in src/helper/merge-html-plugin.ts [89:95]
function open (node: Node): void {
function attributeString (attr: Attr): string {
return ' ' + attr.nodeName + '="' + escapeHTML(attr.value) + '"';
}
// @ts-expect-error
result += '<' + tag(node) + [].map.call(node.attributes, attributeString).join('') + '>';
}