Convert DOM or XML/HTML to Mithril

2mithril.es7.js

const { map, reduce } = Array.prototype
const wrap = document.createElement( 'x' )

export const dom2mithril = dom =>
	dom.nodeType === 3
		? dom.nodeValue
		: dom.nodeType === 1
			? {
				tag      : dom.nodeName,
				attrs    : dom.attributes
					::reduce( ( attrs, attr ) =>
						( {
							...attrs,
							[ attr.name ] : attr.value
						} ),
						{}
					),
				children : dom.childNodes
					::map( dom2mithril )
			}
			: null

export const html2mithril = html => {
	while ( wrap.hasChildNodes() )
		wrap.removeChild( wrap.lastChild )
  
	return wrap
		.insertAdjacentHTML( 'beforeend', markup )
		.childNodes
		::map( dom2mithril )
}

2mithril.umd.js

( this.define || Object )(
	( this.exports || this ).module = {
		dom2mithril : function( dom ){
			return dom.nodeType === 3
				? dom.nodeValue
				: dom.nodeType === 1
					? {
						tag      : dom.nodeName,
						attrs    : Array.prototype.reduce.call( 
							dom.attributes, 
							function( attrs, attr ){
								attrs[ attr.name ] = attr.value

								return attrs
							},
							{}
						),
						children : Array.prototype.map.call( dom.childNodes, this.dom2mithril )
					}
					: null
		},

		html2mithril : function( html ){
			while ( wrap.hasChildNodes() )
				wrap.removeChild( wrap.lastChild )

			wrap.insertAdjacentHTML( 'beforeend', markup )
			
			return Array.prototype.map.call( childNodes, this.dom2mithril )
		}
	}
)