npm i -D posthtml-postcssimport {dirname} from 'node:path'
import {readFileSync} from 'node:fs'
import {fileURLToPath} from 'node:url'
import posthtml from 'posthtml'
import postcss from 'posthtml-postcss'
const postcssPlugins = []
const postcssOptions = {}
const filterType = /^text\/css$/
const __filename = fileURLToPath(import.meta.url)
const __dirname = dirname(__filename)
const filePath = `${__dirname}/index.html`
const html = readFileSync(filePath, 'utf8')
posthtml([
postcss(postcssPlugins, postcssOptions, filterType)
])
.process(html, {from: filePath})
.then((result) => console.log(result.html))If you don't pass any arguments to posthtml-postcss, it will try to use your project's PostCSS configuration (see postcss-load-config).
Notice that we're setting the option from when calling process. posthtml-postcss forwards this to PostCSS, which is useful for syntax error messages. (postcss-cli and gulp-posthtml are setting from automatically.)
import posthtml from 'posthtml'
import postcss from 'posthtml-postcss'
import autoprefixer from 'autoprefixer'
const postcssPlugins = [
autoprefixer({ browsers: ['last 2 versions'] })
]
const postcssOptions = {}
const filterType = /^text\/css$/
const html = `
<style>div { display: flex; }</style>
<div style="display: flex;">Text</div>
`
posthtml([
postcss(postcssPlugins, postcssOptions, filterType)
])
.process(html)
.then(result => console.log(result.html))Output:
<style>
div { display: -webkit-flex;display: -ms-flexbox;display: flex; }
</style>
<div style="display: -webkit-flex;display: -ms-flexbox;display: flex;">
Text
</div>
