Function registerStyles

Register scoped style sheets

// using css-loader exportType 'string'
import sheets, * as styles from './styles.module.css'

registerStyles(sheets)

class Container extends HTMLElement {
  connectedCallback() {
    const shadowRoot = this.attachShadow({mode: 'open'})
    shadowRoot.innerHTML = `
      <div class=${styles.container}>
        ...
      </div>
    `
  }
}
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