css', pos: 'before' }
])
})
]
}
];
```
The content of the generated html file:
```html
sdk demo page
```