@mpxjs/webpack-plugin/lib/style-compiler/plugins/vw.js

mpx compile core

const rpxRegExp = /\b(-?\d+(\.\d+)?)rpx\b/
const rpxRegExpG = /\b(-?\d+(\.\d+)?)rpx\b/g

module.exports = (options = {}) => {
  return {
    postcssPlugin: 'vw',
    Once: (root) => {
      const rpx2vwRatio = +(100 / 750).toFixed(8)

      const transRpxFn = options.transRpxFn && typeof options.transRpxFn === 'function'
        ? options.transRpxFn
        : function (match, $1) {
          if ($1 === '0') return $1
          return `${$1 * rpx2vwRatio}vw`
        }
      function transVw (declaration) {
        if (rpxRegExp.test(declaration.value)) {
          declaration.value = declaration.value.replace(rpxRegExpG, transRpxFn)
        }
      }

      root.walkRules(rule => {
        rule.walkDecls(declaration => {
          transVw(declaration)
        })
      })
    }
  }
}

module.exports.postcss = true