How to use the domutils.getOuterHTML function in domutils

return source.alter( function( value ) {
      try {
        de&&ug( value.dom );
        
        value.content = serialize( value.dom );
      } catch( e ) {
        value.error   = e;
        value.content = null;
      }
    } );
  } ); // html_serialize()

      post.more = (moreNodes.map(node => domutils.getOuterHTML(node))).join('');
    }

get outerHTML() {
    return getOuterHTML(this._dom)
  }

const handler = new DomHandler((error, dom) => {
            if (error) {
                throw error;
            }
            else {
                const node = find(dom, node => node.name === 'icon');
                node.name = 'svg';
                const { attribs } = node;
                assign(attribs, {
                    xmlns: 'http://www.w3.org/2000/svg',
                    style,
                });
                delete attribs['{...$$props}'];
                svg = getOuterHTML([node]);
            }
        });
        const parser = new Parser(handler);

const handler = new DomHandler((error, dom)=>{
			if (error) {
				throw error
			} else {
				const node = find(dom, node=>node.name === 'icon')
				node.name = 'svg'
				const { attribs } = node
				assign(attribs, {
					xmlns: 'http://www.w3.org/2000/svg',
					style,
				})
				delete attribs['{...$$props}']
				svg = getOuterHTML([node])
			}
		})
		const parser = new Parser(handler)