let cls1 = css`
  color: red;
  .cls1 {
  display: block;
  background: url('...') no-repeat;

  & > h2 {
    color: red;
    font-size: ${size}px;
  }
}
`

let cls1 = css`color:red;.cls1{display:block;background:url('...') no-repeat;&>h2{color:red;font-size:${size}px;}}`

import { defaultTagRules } from 'minify-cssinjs-loader'

module.exports = {

  module: {
    rules: [
      {
        test: /\.tsx?$/,
        use: [{
          loader: "ts-loader",
          options: {
          }
        }, {
          loader: 'minify-cssinjs-loader',
          options: {
            // default is ['css', 'injectGlobal', 'keyframes', /^styled(\.[a-z]+|\(([A-Z][a-z]+|['"][a-z]+["'])\))$/],
            // you can override or append custom trule default tagRules,
            // it accepts string/RedExp/Function.
            //
            // tagRules: [...], // override default rules.
            // tagRules: defaultTagRules.concat(...), // append new rules
            // recast: { ... }, custom parameters passed to recast(https://github.com/benjamn/recast).
          }
        }, ],
      },
    ]
  }
}