get dataUrl() {
    if (this.isText) {
      const text = this.text;
      const urlEncodedText = encodeURIComponent(text).replace(/%2C/g, ',');
      const isUsAscii = !/[\x80-\uffff]/.test(text);
      const charsetParam = isUsAscii ? '' : ';charset=UTF-8';
      if (
        urlEncodedText.length + charsetParam.length <
        ';base64'.length + this.rawSrc.length * 1.37
      ) {
        return `data:${this.contentType}${
          isUsAscii ? '' : ';charset=UTF-8'
        },${urlEncodedText}`;
      }
    }
    // Default to base64 encoding:
    return `data:${this.contentType};base64,${this.rawSrc.toString('base64')}`;
  }
The `data:`-url of the asset for inlining

@type {String}