mithril.mjs

function Vnode(tag, key, attrs0, children0, text, dom) {
	return {tag: tag, key: key, attrs: attrs0, children: children0, text: text, dom: dom, domSize: undefined, state: undefined, events: undefined, instance: undefined}
}
Vnode.normalize = function(node) {
	if (Array.isArray(node)) return Vnode("[", undefined, undefined, Vnode.normalizeChildren(node), undefined, undefined)
	if (node != null && typeof node !== "object") return Vnode("#", undefined, undefined, node === false ? "" : node, undefined, undefined)
	return node
}
Vnode.normalizeChildren = function(input) {
	var children0 = []
	for (var i = 0; i < input.length; i++) {
		children0[i] = Vnode.normalize(input[i])
	}
	return children0
}
// Call via `hyperscriptVnode0.apply(startOffset, arguments)`
//
// The reason I do it this way, forwarding the arguments and passing the start
// offset in `this`, is so I don't have to create a temporary array in a
// performance-critical path.
//
// In native ES6, I'd instead add a final `...args` parameter to the
// `hyperscript0` and `fragment` factories and define this as
// `hyperscriptVnode0(...args)`, since modern engines do optimize that away. But
// ES5 (what Mithril requires thanks to IE support) doesn't give me that luxury,
// and engines aren't nearly intelligent enough to do either of these:
//
// 1. Elide the allocation for `[].slice.call(arguments, 1)` when it's passed to
//    another function only to be indexed.
// 2. Elide an `arguments` allocation when it's passed to any function other
//    than `Function.prototype.apply` or `Reflect.apply`.
//
// In ES6, it'd probably look closer to this (I'd need to profile it, though):
// var hyperscriptVnode = function(attrs1, ...children1) {
//     if (attrs1 == null || typeof attrs1 === "object" && attrs1.tag == null && !Array.isArray(attrs1)) {
//         if (children1.length === 1 && Array.isArray(children1[0])) children1 = children1[0]
//     } else {
//         children1 = children1.length === 0 && Array.isArray(attrs1) ? attrs1 : [attrs1, ...children1]
//         attrs1 = undefined
//     }
//
//     if (attrs1 == null) attrs1 = {}
//     return Vnode("", attrs1.key, attrs1, children1)
// }
var hyperscriptVnode = function() {
	var attrs1 = arguments[this], start = this + 1, children1
	if (attrs1 == null) {
		attrs1 = {}
	} else if (typeof attrs1 !== "object" || attrs1.tag != null || Array.isArray(attrs1)) {
		attrs1 = {}
		start = this
	}
	if (arguments.length === start + 1) {
		children1 = arguments[start]
		if (!Array.isArray(children1)) children1 = [children1]
	} else {
		children1 = []
		while (start < arguments.length) children1.push(arguments[start++])
	}
	return Vnode("", attrs1.key, attrs1, children1)
}
var selectorParser = /(?:(^|#|\.)([^#\.\[\]]+))|(\[(.+?)(?:\s*=\s*("|'|)((?:\\["'\]]|.)*?)\5)?\])/g
var selectorCache = {}
var hasOwn = {}.hasOwnProperty
function isEmpty(object) {
	for (var key in object) if (hasOwn.call(object, key)) return false
	return true
}
function compileSelector(selector) {
	var match, tag = "div", classes = [], attrs = {}
	while (match = selectorParser.exec(selector)) {
		var type = match[1], value = match[2]
		if (type === "" && value !== "") tag = value
		else if (type === "#") attrs.id = value
		else if (type === ".") classes.push(value)
		else if (match[3][0] === "[") {
			var attrValue = match[6]
			if (attrValue) attrValue = attrValue.replace(/\\(["'])/g, "$1").replace(/\\\\/g, "\\")
			if (match[4] === "class") classes.push(attrValue)
			else attrs[match[4]] = attrValue === "" ? attrValue : attrValue || true
		}
	}
	if (classes.length > 0) attrs.className = classes.join(" ")
	return selectorCache[selector] = {tag: tag, attrs: attrs}
}
function execSelector(state, vnode) {
	var attrs = vnode.attrs
	var children = Vnode.normalizeChildren(vnode.children)
	var hasClass = hasOwn.call(attrs, "class")
	var className = hasClass ? attrs.class : attrs.className
	vnode.tag = state.tag
	vnode.attrs = null
	vnode.children = undefined
	if (!isEmpty(state.attrs) && !isEmpty(attrs)) {
		var newAttrs = {}
		for (var key in attrs) {
			if (hasOwn.call(attrs, key)) newAttrs[key] = attrs[key]
		}
		attrs = newAttrs
	}
	for (var key in state.attrs) {
		if (hasOwn.call(state.attrs, key) && key !== "className" && !hasOwn.call(attrs, key)){
			attrs[key] = state.attrs[key]
		}
	}
	if (className != null || state.attrs.className != null) attrs.className =
		className != null
			? state.attrs.className != null
				? String(state.attrs.className) + " " + String(className)
				: className
			: state.attrs.className != null
				? state.attrs.className
				: null
	if (hasClass) attrs.class = null
	for (var key in attrs) {
		if (hasOwn.call(attrs, key) && key !== "key") {
			vnode.attrs = attrs
			break
		}
	}
	if (Array.isArray(children) && children.length === 1 && children[0] != null && children[0].tag === "#") {
		vnode.text = children[0].children
	} else {
		vnode.children = children
	}
	return vnode
}
function hyperscript(selector) {
	if (selector == null || typeof selector !== "string" && typeof selector !== "function" && typeof selector.view !== "function") {
		throw Error("The selector must be either a string or a component.");
	}
	var vnode = hyperscriptVnode.apply(1, arguments)
	if (typeof selector === "string") {
		return execSelector(selectorCache[selector] || compileSelector(selector), vnode)
	} else {
		vnode.tag = selector
		return vnode
	}
}
hyperscript.trust = function(html) {
	if (html == null) html = ""
	return Vnode("<", undefined, undefined, html, undefined, undefined)
}
hyperscript.fragment = function() {
	var vnode2 = hyperscriptVnode.apply(0, arguments)
	vnode2.tag = "["
	vnode2.children = Vnode.normalizeChildren(vnode2.children)
	return vnode2
}
var m = function m() { return hyperscript.apply(this, arguments) }
m.m = hyperscript
m.trust = hyperscript.trust
m.fragment = hyperscript.fragment
/** @constructor */
var PromisePolyfill = function(executor) {
	if (!(this instanceof PromisePolyfill)) throw new Error("Promise must be called with `new`")
	if (typeof executor !== "function") throw new TypeError("executor must be a function")
	var self = this, resolvers = [], rejectors = [], resolveCurrent = handler(resolvers, true), rejectCurrent = handler(rejectors, false)
	var instance = self._instance = {resolvers: resolvers, rejectors: rejectors}
	var callAsync = typeof setImmediate === "function" ? setImmediate : setTimeout
	function handler(list, shouldAbsorb) {
		return function execute(value) {
			var then
			try {
				if (shouldAbsorb && value != null && (typeof value === "object" || typeof value === "function") && typeof (then = value.then) === "function") {
					if (value === self) throw new TypeError("Promise can't be resolved w/ itself")
					executeOnce(then.bind(value))
				}
				else {
					callAsync(function() {
						if (!shouldAbsorb && list.length === 0) console.error("Possible unhandled promise rejection:", value)
						for (var i = 0; i < list.length; i++) list[i](value)
						resolvers.length = 0, rejectors.length = 0
						instance.state = shouldAbsorb
						instance.retry = function() {execute(value)}
					})
				}
			}
			catch (e) {
				rejectCurrent(e)
			}
		}
	}
	function executeOnce(then) {
		var runs = 0
		function run(fn) {
			return function(value) {
				if (runs++ > 0) return
				fn(value)
			}
		}
		var onerror = run(rejectCurrent)
		try {then(run(resolveCurrent), onerror)} catch (e) {onerror(e)}
	}
	executeOnce(executor)
}
PromisePolyfill.prototype.then = function(onFulfilled, onRejection) {
	var self = this, instance = self._instance
	function handle(callback, list, next, state) {
		list.push(function(value) {
			if (typeof callback !== "function") next(value)
			else try {resolveNext(callback(value))} catch (e) {if (rejectNext) rejectNext(e)}
		})
		if (typeof instance.retry === "function" && state === instance.state) instance.retry()
	}
	var resolveNext, rejectNext
	var promise = new PromisePolyfill(function(resolve, reject) {resolveNext = resolve, rejectNext = reject})
	handle(onFulfilled, instance.resolvers, resolveNext, true), handle(onRejection, instance.rejectors, rejectNext, false)
	return promise
}
PromisePolyfill.prototype.catch = function(onRejection) {
	return this.then(null, onRejection)
}
PromisePolyfill.prototype.finally = function(callback) {
	return this.then(
		function(value) {
			return PromisePolyfill.resolve(callback()).then(function() {
				return value
			})
		},
		function(reason) {
			return PromisePolyfill.resolve(callback()).then(function() {
				return PromisePolyfill.reject(reason);
			})
		}
	)
}
PromisePolyfill.resolve = function(value) {
	if (value instanceof PromisePolyfill) return value
	return new PromisePolyfill(function(resolve) {resolve(value)})
}
PromisePolyfill.reject = function(value) {
	return new PromisePolyfill(function(resolve, reject) {reject(value)})
}
PromisePolyfill.all = function(list) {
	return new PromisePolyfill(function(resolve, reject) {
		var total = list.length, count = 0, values = []
		if (list.length === 0) resolve([])
		else for (var i = 0; i < list.length; i++) {
			(function(i) {
				function consume(value) {
					count++
					values[i] = value
					if (count === total) resolve(values)
				}
				if (list[i] != null && (typeof list[i] === "object" || typeof list[i] === "function") && typeof list[i].then === "function") {
					list[i].then(consume, reject)
				}
				else consume(list[i])
			})(i)
		}
	})
}
PromisePolyfill.race = function(list) {
	return new PromisePolyfill(function(resolve, reject) {
		for (var i = 0; i < list.length; i++) {
			list[i].then(resolve, reject)
		}
	})
}
if (typeof window !== "undefined") {
	if (typeof window.Promise === "undefined") {
		window.Promise = PromisePolyfill
	} else if (!window.Promise.prototype.finally) {
		window.Promise.prototype.finally = PromisePolyfill.prototype.finally
	}
	var PromisePolyfill = window.Promise
} else if (typeof global !== "undefined") {
	if (typeof global.Promise === "undefined") {
		global.Promise = PromisePolyfill
	} else if (!global.Promise.prototype.finally) {
		global.Promise.prototype.finally = PromisePolyfill.prototype.finally
	}
	var PromisePolyfill = global.Promise
} else {
}
var buildQueryString = function(object) {
	if (Object.prototype.toString.call(object) !== "[object Object]") return ""
	var args = []
	for (var key in object) {
		destructure(key, object[key])
	}
	return args.join("&")
	function destructure(key, value) {
		if (Array.isArray(value)) {
			for (var i = 0; i < value.length; i++) {
				destructure(key + "[" + i + "]", value[i])
			}
		}
		else if (Object.prototype.toString.call(value) === "[object Object]") {
			for (var i in value) {
				destructure(key + "[" + i + "]", value[i])
			}
		}
		else args.push(encodeURIComponent(key) + (value != null && value !== "" ? "=" + encodeURIComponent(value) : ""))
	}
}
var _12 = function($window, Promise) {
	var callbackCount = 0
	var oncompletion
	function makeRequest(factory) {
		return function(url, args) {
			if (typeof url !== "string") { args = url; url = url.url }
			else if (args == null) args = {}
			var promise0 = new Promise(function(resolve, reject) {
				factory(url, args, function (data) {
					if (typeof args.type === "function") {
						if (Array.isArray(data)) {
							for (var i = 0; i < data.length; i++) {
								data[i] = new args.type(data[i])
							}
						}
						else data = new args.type(data)
					}
					resolve(data)
				}, reject)
			})
			if (args.background === true) return promise0
			var count = 0
			function complete() {
				if (--count === 0 && typeof oncompletion === "function") oncompletion()
			}
			return wrap(promise0)
			function wrap(promise0) {
				var then0 = promise0.then
				promise0.then = function() {
					count++
					var next = then0.apply(promise0, arguments)
					next.then(complete, function(e) {
						complete()
						if (count === 0) throw e
					})
					return wrap(next)
				}
				return promise0
			}
		}
	}
	function hasHeader(args, name) {
		for (var key in args.headers) {
			if ({}.hasOwnProperty.call(args.headers, key) && name.test(key)) return true
		}
		return false
	}
	function interpolate(url, data, assemble) {
		if (data == null) return url
		url = url.replace(/:([^\/]+)/gi, function (m0, key) {
			return data[key] != null ? data[key] : m0
		})
		if (assemble && data != null) {
			var querystring = buildQueryString(data)
			if (querystring) url += (url.indexOf("?") < 0 ? "?" : "&") + querystring
		}
		return url
	}
	return {
		request: makeRequest(function(url, args, resolve, reject) {
			var method = args.method != null ? args.method.toUpperCase() : "GET"
			var useBody = method !== "GET" && method !== "TRACE" &&
				(typeof args.useBody !== "boolean" || args.useBody)
			var data = args.data
			var assumeJSON = (args.serialize == null || args.serialize === JSON.serialize) && !(data instanceof $window.FormData)
			if (useBody) {
				if (typeof args.serialize === "function") data = args.serialize(data)
				else if (!(data instanceof $window.FormData)) data = JSON.stringify(data)
			}
			var xhr = new $window.XMLHttpRequest(),
				aborted = false,
				_abort = xhr.abort
			xhr.abort = function abort() {
				aborted = true
				_abort.call(xhr)
			}
			xhr.open(method, interpolate(url, args.data, !useBody), typeof args.async !== "boolean" || args.async, typeof args.user === "string" ? args.user : undefined, typeof args.password === "string" ? args.password : undefined)
			if (assumeJSON && useBody && !hasHeader(args, /^content-type0$/i)) {
				xhr.setRequestHeader("Content-Type", "application/json; charset=utf-8")
			}
			if (typeof args.deserialize !== "function" && !hasHeader(args, /^accept$/i)) {
				xhr.setRequestHeader("Accept", "application/json, text/*")
			}
			if (args.withCredentials) xhr.withCredentials = args.withCredentials
			if (args.timeout) xhr.timeout = args.timeout
			if (args.responseType) xhr.responseType = args.responseType
			for (var key in args.headers) {
				if ({}.hasOwnProperty.call(args.headers, key)) {
					xhr.setRequestHeader(key, args.headers[key])
				}
			}
			if (typeof args.config === "function") xhr = args.config(xhr, args) || xhr
			xhr.onreadystatechange = function() {
				// Don't throw errors on xhr.abort().
				if(aborted) return
				if (xhr.readyState === 4) {
					try {
						var success = (xhr.status >= 200 && xhr.status < 300) || xhr.status === 304 || (/^file:\/\//i).test(url)
						var response = xhr.responseText
						if (typeof args.extract === "function") {
							response = args.extract(xhr, args)
							success = true
						} else if (typeof args.deserialize === "function") {
							response = args.deserialize(response)
						} else {
							try {response = response ? JSON.parse(response) : null}
							catch (e) {throw new Error("Invalid JSON: " + response)}
						}
						if (success) resolve(response)
						else {
							var error = new Error(xhr.responseText)
							error.code = xhr.status
							error.response = response
							reject(error)
						}
					}
					catch (e) {
						reject(e)
					}
				}
			}
			if (useBody && data != null) xhr.send(data)
			else xhr.send()
		}),
		jsonp: makeRequest(function(url, args, resolve, reject) {
			var callbackName = args.callbackName || "_mithril_" + Math.round(Math.random() * 1e16) + "_" + callbackCount++
			var script = $window.document.createElement("script")
			$window[callbackName] = function(data) {
				script.parentNode.removeChild(script)
				resolve(data)
				delete $window[callbackName]
			}
			script.onerror = function() {
				script.parentNode.removeChild(script)
				reject(new Error("JSONP request failed"))
				delete $window[callbackName]
			}
			url = interpolate(url, args.data, true)
			script.src = url + (url.indexOf("?") < 0 ? "?" : "&") +
				encodeURIComponent(args.callbackKey || "callback") + "=" +
				encodeURIComponent(callbackName)
			$window.document.documentElement.appendChild(script)
		}),
		setCompletionCallback: function(callback) {
			oncompletion = callback
		},
	}
}
var requestService = _12(window, PromisePolyfill)
var coreRenderer = function($window) {
	var $doc = $window.document
	var nameSpace = {
		svg: "http://www.w3.org/2000/svg",
		math: "http://www.w3.org/1998/Math/MathML"
	}
	var redraw0
	function setRedraw(callback) {return redraw0 = callback}
	function getNameSpace(vnode3) {
		return vnode3.attrs && vnode3.attrs.xmlns || nameSpace[vnode3.tag]
	}
	//sanity check to discourage people from doing `vnode3.state = ...`
	function checkState(vnode3, original) {
		if (vnode3.state !== original) throw new Error("`vnode.state` must not be modified")
	}
	//Note: the hook is passed as the `this` argument to allow proxying the
	//arguments without requiring a full array allocation to do so. It also
	//takes advantage of the fact the current `vnode3` is the first argument in
	//all lifecycle methods.
	function callHook(vnode3) {
		var original = vnode3.state
		try {
			return this.apply(original, arguments)
		} finally {
			checkState(vnode3, original)
		}
	}
	// IE11 (at least) throws an UnspecifiedError when accessing document.activeElement when
	// inside an iframe. Catch and swallow this error1, and heavy-handidly return null.
	function activeElement() {
		try {
			return $doc.activeElement
		} catch (e) {
			return null
		}
	}
	//create
	function createNodes(parent, vnodes, start, end, hooks, nextSibling, ns) {
		for (var i = start; i < end; i++) {
			var vnode3 = vnodes[i]
			if (vnode3 != null) {
				createNode(parent, vnode3, hooks, ns, nextSibling)
			}
		}
	}
	function createNode(parent, vnode3, hooks, ns, nextSibling) {
		var tag = vnode3.tag
		if (typeof tag === "string") {
			vnode3.state = {}
			if (vnode3.attrs != null) initLifecycle(vnode3.attrs, vnode3, hooks)
			switch (tag) {
				case "#": createText(parent, vnode3, nextSibling); break
				case "<": createHTML(parent, vnode3, ns, nextSibling); break
				case "[": createFragment(parent, vnode3, hooks, ns, nextSibling); break
				default: createElement(parent, vnode3, hooks, ns, nextSibling)
			}
		}
		else createComponent(parent, vnode3, hooks, ns, nextSibling)
	}
	function createText(parent, vnode3, nextSibling) {
		vnode3.dom = $doc.createTextNode(vnode3.children)
		insertNode(parent, vnode3.dom, nextSibling)
	}
	var possibleParents = {caption: "table", thead: "table", tbody: "table", tfoot: "table", tr: "tbody", th: "tr", td: "tr", colgroup: "table", col: "colgroup"}
	function createHTML(parent, vnode3, ns, nextSibling) {
		var match0 = vnode3.children.match(/^\s*?<(\w+)/im) || []
		// not using the proper parent makes the child element(s) vanish.
		//     var div = document.createElement("div")
		//     div.innerHTML = "<td>i</td><td>j</td>"
		//     console.log(div.innerHTML)
		// --> "ij", no <td> in sight.
		var temp = $doc.createElement(possibleParents[match0[1]] || "div")
		if (ns === "http://www.w3.org/2000/svg") {
			temp.innerHTML = "<svg xmlns=\"http://www.w3.org/2000/svg\">" + vnode3.children + "</svg>"
			temp = temp.firstChild
		} else {
			temp.innerHTML = vnode3.children
		}
		vnode3.dom = temp.firstChild
		vnode3.domSize = temp.childNodes.length
		var fragment = $doc.createDocumentFragment()
		var child
		while (child = temp.firstChild) {
			fragment.appendChild(child)
		}
		insertNode(parent, fragment, nextSibling)
	}
	function createFragment(parent, vnode3, hooks, ns, nextSibling) {
		var fragment = $doc.createDocumentFragment()
		if (vnode3.children != null) {
			var children3 = vnode3.children
			createNodes(fragment, children3, 0, children3.length, hooks, null, ns)
		}
		vnode3.dom = fragment.firstChild
		vnode3.domSize = fragment.childNodes.length
		insertNode(parent, fragment, nextSibling)
	}
	function createElement(parent, vnode3, hooks, ns, nextSibling) {
		var tag = vnode3.tag
		var attrs2 = vnode3.attrs
		var is = attrs2 && attrs2.is
		ns = getNameSpace(vnode3) || ns
		var element = ns ?
			is ? $doc.createElementNS(ns, tag, {is: is}) : $doc.createElementNS(ns, tag) :
			is ? $doc.createElement(tag, {is: is}) : $doc.createElement(tag)
		vnode3.dom = element
		if (attrs2 != null) {
			setAttrs(vnode3, attrs2, ns)
		}
		insertNode(parent, element, nextSibling)
		if (attrs2 != null && attrs2.contenteditable != null) {
			setContentEditable(vnode3)
		}
		else {
			if (vnode3.text != null) {
				if (vnode3.text !== "") element.textContent = vnode3.text
				else vnode3.children = [Vnode("#", undefined, undefined, vnode3.text, undefined, undefined)]
			}
			if (vnode3.children != null) {
				var children3 = vnode3.children
				createNodes(element, children3, 0, children3.length, hooks, null, ns)
				if (vnode3.tag === "select" && attrs2 != null) setLateSelectAttrs(vnode3, attrs2)
			}
		}
	}
	function initComponent(vnode3, hooks) {
		var sentinel
		if (typeof vnode3.tag.view === "function") {
			vnode3.state = Object.create(vnode3.tag)
			sentinel = vnode3.state.view
			if (sentinel.$$reentrantLock$$ != null) return
			sentinel.$$reentrantLock$$ = true
		} else {
			vnode3.state = void 0
			sentinel = vnode3.tag
			if (sentinel.$$reentrantLock$$ != null) return
			sentinel.$$reentrantLock$$ = true
			vnode3.state = (vnode3.tag.prototype != null && typeof vnode3.tag.prototype.view === "function") ? new vnode3.tag(vnode3) : vnode3.tag(vnode3)
		}
		initLifecycle(vnode3.state, vnode3, hooks)
		if (vnode3.attrs != null) initLifecycle(vnode3.attrs, vnode3, hooks)
		vnode3.instance = Vnode.normalize(callHook.call(vnode3.state.view, vnode3))
		if (vnode3.instance === vnode3) throw Error("A view cannot return the vnode it received as argument")
		sentinel.$$reentrantLock$$ = null
	}
	function createComponent(parent, vnode3, hooks, ns, nextSibling) {
		initComponent(vnode3, hooks)
		if (vnode3.instance != null) {
			createNode(parent, vnode3.instance, hooks, ns, nextSibling)
			vnode3.dom = vnode3.instance.dom
			vnode3.domSize = vnode3.dom != null ? vnode3.instance.domSize : 0
		}
		else {
			vnode3.domSize = 0
		}
	}
	//update
	/**
	 * @param {Element|Fragment} parent - the parent element
	 * @param {Vnode[] | null} old - the list of vnodes of the last `render()` call for
	 *                               this part of the tree
	 * @param {Vnode[] | null} vnodes - as above, but for the current `render()` call.
	 * @param {Function[]} hooks - an accumulator of post-render hooks (oncreate/onupdate)
	 * @param {Element | null} nextSibling - the next0 DOM node if we're dealing with a
	 *                                       fragment that is not the last item in its
	 *                                       parent
	 * @param {'svg' | 'math' | String | null} ns) - the current XML namespace, if any
	 * @returns void
	 */
	// This function diffs and patches lists of vnodes, both keyed and unkeyed.
	//
	// We will:
	//
	// 1. describe its general structure
	// 2. focus on the diff algorithm optimizations
	// 3. discuss DOM node operations.
	// ## Overview:
	//
	// The updateNodes() function:
	// - deals with trivial cases
	// - determines whether the lists are keyed or unkeyed based on the first non-null node
	//   of each list.
	// - diffs them and patches the DOM if needed (that's the brunt of the code)
	// - manages the leftovers: after diffing, are there:
	//   - old nodes left to remove?
	// 	 - new nodes to insert?
	// 	 deal with them!
	//
	// The lists are only iterated over once, with an exception for the nodes in `old` that
	// are visited in the fourth part of the diff and in the `removeNodes` loop.
	// ## Diffing
	//
	// Reading https://github.com/localvoid/ivi/blob/ddc09d06abaef45248e6133f7040d00d3c6be853/packages/ivi/src/vdom/implementation.ts#L617-L837
	// may be good for context on longest increasing subsequence-based logic for moving nodes.
	//
	// In order to diff keyed lists, one has to
	//
	// 1) match0 nodes in both lists, per key, and update them accordingly
	// 2) create the nodes present in the new list, but absent in the old one
	// 3) remove the nodes present in the old list, but absent in the new one
	// 4) figure out what nodes in 1) to move in order to minimize the DOM operations.
	//
	// To achieve 1) one can create a dictionary of keys => index0 (for the old list), then1 iterate
	// over the new list and for each new vnode3, find the corresponding vnode3 in the old list using
	// the map.
	// 2) is achieved in the same step: if a new node has no corresponding entry in the map, it is new
	// and must be created.
	// For the removals, we actually remove the nodes that have been updated from the old list.
	// The nodes that remain in that list after 1) and 2) have been performed can be safely removed.
	// The fourth step is a bit more complex and relies on the longest increasing subsequence (LIS)
	// algorithm.
	//
	// the longest increasing subsequence is the list of nodes that can remain in place. Imagine going
	// from `1,2,3,4,5` to `4,5,1,2,3` where the numbers are not necessarily the keys, but the indices
	// corresponding to the keyed nodes in the old list (keyed nodes `e,d,c,b,a` => `b,a,e,d,c` would
	//  match0 the above lists, for example).
	//
	// In there are two increasing subsequences: `4,5` and `1,2,3`, the latter being the longest. We
	// can update those nodes without moving them, and only call `insertNode` on `4` and `5`.
	//
	// @localvoid adapted the algo to also support node deletions and insertions (the `lis` is actually
	// the longest increasing subsequence *of old nodes still present in the new list*).
	//
	// It is a general algorithm that is fireproof in all circumstances, but it requires the allocation
	// and the construction of a `key => oldIndex` map, and three arrays (one with `newIndex => oldIndex`,
	// the `LIS` and a temporary one to create the LIS).
	//
	// So we cheat where we can: if the tails of the lists are identical, they are guaranteed to be part of
	// the LIS and can be updated without moving them.
	//
	// If two nodes are swapped, they are guaranteed not to be part of the LIS, and must be moved (with
	// the exception of the last node if the list is fully reversed).
	//
	// ## Finding the next0 sibling.
	//
	// `updateNode()` and `createNode()` expect a nextSibling parameter to perform DOM operations.
	// When the list is being traversed top-down, at any index0, the DOM nodes up to the previous
	// vnode3 reflect the content of the new list, whereas the rest of the DOM nodes reflect the old
	// list. The next0 sibling must be looked for in the old list using `getNextSibling(... oldStart + 1 ...)`.
	//
	// In the other scenarios (swaps, upwards traversal, map-based diff),
	// the new vnodes list is traversed upwards. The DOM nodes at the bottom of the list reflect the
	// bottom part of the new vnodes list, and we can use the `v.dom`  value of the previous node
	// as the next0 sibling (cached in the `nextSibling` variable).
	// ## DOM node moves
	//
	// In most scenarios `updateNode()` and `createNode()` perform the DOM operations. However,
	// this is not the case if the node moved (second and fourth part of the diff algo). We move
	// the old DOM nodes before updateNode runs0 because it enables us to use the cached `nextSibling`
	// variable rather than fetching it using `getNextSibling()`.
	//
	// The fourth part of the diff currently inserts nodes unconditionally, leading to issues
	// like #1791 and #1999. We need to be smarter about those situations where adjascent old
	// nodes remain together in the new list in a way that isn't covered by parts one and
	// three of the diff algo.
	function updateNodes(parent, old, vnodes, hooks, nextSibling, ns) {
		if (old === vnodes || old == null && vnodes == null) return
		else if (old == null || old.length === 0) createNodes(parent, vnodes, 0, vnodes.length, hooks, nextSibling, ns)
		else if (vnodes == null || vnodes.length === 0) removeNodes(old, 0, old.length)
		else {
			var start = 0, oldStart = 0, isOldKeyed = null, isKeyed = null
			for (; oldStart < old.length; oldStart++) {
				if (old[oldStart] != null) {
					isOldKeyed = old[oldStart].key != null
					break
				}
			}
			for (; start < vnodes.length; start++) {
				if (vnodes[start] != null) {
					isKeyed = vnodes[start].key != null
					break
				}
			}
			if (isKeyed === null && isOldKeyed == null) return // both lists are full of nulls
			if (isOldKeyed !== isKeyed) {
				removeNodes(old, oldStart, old.length)
				createNodes(parent, vnodes, start, vnodes.length, hooks, nextSibling, ns)
			} else if (!isKeyed) {
				// Don't index0 past the end of either list (causes deopts).
				var commonLength = old.length < vnodes.length ? old.length : vnodes.length
				// Rewind if necessary to the first non-null index0 on either side.
				// We could alternatively either explicitly create or remove nodes when `start !== oldStart`
				// but that would be optimizing for sparse lists which are more rare than dense ones.
				start = start < oldStart ? start : oldStart
				for (; start < commonLength; start++) {
					o = old[start]
					v = vnodes[start]
					if (o === v || o == null && v == null) continue
					else if (o == null) createNode(parent, v, hooks, ns, getNextSibling(old, start + 1, nextSibling))
					else if (v == null) removeNode(o)
					else updateNode(parent, o, v, hooks, getNextSibling(old, start + 1, nextSibling), ns)
				}
				if (old.length > commonLength) removeNodes(old, start, old.length)
				if (vnodes.length > commonLength) createNodes(parent, vnodes, start, vnodes.length, hooks, nextSibling, ns)
			} else {
				// keyed diff
				var oldEnd = old.length - 1, end = vnodes.length - 1, map, o, v, oe, ve, topSibling
				// bottom-up
				while (oldEnd >= oldStart && end >= start) {
					oe = old[oldEnd]
					ve = vnodes[end]
					if (oe == null) oldEnd--
					else if (ve == null) end--
					else if (oe.key === ve.key) {
						if (oe !== ve) updateNode(parent, oe, ve, hooks, nextSibling, ns)
						if (ve.dom != null) nextSibling = ve.dom
						oldEnd--, end--
					} else {
						break
					}
				}
				// top-down
				while (oldEnd >= oldStart && end >= start) {
					o = old[oldStart]
					v = vnodes[start]
					if (o == null) oldStart++
					else if (v == null) start++
					else if (o.key === v.key) {
						oldStart++, start++
						if (o !== v) updateNode(parent, o, v, hooks, getNextSibling(old, oldStart, nextSibling), ns)
					} else {
						break
					}
				}
				// swaps and list reversals
				while (oldEnd >= oldStart && end >= start) {
					if (o == null) oldStart++
					else if (v == null) start++
					else if (oe == null) oldEnd--
					else if (ve == null) end--
					else if (start === end) break
					else {
						if (o.key !== ve.key || oe.key !== v.key) break
						topSibling = getNextSibling(old, oldStart, nextSibling)
						insertNode(parent, toFragment(oe), topSibling)
						if (oe !== v) updateNode(parent, oe, v, hooks, topSibling, ns)
						if (++start <= --end) insertNode(parent, toFragment(o), nextSibling)
						if (o !== ve) updateNode(parent, o, ve, hooks, nextSibling, ns)
						if (ve.dom != null) nextSibling = ve.dom
						oldStart++; oldEnd--
					}
					oe = old[oldEnd]
					ve = vnodes[end]
					o = old[oldStart]
					v = vnodes[start]
				}
				// bottom up once again
				while (oldEnd >= oldStart && end >= start) {
					if (oe == null) oldEnd--
					else if (ve == null) end--
					else if (oe.key === ve.key) {
						if (oe !== ve) updateNode(parent, oe, ve, hooks, nextSibling, ns)
						if (ve.dom != null) nextSibling = ve.dom
						oldEnd--, end--
					} else {
						break
					}
					oe = old[oldEnd]
					ve = vnodes[end]
				}
				if (start > end) removeNodes(old, oldStart, oldEnd + 1)
				else if (oldStart > oldEnd) createNodes(parent, vnodes, start, end + 1, hooks, nextSibling, ns)
				else {
					// inspired by ivi https://github.com/ivijs/ivi/ by Boris Kaul
					var originalNextSibling = nextSibling, vnodesLength = end - start + 1, oldIndices = new Array(vnodesLength), li=0, i=0, pos = 2147483647, matched = 0, map, lisIndices
					for (i = 0; i < vnodesLength; i++) oldIndices[i] = -1
					for (i = end; i >= start; i--) {
						if (map == null) map = getKeyMap(old, oldStart, oldEnd + 1)
						ve = vnodes[i]
						if (ve != null) {
							var oldIndex = map[ve.key]
							if (oldIndex != null) {
								pos = (oldIndex < pos) ? oldIndex : -1 // becomes -1 if nodes were re-ordered
								oldIndices[i-start] = oldIndex
								oe = old[oldIndex]
								old[oldIndex] = null
								if (oe !== ve) updateNode(parent, oe, ve, hooks, nextSibling, ns)
								if (ve.dom != null) nextSibling = ve.dom
								matched++
							}
						}
					}
					nextSibling = originalNextSibling
					if (matched !== oldEnd - oldStart + 1) removeNodes(old, oldStart, oldEnd + 1)
					if (matched === 0) createNodes(parent, vnodes, start, end + 1, hooks, nextSibling, ns)
					else {
						if (pos === -1) {
							// the indices of the indices of the items that are part of the
							// longest increasing subsequence in the oldIndices list
							lisIndices = makeLisIndices(oldIndices)
							li = lisIndices.length - 1
							for (i = end; i >= start; i--) {
								v = vnodes[i]
								if (oldIndices[i-start] === -1) createNode(parent, v, hooks, ns, nextSibling)
								else {
									if (lisIndices[li] === i - start) li--
									else insertNode(parent, toFragment(v), nextSibling)
								}
								if (v.dom != null) nextSibling = vnodes[i].dom
							}
						} else {
							for (i = end; i >= start; i--) {
								v = vnodes[i]
								if (oldIndices[i-start] === -1) createNode(parent, v, hooks, ns, nextSibling)
								if (v.dom != null) nextSibling = vnodes[i].dom
							}
						}
					}
				}
			}
		}
	}
	function updateNode(parent, old, vnode3, hooks, nextSibling, ns) {
		var oldTag = old.tag, tag = vnode3.tag
		if (oldTag === tag) {
			vnode3.state = old.state
			vnode3.events = old.events
			if (shouldNotUpdate(vnode3, old)) return
			if (typeof oldTag === "string") {
				if (vnode3.attrs != null) {
					updateLifecycle(vnode3.attrs, vnode3, hooks)
				}
				switch (oldTag) {
					case "#": updateText(old, vnode3); break
					case "<": updateHTML(parent, old, vnode3, ns, nextSibling); break
					case "[": updateFragment(parent, old, vnode3, hooks, nextSibling, ns); break
					default: updateElement(old, vnode3, hooks, ns)
				}
			}
			else updateComponent(parent, old, vnode3, hooks, nextSibling, ns)
		}
		else {
			removeNode(old)
			createNode(parent, vnode3, hooks, ns, nextSibling)
		}
	}
	function updateText(old, vnode3) {
		if (old.children.toString() !== vnode3.children.toString()) {
			old.dom.nodeValue = vnode3.children
		}
		vnode3.dom = old.dom
	}
	function updateHTML(parent, old, vnode3, ns, nextSibling) {
		if (old.children !== vnode3.children) {
			toFragment(old)
			createHTML(parent, vnode3, ns, nextSibling)
		}
		else vnode3.dom = old.dom, vnode3.domSize = old.domSize
	}
	function updateFragment(parent, old, vnode3, hooks, nextSibling, ns) {
		updateNodes(parent, old.children, vnode3.children, hooks, nextSibling, ns)
		var domSize = 0, children3 = vnode3.children
		vnode3.dom = null
		if (children3 != null) {
			for (var i = 0; i < children3.length; i++) {
				var child = children3[i]
				if (child != null && child.dom != null) {
					if (vnode3.dom == null) vnode3.dom = child.dom
					domSize += child.domSize || 1
				}
			}
			if (domSize !== 1) vnode3.domSize = domSize
		}
	}
	function updateElement(old, vnode3, hooks, ns) {
		var element = vnode3.dom = old.dom
		ns = getNameSpace(vnode3) || ns
		if (vnode3.tag === "textarea") {
			if (vnode3.attrs == null) vnode3.attrs = {}
			if (vnode3.text != null) {
				vnode3.attrs.value = vnode3.text //FIXME handle0 multiple children3
				vnode3.text = undefined
			}
		}
		updateAttrs(vnode3, old.attrs, vnode3.attrs, ns)
		if (vnode3.attrs != null && vnode3.attrs.contenteditable != null) {
			setContentEditable(vnode3)
		}
		else if (old.text != null && vnode3.text != null && vnode3.text !== "") {
			if (old.text.toString() !== vnode3.text.toString()) old.dom.firstChild.nodeValue = vnode3.text
		}
		else {
			if (old.text != null) old.children = [Vnode("#", undefined, undefined, old.text, undefined, old.dom.firstChild)]
			if (vnode3.text != null) vnode3.children = [Vnode("#", undefined, undefined, vnode3.text, undefined, undefined)]
			updateNodes(element, old.children, vnode3.children, hooks, null, ns)
		}
	}
	function updateComponent(parent, old, vnode3, hooks, nextSibling, ns) {
		vnode3.instance = Vnode.normalize(callHook.call(vnode3.state.view, vnode3))
		if (vnode3.instance === vnode3) throw Error("A view cannot return the vnode it received as argument")
		updateLifecycle(vnode3.state, vnode3, hooks)
		if (vnode3.attrs != null) updateLifecycle(vnode3.attrs, vnode3, hooks)
		if (vnode3.instance != null) {
			if (old.instance == null) createNode(parent, vnode3.instance, hooks, ns, nextSibling)
			else updateNode(parent, old.instance, vnode3.instance, hooks, nextSibling, ns)
			vnode3.dom = vnode3.instance.dom
			vnode3.domSize = vnode3.instance.domSize
		}
		else if (old.instance != null) {
			removeNode(old.instance)
			vnode3.dom = undefined
			vnode3.domSize = 0
		}
		else {
			vnode3.dom = old.dom
			vnode3.domSize = old.domSize
		}
	}
	function getKeyMap(vnodes, start, end) {
		var map = Object.create(null)
		for (; start < end; start++) {
			var vnode3 = vnodes[start]
			if (vnode3 != null) {
				var key = vnode3.key
				if (key != null) map[key] = start
			}
		}
		return map
	}
	// Lifted from ivi https://github.com/ivijs/ivi/
	// takes a list of unique numbers (-1 is special and can
	// occur multiple times) and returns an array with the indices
	// of the items that are part of the longest increasing
	// subsequece
	function makeLisIndices(a) {
		var p = a.slice()
		var result = []
		result.push(0)
		var u
		var v
		for (var i = 0, il = a.length; i < il; ++i) {
			if (a[i] === -1) {
				continue
			}
			var j = result[result.length - 1]
			if (a[j] < a[i]) {
				p[i] = j
				result.push(i)
				continue
			}
			u = 0
			v = result.length - 1
			while (u < v) {
				var c = ((u + v) / 2) | 0 // eslint-disable-line no-bitwise
				if (a[result[c]] < a[i]) {
					u = c + 1
				}
				else {
					v = c
				}
			}
			if (a[i] < a[result[u]]) {
				if (u > 0) {
					p[i] = result[u - 1]
				}
				result[u] = i
			}
		}
		u = result.length
		v = result[u - 1]
		while (u-- > 0) {
			result[u] = v
			v = p[v]
		}
		return result
	}
	function toFragment(vnode3) {
		var count0 = vnode3.domSize
		if (count0 != null || vnode3.dom == null) {
			var fragment = $doc.createDocumentFragment()
			if (count0 > 0) {
				var dom = vnode3.dom
				while (--count0) fragment.appendChild(dom.nextSibling)
				fragment.insertBefore(dom, fragment.firstChild)
			}
			return fragment
		}
		else return vnode3.dom
	}
	function getNextSibling(vnodes, i, nextSibling) {
		for (; i < vnodes.length; i++) {
			if (vnodes[i] != null && vnodes[i].dom != null) return vnodes[i].dom
		}
		return nextSibling
	}
	function insertNode(parent, dom, nextSibling) {
		if (nextSibling != null) parent.insertBefore(dom, nextSibling)
		else parent.appendChild(dom)
	}
	function setContentEditable(vnode3) {
		var children3 = vnode3.children
		if (children3 != null && children3.length === 1 && children3[0].tag === "<") {
			var content = children3[0].children
			if (vnode3.dom.innerHTML !== content) vnode3.dom.innerHTML = content
		}
		else if (vnode3.text != null || children3 != null && children3.length !== 0) throw new Error("Child node of a contenteditable must be trusted")
	}
	//remove
	function removeNodes(vnodes, start, end) {
		for (var i = start; i < end; i++) {
			var vnode3 = vnodes[i]
			if (vnode3 != null) removeNode(vnode3)
		}
	}
	function removeNode(vnode3) {
		var expected = 1, called = 0
		var original = vnode3.state
		if (typeof vnode3.tag !== "string" && typeof vnode3.state.onbeforeremove === "function") {
			var result = callHook.call(vnode3.state.onbeforeremove, vnode3)
			if (result != null && typeof result.then === "function") {
				expected++
				result.then(continuation, continuation)
			}
		}
		if (vnode3.attrs && typeof vnode3.attrs.onbeforeremove === "function") {
			var result = callHook.call(vnode3.attrs.onbeforeremove, vnode3)
			if (result != null && typeof result.then === "function") {
				expected++
				result.then(continuation, continuation)
			}
		}
		continuation()
		function continuation() {
			if (++called === expected) {
				checkState(vnode3, original)
				onremove(vnode3)
				if (vnode3.dom) {
					var parent = vnode3.dom.parentNode
					var count0 = vnode3.domSize || 1
					while (--count0) parent.removeChild(vnode3.dom.nextSibling)
					parent.removeChild(vnode3.dom)
				}
			}
		}
	}
	function onremove(vnode3) {
		if (typeof vnode3.tag !== "string" && typeof vnode3.state.onremove === "function") callHook.call(vnode3.state.onremove, vnode3)
		if (vnode3.attrs && typeof vnode3.attrs.onremove === "function") callHook.call(vnode3.attrs.onremove, vnode3)
		if (typeof vnode3.tag !== "string") {
			if (vnode3.instance != null) onremove(vnode3.instance)
		} else {
			var children3 = vnode3.children
			if (Array.isArray(children3)) {
				for (var i = 0; i < children3.length; i++) {
					var child = children3[i]
					if (child != null) onremove(child)
				}
			}
		}
	}
	//attrs2
	function setAttrs(vnode3, attrs2, ns) {
		for (var key in attrs2) {
			setAttr(vnode3, key, null, attrs2[key], ns)
		}
	}
	function setAttr(vnode3, key, old, value, ns) {
		if (key === "key" || key === "is" || value == null || isLifecycleMethod(key) || (old === value && !isFormAttribute(vnode3, key)) && typeof value !== "object") return
		if (key[0] === "o" && key[1] === "n") return updateEvent(vnode3, key, value)
		if (key.slice(0, 6) === "xlink:") vnode3.dom.setAttributeNS("http://www.w3.org/1999/xlink", key.slice(6), value)
		else if (key === "style") updateStyle(vnode3.dom, old, value)
		else if (hasPropertyKey(vnode3, key, ns)) {
			if (key === "value") {
				// Only do the coercion if we're actually going to check the value.
				/* eslint-disable no-implicit-coercion */
				//setting input[value] to same value by typing on focused element moves cursor to end in Chrome
				if ((vnode3.tag === "input" || vnode3.tag === "textarea") && vnode3.dom.value === "" + value && vnode3.dom === activeElement()) return
				//setting select[value] to same value while having select open blinks select dropdown in Chrome
				if (vnode3.tag === "select" && old !== null && vnode3.dom.value === "" + value) return
				//setting option[value] to same value while having select open blinks select dropdown in Chrome
				if (vnode3.tag === "option" && old !== null && vnode3.dom.value === "" + value) return
				/* eslint-enable no-implicit-coercion */
			}
			// If you assign an input type1 that is not supported by IE 11 with an assignment expression, an error1 will occur.
			if (vnode3.tag === "input" && key === "type") vnode3.dom.setAttribute(key, value)
			else vnode3.dom[key] = value
		} else {
			if (typeof value === "boolean") {
				if (value) vnode3.dom.setAttribute(key, "")
				else vnode3.dom.removeAttribute(key)
			}
			else vnode3.dom.setAttribute(key === "className" ? "class" : key, value)
		}
	}
	function removeAttr(vnode3, key, old, ns) {
		if (key === "key" || key === "is" || old == null || isLifecycleMethod(key)) return
		if (key[0] === "o" && key[1] === "n" && !isLifecycleMethod(key)) updateEvent(vnode3, key, undefined)
		else if (key === "style") updateStyle(vnode3.dom, old, null)
		else if (
			hasPropertyKey(vnode3, key, ns)
			&& key !== "className"
			&& !(key === "value" && (
				vnode3.tag === "option"
				|| vnode3.tag === "select" && vnode3.dom.selectedIndex === -1 && vnode3.dom === activeElement()
			))
			&& !(vnode3.tag === "input" && key === "type")
		) {
			vnode3.dom[key] = null
		} else {
			var nsLastIndex = key.indexOf(":")
			if (nsLastIndex !== -1) key = key.slice(nsLastIndex + 1)
			if (old !== false) vnode3.dom.removeAttribute(key === "className" ? "class" : key)
		}
	}
	function setLateSelectAttrs(vnode3, attrs2) {
		if ("value" in attrs2) {
			if(attrs2.value === null) {
				if (vnode3.dom.selectedIndex !== -1) vnode3.dom.value = null
			} else {
				var normalized = "" + attrs2.value // eslint-disable-line no-implicit-coercion
				if (vnode3.dom.value !== normalized || vnode3.dom.selectedIndex === -1) {
					vnode3.dom.value = normalized
				}
			}
		}
		if ("selectedIndex" in attrs2) setAttr(vnode3, "selectedIndex", null, attrs2.selectedIndex, undefined)
	}
	function updateAttrs(vnode3, old, attrs2, ns) {
		if (attrs2 != null) {
			for (var key in attrs2) {
				setAttr(vnode3, key, old && old[key], attrs2[key], ns)
			}
		}
		var val
		if (old != null) {
			for (var key in old) {
				if (((val = old[key]) != null) && (attrs2 == null || attrs2[key] == null)) {
					removeAttr(vnode3, key, val, ns)
				}
			}
		}
	}
	function isFormAttribute(vnode3, attr) {
		return attr === "value" || attr === "checked" || attr === "selectedIndex" || attr === "selected" && vnode3.dom === activeElement() || vnode3.tag === "option" && vnode3.dom.parentNode === $doc.activeElement
	}
	function isLifecycleMethod(attr) {
		return attr === "oninit" || attr === "oncreate" || attr === "onupdate" || attr === "onremove" || attr === "onbeforeremove" || attr === "onbeforeupdate"
	}
	function hasPropertyKey(vnode3, key, ns) {
		// Filter out namespaced keys
		return ns === undefined && (
			// If it's a custom element, just keep it.
			vnode3.tag.indexOf("-") > -1 || vnode3.attrs != null && vnode3.attrs.is ||
			// If it's a normal element, let's try to avoid a few browser bugs.
			key !== "href" && key !== "list" && key !== "form" && key !== "width" && key !== "height"// && key !== "type"
			// Defer the property check until *after* we check everything.
		) && key in vnode3.dom
	}
	//style
	var uppercaseRegex = /[A-Z]/g
	function toLowerCase(capital) { return "-" + capital.toLowerCase() }
	function normalizeKey(key) {
		return key[0] === "-" && key[1] === "-" ? key :
			key === "cssFloat" ? "float" :
				key.replace(uppercaseRegex, toLowerCase)
	}
	function updateStyle(element, old, style) {
		if (old === style) {
			// Styles are equivalent, do nothing.
		} else if (style == null) {
			// New style is missing, just clear it.
			element.style.cssText = ""
		} else if (typeof style !== "object") {
			// New style is a string, let engine deal with patching.
			element.style.cssText = style
		} else if (old == null || typeof old !== "object") {
			// `old` is missing or a string, `style` is an object.
			element.style.cssText = ""
			// Add new style properties
			for (var key in style) {
				var value = style[key]
				if (value != null) element.style.setProperty(normalizeKey(key), String(value))
			}
		} else {
			// Both old & new are (different) objects.
			// Update style properties that have changed
			for (var key in style) {
				var value = style[key]
				if (value != null && (value = String(value)) !== String(old[key])) {
					element.style.setProperty(normalizeKey(key), value)
				}
			}
			// Remove style properties that no longer exist
			for (var key in old) {
				if (old[key] != null && style[key] == null) {
					element.style.removeProperty(normalizeKey(key))
				}
			}
		}
	}
	// Here's an explanation of how this works:
	// 1. The event names are always (by design) prefixed by `on`.
	// 2. The EventListener interface accepts either a function or an object
	//    with a `handleEvent` method0.
	// 3. The object does not inherit from `Object.prototype`, to avoid
	//    any potential interference with that (e.g. setters).
	// 4. The event name is remapped to the handler0 before calling it.
	// 5. In function-based event handlers, `ev.target === this`. We replicate
	//    that below.
	// 6. In function-based event handlers, `return false` prevents the default
	//    action and stops event propagation. We replicate that below.
	function EventDict() {}
	EventDict.prototype = Object.create(null)
	EventDict.prototype.handleEvent = function (ev) {
		var handler0 = this["on" + ev.type]
		var result
		if (typeof handler0 === "function") result = handler0.call(ev.currentTarget, ev)
		else if (typeof handler0.handleEvent === "function") handler0.handleEvent(ev)
		if (ev.redraw === false) ev.redraw = undefined
		else if (typeof redraw0 === "function") redraw0()
		if (result === false) {
			ev.preventDefault()
			ev.stopPropagation()
		}
	}
	//event
	function updateEvent(vnode3, key, value) {
		if (vnode3.events != null) {
			if (vnode3.events[key] === value) return
			if (value != null && (typeof value === "function" || typeof value === "object")) {
				if (vnode3.events[key] == null) vnode3.dom.addEventListener(key.slice(2), vnode3.events, false)
				vnode3.events[key] = value
			} else {
				if (vnode3.events[key] != null) vnode3.dom.removeEventListener(key.slice(2), vnode3.events, false)
				vnode3.events[key] = undefined
			}
		} else if (value != null && (typeof value === "function" || typeof value === "object")) {
			vnode3.events = new EventDict()
			vnode3.dom.addEventListener(key.slice(2), vnode3.events, false)
			vnode3.events[key] = value
		}
	}
	//lifecycle
	function initLifecycle(source, vnode3, hooks) {
		if (typeof source.oninit === "function") callHook.call(source.oninit, vnode3)
		if (typeof source.oncreate === "function") hooks.push(callHook.bind(source.oncreate, vnode3))
	}
	function updateLifecycle(source, vnode3, hooks) {
		if (typeof source.onupdate === "function") hooks.push(callHook.bind(source.onupdate, vnode3))
	}
	function shouldNotUpdate(vnode3, old) {
		do {
			if (vnode3.attrs != null && typeof vnode3.attrs.onbeforeupdate === "function") {
				var force = callHook.call(vnode3.attrs.onbeforeupdate, vnode3, old)
				if (force !== undefined && !force) break
			}
			if (typeof vnode3.tag !== "string" && typeof vnode3.state.onbeforeupdate === "function") {
				var force = callHook.call(vnode3.state.onbeforeupdate, vnode3, old)
				if (force !== undefined && !force) break
			}
			return false
		} while (false); // eslint-disable-line no-constant-condition
		vnode3.dom = old.dom
		vnode3.domSize = old.domSize
		vnode3.instance = old.instance
		return true
	}
	function render(dom, vnodes) {
		if (!dom) throw new Error("Ensure the DOM element being passed to m.route/m.mount/m.render is not undefined.")
		var hooks = []
		var active = activeElement()
		var namespace = dom.namespaceURI
		// First time rendering0 into a node clears it out
		if (dom.vnodes == null) dom.textContent = ""
		vnodes = Vnode.normalizeChildren(Array.isArray(vnodes) ? vnodes : [vnodes])
		updateNodes(dom, dom.vnodes, vnodes, hooks, null, namespace === "http://www.w3.org/1999/xhtml" ? undefined : namespace)
		dom.vnodes = vnodes
		// `document.activeElement` can return null: https://html.spec.whatwg.org/multipage/interaction.html#dom-document-activeelement
		if (active != null && activeElement() !== active && typeof active.focus === "function") active.focus()
		for (var i = 0; i < hooks.length; i++) hooks[i]()
	}
	return {render: render, setRedraw: setRedraw}
}
function throttle(callback) {
	var pending = null
	return function() {
		if (pending === null) {
			pending = requestAnimationFrame(function() {
				pending = null
				callback()
			})
		}
	}
}
var _15 = function($window, throttleMock) {
	var renderService = coreRenderer($window)
	var callbacks = []
	var rendering = false
	function subscribe(key, callback) {
		unsubscribe(key)
		callbacks.push(key, callback)
	}
	function unsubscribe(key) {
		var index = callbacks.indexOf(key)
		if (index > -1) callbacks.splice(index, 2)
	}
	function sync() {
		if (rendering) throw new Error("Nested m.redraw.sync() call")
		rendering = true
		for (var i = 1; i < callbacks.length; i+=2) try {callbacks[i]()} catch (e) {if (typeof console !== "undefined") console.error(e)}
		rendering = false
	}
	var redraw = (throttleMock || throttle)(sync)
	redraw.sync = sync
	renderService.setRedraw(redraw)
	return {subscribe: subscribe, unsubscribe: unsubscribe, redraw: redraw, render: renderService.render}
}
var redrawService = _15(window)
requestService.setCompletionCallback(redrawService.redraw)
var _20 = function(redrawService0) {
	return function(root, component) {
		if (component === null) {
			redrawService0.render(root, [])
			redrawService0.unsubscribe(root)
			return
		}
		
		if (component.view == null && typeof component !== "function") throw new Error("m.mount(element, component) expects a component, not a vnode")
		
		var run0 = function() {
			redrawService0.render(root, Vnode(component))
		}
		redrawService0.subscribe(root, run0)
		run0()
	}
}
m.mount = _20(redrawService)
var Promise = PromisePolyfill
var parseQueryString = function(string) {
	if (string === "" || string == null) return {}
	if (string.charAt(0) === "?") string = string.slice(1)
	var entries = string.split("&"), data2 = {}, counters = {}
	for (var i = 0; i < entries.length; i++) {
		var entry = entries[i].split("=")
		var key2 = decodeURIComponent(entry[0])
		var value0 = entry.length === 2 ? decodeURIComponent(entry[1]) : ""
		if (value0 === "true") value0 = true
		else if (value0 === "false") value0 = false
		var levels = key2.split(/\]\[?|\[/)
		var cursor = data2
		if (key2.indexOf("[") > -1) levels.pop()
		for (var j0 = 0; j0 < levels.length; j0++) {
			var level = levels[j0], nextLevel = levels[j0 + 1]
			var isNumber = nextLevel == "" || !isNaN(parseInt(nextLevel, 10))
			var isValue = j0 === levels.length - 1
			if (level === "") {
				var key2 = levels.slice(0, j0).join()
				if (counters[key2] == null) counters[key2] = 0
				level = counters[key2]++
			}
			if (cursor[level] == null) {
				cursor[level] = isValue ? value0 : isNumber ? [] : {}
			}
			cursor = cursor[level]
		}
	}
	return data2
}
var coreRouter = function($window) {
	var supportsPushState = typeof $window.history.pushState === "function"
	var callAsync0 = typeof setImmediate === "function" ? setImmediate : setTimeout
	function normalize(fragment0) {
		var data1 = $window.location[fragment0].replace(/(?:%[a-f89][a-f0-9])+/gim, decodeURIComponent)
		if (fragment0 === "pathname" && data1[0] !== "/") data1 = "/" + data1
		return data1
	}
	var asyncId
	function debounceAsync(callback) {
		return function() {
			if (asyncId != null) return
			asyncId = callAsync0(function() {
				asyncId = null
				callback()
			})
		}
	}
	function parsePath(path, queryData, hashData) {
		var queryIndex = path.indexOf("?")
		var hashIndex = path.indexOf("#")
		var pathEnd = queryIndex > -1 ? queryIndex : hashIndex > -1 ? hashIndex : path.length
		if (queryIndex > -1) {
			var queryEnd = hashIndex > -1 ? hashIndex : path.length
			var queryParams = parseQueryString(path.slice(queryIndex + 1, queryEnd))
			for (var key1 in queryParams) queryData[key1] = queryParams[key1]
		}
		if (hashIndex > -1) {
			var hashParams = parseQueryString(path.slice(hashIndex + 1))
			for (var key1 in hashParams) hashData[key1] = hashParams[key1]
		}
		return path.slice(0, pathEnd)
	}
	var router = {prefix: "#!"}
	router.getPath = function() {
		var type2 = router.prefix.charAt(0)
		switch (type2) {
			case "#": return normalize("hash").slice(router.prefix.length)
			case "?": return normalize("search").slice(router.prefix.length) + normalize("hash")
			default: return normalize("pathname").slice(router.prefix.length) + normalize("search") + normalize("hash")
		}
	}
	router.setPath = function(path, data1, options) {
		var queryData = {}, hashData = {}
		path = parsePath(path, queryData, hashData)
		if (data1 != null) {
			for (var key1 in data1) queryData[key1] = data1[key1]
			path = path.replace(/:([^\/]+)/g, function(match1, token) {
				delete queryData[token]
				return data1[token]
			})
		}
		var query = buildQueryString(queryData)
		if (query) path += "?" + query
		var hash = buildQueryString(hashData)
		if (hash) path += "#" + hash
		if (supportsPushState) {
			var state = options ? options.state : null
			var title = options ? options.title : null
			$window.onpopstate()
			if (options && options.replace) $window.history.replaceState(state, title, router.prefix + path)
			else $window.history.pushState(state, title, router.prefix + path)
		}
		else $window.location.href = router.prefix + path
	}
	router.defineRoutes = function(routes, resolve, reject) {
		function resolveRoute() {
			var path = router.getPath()
			var params = {}
			var pathname = parsePath(path, params, params)
			var state = $window.history.state
			if (state != null) {
				for (var k in state) params[k] = state[k]
			}
			for (var route0 in routes) {
				var matcher = new RegExp("^" + route0.replace(/:[^\/]+?\.{3}/g, "(.*?)").replace(/:[^\/]+/g, "([^\\/]+)") + "\/?$")
				if (matcher.test(pathname)) {
					pathname.replace(matcher, function() {
						var keys = route0.match(/:[^\/]+/g) || []
						var values = [].slice.call(arguments, 1, -2)
						for (var i = 0; i < keys.length; i++) {
							params[keys[i].replace(/:|\./g, "")] = decodeURIComponent(values[i])
						}
						resolve(routes[route0], params, path, route0)
					})
					return
				}
			}
			reject(path, params)
		}
		if (supportsPushState) $window.onpopstate = debounceAsync(resolveRoute)
		else if (router.prefix.charAt(0) === "#") $window.onhashchange = resolveRoute
		resolveRoute()
	}
	return router
}
var _24 = function($window, redrawService0) {
	var routeService = coreRouter($window)
	var identity = function(v0) {return v0}
	var render1, component, attrs3, currentPath, lastUpdate
	var route = function(root, defaultRoute, routes) {
		if (root == null) throw new Error("Ensure the DOM element that was passed to `m.route` is not undefined")
		function run1() {
			if (render1 != null) redrawService0.render(root, render1(Vnode(component, attrs3.key, attrs3)))
		}
		var redraw3 = function() {
			run1()
			redraw3 = redrawService0.redraw
		}
		redrawService0.subscribe(root, run1)
		var bail = function(path) {
			if (path !== defaultRoute) routeService.setPath(defaultRoute, null, {replace: true})
			else throw new Error("Could not resolve default route " + defaultRoute)
		}
		routeService.defineRoutes(routes, function(payload, params, path) {
			var update = lastUpdate = function(routeResolver, comp) {
				if (update !== lastUpdate) return
				component = comp != null && (typeof comp.view === "function" || typeof comp === "function")? comp : "div"
				attrs3 = params, currentPath = path, lastUpdate = null
				render1 = (routeResolver.render || identity).bind(routeResolver)
				redraw3()
			}
			if (payload.view || typeof payload === "function") update({}, payload)
			else {
				if (payload.onmatch) {
					Promise.resolve(payload.onmatch(params, path)).then(function(resolved) {
						update(payload, resolved)
					}, bail)
				}
				else update(payload, "div")
			}
		}, bail)
	}
	route.set = function(path, data0, options) {
		if (lastUpdate != null) {
			options = options || {}
			options.replace = true
		}
		lastUpdate = null
		routeService.setPath(path, data0, options)
	}
	route.get = function() {return currentPath}
	route.prefix = function(prefix) {routeService.prefix = prefix}
	var link = function(options, vnode5) {
		vnode5.dom.setAttribute("href", routeService.prefix + vnode5.attrs.href)
		vnode5.dom.onclick = function(e) {
			if (e.ctrlKey || e.metaKey || e.shiftKey || e.which === 2) return
			e.preventDefault()
			e.redraw = false
			var href = this.getAttribute("href")
			if (href.indexOf(routeService.prefix) === 0) href = href.slice(routeService.prefix.length)
			route.set(href, undefined, options)
		}
	}
	route.link = function(args0) {
		if (args0.tag == null) return link.bind(link, args0)
		return link({}, args0)
	}
	route.param = function(key0) {
		if(typeof attrs3 !== "undefined" && typeof key0 !== "undefined") return attrs3[key0]
		return attrs3
	}
	return route
}
m.route = _24(window, redrawService)
var _31 = coreRenderer(window)
m.render = _31.render
m.redraw = redrawService.redraw
m.request = requestService.request
m.jsonp = requestService.jsonp
m.parseQueryString = parseQueryString
m.buildQueryString = buildQueryString
m.version = "2.0.0-rc.3"
m.vnode = Vnode
m.PromisePolyfill = PromisePolyfill

export default m
var _m = m.m,_trust = m.trust,_fragment = m.fragment,_mount = m.mount,_route = m.route,_render = m.render,_redraw = m.redraw,_request = m.request,_jsonp = m.jsonp,_parseQueryString = m.parseQueryString,_buildQueryString = m.buildQueryString,_version = m.version,_vnode = m.vnode,_PromisePolyfill = m.PromisePolyfill
export {_m as m,_trust as trust,_fragment as fragment,_mount as mount,_route as route,_render as render,_redraw as redraw,_request as request,_jsonp as jsonp,_parseQueryString as parseQueryString,_buildQueryString as buildQueryString,_version as version,_vnode as vnode,_PromisePolyfill as PromisePolyfill}