coze_demo/socket/node_modules/preact/dist/preact.esm.js

/** Virtual DOM Node */
function VNode() {}

/** Global options
 *	@public
 *	@namespace options {Object}
 */
var options = {

	/** If `true`, `prop` changes trigger synchronous component updates.
  *	@name syncComponentUpdates
  *	@type Boolean
  *	@default true
  */
	//syncComponentUpdates: true,

	/** Processes all created VNodes.
  *	@param {VNode} vnode	A newly-created VNode to normalize/process
  */
	//vnode(vnode) { }

	/** Hook invoked after a component is mounted. */
	// afterMount(component) { }

	/** Hook invoked after the DOM is updated with a component's latest render. */
	// afterUpdate(component) { }

	/** Hook invoked immediately before a component is unmounted. */
	// beforeUnmount(component) { }
};

var stack = [];

var EMPTY_CHILDREN = [];

/**
 * JSX/hyperscript reviver.
 * @see http://jasonformat.com/wtf-is-jsx
 * Benchmarks: https://esbench.com/bench/57ee8f8e330ab09900a1a1a0
 *
 * Note: this is exported as both `h()` and `createElement()` for compatibility reasons.
 *
 * Creates a VNode (virtual DOM element). A tree of VNodes can be used as a lightweight representation
 * of the structure of a DOM tree. This structure can be realized by recursively comparing it against
 * the current _actual_ DOM structure, and applying only the differences.
 *
 * `h()`/`createElement()` accepts an element name, a list of attributes/props,
 * and optionally children to append to the element.
 *
 * @example The following DOM tree
 *
 * `<div id="foo" name="bar">Hello!</div>`
 *
 * can be constructed using this function as:
 *
 * `h('div', { id: 'foo', name : 'bar' }, 'Hello!');`
 *
 * @param {string} nodeName	An element name. Ex: `div`, `a`, `span`, etc.
 * @param {Object} attributes	Any attributes/props to set on the created element.
 * @param rest			Additional arguments are taken to be children to append. Can be infinitely nested Arrays.
 *
 * @public
 */
function h(nodeName, attributes) {
	var children = EMPTY_CHILDREN,
	    lastSimple,
	    child,
	    simple,
	    i;
	for (i = arguments.length; i-- > 2;) {
		stack.push(arguments[i]);
	}
	if (attributes && attributes.children != null) {
		if (!stack.length) stack.push(attributes.children);
		delete attributes.children;
	}
	while (stack.length) {
		if ((child = stack.pop()) && child.pop !== undefined) {
			for (i = child.length; i--;) {
				stack.push(child[i]);
			}
		} else {
			if (typeof child === 'boolean') child = null;

			if (simple = typeof nodeName !== 'function') {
				if (child == null) child = '';else if (typeof child === 'number') child = String(child);else if (typeof child !== 'string') simple = false;
			}

			if (simple && lastSimple) {
				children[children.length - 1] += child;
			} else if (children === EMPTY_CHILDREN) {
				children = [child];
			} else {
				children.push(child);
			}

			lastSimple = simple;
		}
	}

	var p = new VNode();
	p.nodeName = nodeName;
	p.children = children;
	p.attributes = attributes == null ? undefined : attributes;
	p.key = attributes == null ? undefined : attributes.key;

	// if a "vnode hook" is defined, pass every created VNode to it
	if (options.vnode !== undefined) options.vnode(p);

	return p;
}

/**
 *  Copy all properties from `props` onto `obj`.
 *  @param {Object} obj		Object onto which properties should be copied.
 *  @param {Object} props	Object from which to copy properties.
 *  @returns obj
 *  @private
 */
function extend(obj, props) {
  for (var i in props) {
    obj[i] = props[i];
  }return obj;
}

/**
 * Call a function asynchronously, as soon as possible. Makes
 * use of HTML Promise to schedule the callback if available,
 * otherwise falling back to `setTimeout` (mainly for IE<11).
 *
 * @param {Function} callback
 */
var defer = typeof Promise == 'function' ? Promise.resolve().then.bind(Promise.resolve()) : setTimeout;

/**
 * Clones the given VNode, optionally adding attributes/props and replacing its children.
 * @param {VNode} vnode		The virutal DOM element to clone
 * @param {Object} props	Attributes/props to add when cloning
 * @param {VNode} rest		Any additional arguments will be used as replacement children.
 */
function cloneElement(vnode, props) {
  return h(vnode.nodeName, extend(extend({}, vnode.attributes), props), arguments.length > 2 ? [].slice.call(arguments, 2) : vnode.children);
}

// DOM properties that should NOT have "px" added when numeric
var IS_NON_DIMENSIONAL = /acit|ex(?:s|g|n|p|$)|rph|ows|mnc|ntw|ine[ch]|zoo|^ord/i;

/** Managed queue of dirty components to be re-rendered */

var items = [];

function enqueueRender(component) {
	if (!component._dirty && (component._dirty = true) && items.push(component) == 1) {
		(options.debounceRendering || defer)(rerender);
	}
}

function rerender() {
	var p,
	    list = items;
	items = [];
	while (p = list.pop()) {
		if (p._dirty) renderComponent(p);
	}
}

/**
 * Check if two nodes are equivalent.
 *
 * @param {Node} node			DOM Node to compare
 * @param {VNode} vnode			Virtual DOM node to compare
 * @param {boolean} [hyrdating=false]	If true, ignores component constructors when comparing.
 * @private
 */
function isSameNodeType(node, vnode, hydrating) {
  if (typeof vnode === 'string' || typeof vnode === 'number') {
    return node.splitText !== undefined;
  }
  if (typeof vnode.nodeName === 'string') {
    return !node._componentConstructor && isNamedNode(node, vnode.nodeName);
  }
  return hydrating || node._componentConstructor === vnode.nodeName;
}

/**
 * Check if an Element has a given nodeName, case-insensitively.
 *
 * @param {Element} node	A DOM Element to inspect the name of.
 * @param {String} nodeName	Unnormalized name to compare against.
 */
function isNamedNode(node, nodeName) {
  return node.normalizedNodeName === nodeName || node.nodeName.toLowerCase() === nodeName.toLowerCase();
}

/**
 * Reconstruct Component-style `props` from a VNode.
 * Ensures default/fallback values from `defaultProps`:
 * Own-properties of `defaultProps` not present in `vnode.attributes` are added.
 *
 * @param {VNode} vnode
 * @returns {Object} props
 */
function getNodeProps(vnode) {
  var props = extend({}, vnode.attributes);
  props.children = vnode.children;

  var defaultProps = vnode.nodeName.defaultProps;
  if (defaultProps !== undefined) {
    for (var i in defaultProps) {
      if (props[i] === undefined) {
        props[i] = defaultProps[i];
      }
    }
  }

  return props;
}

/** Create an element with the given nodeName.
 *	@param {String} nodeName
 *	@param {Boolean} [isSvg=false]	If `true`, creates an element within the SVG namespace.
 *	@returns {Element} node
 */
function createNode(nodeName, isSvg) {
	var node = isSvg ? document.createElementNS('http://www.w3.org/2000/svg', nodeName) : document.createElement(nodeName);
	node.normalizedNodeName = nodeName;
	return node;
}

/** Remove a child node from its parent if attached.
 *	@param {Element} node		The node to remove
 */
function removeNode(node) {
	var parentNode = node.parentNode;
	if (parentNode) parentNode.removeChild(node);
}

/** Set a named attribute on the given Node, with special behavior for some names and event handlers.
 *	If `value` is `null`, the attribute/handler will be removed.
 *	@param {Element} node	An element to mutate
 *	@param {string} name	The name/key to set, such as an event or attribute name
 *	@param {any} old	The last value that was set for this name/node pair
 *	@param {any} value	An attribute value, such as a function to be used as an event handler
 *	@param {Boolean} isSvg	Are we currently diffing inside an svg?
 *	@private
 */
function setAccessor(node, name, old, value, isSvg) {
	if (name === 'className') name = 'class';

	if (name === 'key') {
		// ignore
	} else if (name === 'ref') {
		if (old) old(null);
		if (value) value(node);
	} else if (name === 'class' && !isSvg) {
		node.className = value || '';
	} else if (name === 'style') {
		if (!value || typeof value === 'string' || typeof old === 'string') {
			node.style.cssText = value || '';
		}
		if (value && typeof value === 'object') {
			if (typeof old !== 'string') {
				for (var i in old) {
					if (!(i in value)) node.style[i] = '';
				}
			}
			for (var i in value) {
				node.style[i] = typeof value[i] === 'number' && IS_NON_DIMENSIONAL.test(i) === false ? value[i] + 'px' : value[i];
			}
		}
	} else if (name === 'dangerouslySetInnerHTML') {
		if (value) node.innerHTML = value.__html || '';
	} else if (name[0] == 'o' && name[1] == 'n') {
		var useCapture = name !== (name = name.replace(/Capture$/, ''));
		name = name.toLowerCase().substring(2);
		if (value) {
			if (!old) node.addEventListener(name, eventProxy, useCapture);
		} else {
			node.removeEventListener(name, eventProxy, useCapture);
		}
		(node._listeners || (node._listeners = {}))[name] = value;
	} else if (name !== 'list' && name !== 'type' && !isSvg && name in node) {
		setProperty(node, name, value == null ? '' : value);
		if (value == null || value === false) node.removeAttribute(name);
	} else {
		var ns = isSvg && name !== (name = name.replace(/^xlink\:?/, ''));
		if (value == null || value === false) {
			if (ns) node.removeAttributeNS('http://www.w3.org/1999/xlink', name.toLowerCase());else node.removeAttribute(name);
		} else if (typeof value !== 'function') {
			if (ns) node.setAttributeNS('http://www.w3.org/1999/xlink', name.toLowerCase(), value);else node.setAttribute(name, value);
		}
	}
}

/** Attempt to set a DOM property to the given value.
 *	IE & FF throw for certain property-value combinations.
 */
function setProperty(node, name, value) {
	try {
		node[name] = value;
	} catch (e) {}
}

/** Proxy an event to hooked event handlers
 *	@private
 */
function eventProxy(e) {
	return this._listeners[e.type](options.event && options.event(e) || e);
}

/** Queue of components that have been mounted and are awaiting componentDidMount */
var mounts = [];

/** Diff recursion count, used to track the end of the diff cycle. */
var diffLevel = 0;

/** Global flag indicating if the diff is currently within an SVG */
var isSvgMode = false;

/** Global flag indicating if the diff is performing hydration */
var hydrating = false;

/** Invoke queued componentDidMount lifecycle methods */
function flushMounts() {
	var c;
	while (c = mounts.pop()) {
		if (options.afterMount) options.afterMount(c);
		if (c.componentDidMount) c.componentDidMount();
	}
}

/** Apply differences in a given vnode (and it's deep children) to a real DOM Node.
 *	@param {Element} [dom=null]		A DOM node to mutate into the shape of the `vnode`
 *	@param {VNode} vnode			A VNode (with descendants forming a tree) representing the desired DOM structure
 *	@returns {Element} dom			The created/mutated element
 *	@private
 */
function diff(dom, vnode, context, mountAll, parent, componentRoot) {
	// diffLevel having been 0 here indicates initial entry into the diff (not a subdiff)
	if (!diffLevel++) {
		// when first starting the diff, check if we're diffing an SVG or within an SVG
		isSvgMode = parent != null && parent.ownerSVGElement !== undefined;

		// hydration is indicated by the existing element to be diffed not having a prop cache
		hydrating = dom != null && !('__preactattr_' in dom);
	}

	var ret = idiff(dom, vnode, context, mountAll, componentRoot);

	// append the element if its a new parent
	if (parent && ret.parentNode !== parent) parent.appendChild(ret);

	// diffLevel being reduced to 0 means we're exiting the diff
	if (! --diffLevel) {
		hydrating = false;
		// invoke queued componentDidMount lifecycle methods
		if (!componentRoot) flushMounts();
	}

	return ret;
}

/** Internals of `diff()`, separated to allow bypassing diffLevel / mount flushing. */
function idiff(dom, vnode, context, mountAll, componentRoot) {
	var out = dom,
	    prevSvgMode = isSvgMode;

	// empty values (null, undefined, booleans) render as empty Text nodes
	if (vnode == null || typeof vnode === 'boolean') vnode = '';

	// Fast case: Strings & Numbers create/update Text nodes.
	if (typeof vnode === 'string' || typeof vnode === 'number') {

		// update if it's already a Text node:
		if (dom && dom.splitText !== undefined && dom.parentNode && (!dom._component || componentRoot)) {
			/* istanbul ignore if */ /* Browser quirk that can't be covered: https://github.com/developit/preact/commit/fd4f21f5c45dfd75151bd27b4c217d8003aa5eb9 */
			if (dom.nodeValue != vnode) {
				dom.nodeValue = vnode;
			}
		} else {
			// it wasn't a Text node: replace it with one and recycle the old Element
			out = document.createTextNode(vnode);
			if (dom) {
				if (dom.parentNode) dom.parentNode.replaceChild(out, dom);
				recollectNodeTree(dom, true);
			}
		}

		out['__preactattr_'] = true;

		return out;
	}

	// If the VNode represents a Component, perform a component diff:
	var vnodeName = vnode.nodeName;
	if (typeof vnodeName === 'function') {
		return buildComponentFromVNode(dom, vnode, context, mountAll);
	}

	// Tracks entering and exiting SVG namespace when descending through the tree.
	isSvgMode = vnodeName === 'svg' ? true : vnodeName === 'foreignObject' ? false : isSvgMode;

	// If there's no existing element or it's the wrong type, create a new one:
	vnodeName = String(vnodeName);
	if (!dom || !isNamedNode(dom, vnodeName)) {
		out = createNode(vnodeName, isSvgMode);

		if (dom) {
			// move children into the replacement node
			while (dom.firstChild) {
				out.appendChild(dom.firstChild);
			} // if the previous Element was mounted into the DOM, replace it inline
			if (dom.parentNode) dom.parentNode.replaceChild(out, dom);

			// recycle the old element (skips non-Element node types)
			recollectNodeTree(dom, true);
		}
	}

	var fc = out.firstChild,
	    props = out['__preactattr_'],
	    vchildren = vnode.children;

	if (props == null) {
		props = out['__preactattr_'] = {};
		for (var a = out.attributes, i = a.length; i--;) {
			props[a[i].name] = a[i].value;
		}
	}

	// Optimization: fast-path for elements containing a single TextNode:
	if (!hydrating && vchildren && vchildren.length === 1 && typeof vchildren[0] === 'string' && fc != null && fc.splitText !== undefined && fc.nextSibling == null) {
		if (fc.nodeValue != vchildren[0]) {
			fc.nodeValue = vchildren[0];
		}
	}
	// otherwise, if there are existing or new children, diff them:
	else if (vchildren && vchildren.length || fc != null) {
			innerDiffNode(out, vchildren, context, mountAll, hydrating || props.dangerouslySetInnerHTML != null);
		}

	// Apply attributes/props from VNode to the DOM Element:
	diffAttributes(out, vnode.attributes, props);

	// restore previous SVG mode: (in case we're exiting an SVG namespace)
	isSvgMode = prevSvgMode;

	return out;
}

/** Apply child and attribute changes between a VNode and a DOM Node to the DOM.
 *	@param {Element} dom			Element whose children should be compared & mutated
 *	@param {Array} vchildren		Array of VNodes to compare to `dom.childNodes`
 *	@param {Object} context			Implicitly descendant context object (from most recent `getChildContext()`)
 *	@param {Boolean} mountAll
 *	@param {Boolean} isHydrating	If `true`, consumes externally created elements similar to hydration
 */
function innerDiffNode(dom, vchildren, context, mountAll, isHydrating) {
	var originalChildren = dom.childNodes,
	    children = [],
	    keyed = {},
	    keyedLen = 0,
	    min = 0,
	    len = originalChildren.length,
	    childrenLen = 0,
	    vlen = vchildren ? vchildren.length : 0,
	    j,
	    c,
	    f,
	    vchild,
	    child;

	// Build up a map of keyed children and an Array of unkeyed children:
	if (len !== 0) {
		for (var i = 0; i < len; i++) {
			var _child = originalChildren[i],
			    props = _child['__preactattr_'],
			    key = vlen && props ? _child._component ? _child._component.__key : props.key : null;
			if (key != null) {
				keyedLen++;
				keyed[key] = _child;
			} else if (props || (_child.splitText !== undefined ? isHydrating ? _child.nodeValue.trim() : true : isHydrating)) {
				children[childrenLen++] = _child;
			}
		}
	}

	if (vlen !== 0) {
		for (var i = 0; i < vlen; i++) {
			vchild = vchildren[i];
			child = null;

			// attempt to find a node based on key matching
			var key = vchild.key;
			if (key != null) {
				if (keyedLen && keyed[key] !== undefined) {
					child = keyed[key];
					keyed[key] = undefined;
					keyedLen--;
				}
			}
			// attempt to pluck a node of the same type from the existing children
			else if (!child && min < childrenLen) {
					for (j = min; j < childrenLen; j++) {
						if (children[j] !== undefined && isSameNodeType(c = children[j], vchild, isHydrating)) {
							child = c;
							children[j] = undefined;
							if (j === childrenLen - 1) childrenLen--;
							if (j === min) min++;
							break;
						}
					}
				}

			// morph the matched/found/created DOM child to match vchild (deep)
			child = idiff(child, vchild, context, mountAll);

			f = originalChildren[i];
			if (child && child !== dom && child !== f) {
				if (f == null) {
					dom.appendChild(child);
				} else if (child === f.nextSibling) {
					removeNode(f);
				} else {
					dom.insertBefore(child, f);
				}
			}
		}
	}

	// remove unused keyed children:
	if (keyedLen) {
		for (var i in keyed) {
			if (keyed[i] !== undefined) recollectNodeTree(keyed[i], false);
		}
	}

	// remove orphaned unkeyed children:
	while (min <= childrenLen) {
		if ((child = children[childrenLen--]) !== undefined) recollectNodeTree(child, false);
	}
}

/** Recursively recycle (or just unmount) a node and its descendants.
 *	@param {Node} node						DOM node to start unmount/removal from
 *	@param {Boolean} [unmountOnly=false]	If `true`, only triggers unmount lifecycle, skips removal
 */
function recollectNodeTree(node, unmountOnly) {
	var component = node._component;
	if (component) {
		// if node is owned by a Component, unmount that component (ends up recursing back here)
		unmountComponent(component);
	} else {
		// If the node's VNode had a ref function, invoke it with null here.
		// (this is part of the React spec, and smart for unsetting references)
		if (node['__preactattr_'] != null && node['__preactattr_'].ref) node['__preactattr_'].ref(null);

		if (unmountOnly === false || node['__preactattr_'] == null) {
			removeNode(node);
		}

		removeChildren(node);
	}
}

/** Recollect/unmount all children.
 *	- we use .lastChild here because it causes less reflow than .firstChild
 *	- it's also cheaper than accessing the .childNodes Live NodeList
 */
function removeChildren(node) {
	node = node.lastChild;
	while (node) {
		var next = node.previousSibling;
		recollectNodeTree(node, true);
		node = next;
	}
}

/** Apply differences in attributes from a VNode to the given DOM Element.
 *	@param {Element} dom		Element with attributes to diff `attrs` against
 *	@param {Object} attrs		The desired end-state key-value attribute pairs
 *	@param {Object} old			Current/previous attributes (from previous VNode or element's prop cache)
 */
function diffAttributes(dom, attrs, old) {
	var name;

	// remove attributes no longer present on the vnode by setting them to undefined
	for (name in old) {
		if (!(attrs && attrs[name] != null) && old[name] != null) {
			setAccessor(dom, name, old[name], old[name] = undefined, isSvgMode);
		}
	}

	// add new & update changed attributes
	for (name in attrs) {
		if (name !== 'children' && name !== 'innerHTML' && (!(name in old) || attrs[name] !== (name === 'value' || name === 'checked' ? dom[name] : old[name]))) {
			setAccessor(dom, name, old[name], old[name] = attrs[name], isSvgMode);
		}
	}
}

/** Retains a pool of Components for re-use, keyed on component name.
 *	Note: since component names are not unique or even necessarily available, these are primarily a form of sharding.
 *	@private
 */
var components = {};

/** Reclaim a component for later re-use by the recycler. */
function collectComponent(component) {
	var name = component.constructor.name;
	(components[name] || (components[name] = [])).push(component);
}

/** Create a component. Normalizes differences between PFC's and classful Components. */
function createComponent(Ctor, props, context) {
	var list = components[Ctor.name],
	    inst;

	if (Ctor.prototype && Ctor.prototype.render) {
		inst = new Ctor(props, context);
		Component.call(inst, props, context);
	} else {
		inst = new Component(props, context);
		inst.constructor = Ctor;
		inst.render = doRender;
	}

	if (list) {
		for (var i = list.length; i--;) {
			if (list[i].constructor === Ctor) {
				inst.nextBase = list[i].nextBase;
				list.splice(i, 1);
				break;
			}
		}
	}
	return inst;
}

/** The `.render()` method for a PFC backing instance. */
function doRender(props, state, context) {
	return this.constructor(props, context);
}

/** Set a component's `props` (generally derived from JSX attributes).
 *	@param {Object} props
 *	@param {Object} [opts]
 *	@param {boolean} [opts.renderSync=false]	If `true` and {@link options.syncComponentUpdates} is `true`, triggers synchronous rendering.
 *	@param {boolean} [opts.render=true]			If `false`, no render will be triggered.
 */
function setComponentProps(component, props, opts, context, mountAll) {
	if (component._disable) return;
	component._disable = true;

	if (component.__ref = props.ref) delete props.ref;
	if (component.__key = props.key) delete props.key;

	if (!component.base || mountAll) {
		if (component.componentWillMount) component.componentWillMount();
	} else if (component.componentWillReceiveProps) {
		component.componentWillReceiveProps(props, context);
	}

	if (context && context !== component.context) {
		if (!component.prevContext) component.prevContext = component.context;
		component.context = context;
	}

	if (!component.prevProps) component.prevProps = component.props;
	component.props = props;

	component._disable = false;

	if (opts !== 0) {
		if (opts === 1 || options.syncComponentUpdates !== false || !component.base) {
			renderComponent(component, 1, mountAll);
		} else {
			enqueueRender(component);
		}
	}

	if (component.__ref) component.__ref(component);
}

/** Render a Component, triggering necessary lifecycle events and taking High-Order Components into account.
 *	@param {Component} component
 *	@param {Object} [opts]
 *	@param {boolean} [opts.build=false]		If `true`, component will build and store a DOM node if not already associated with one.
 *	@private
 */
function renderComponent(component, opts, mountAll, isChild) {
	if (component._disable) return;

	var props = component.props,
	    state = component.state,
	    context = component.context,
	    previousProps = component.prevProps || props,
	    previousState = component.prevState || state,
	    previousContext = component.prevContext || context,
	    isUpdate = component.base,
	    nextBase = component.nextBase,
	    initialBase = isUpdate || nextBase,
	    initialChildComponent = component._component,
	    skip = false,
	    rendered,
	    inst,
	    cbase;

	// if updating
	if (isUpdate) {
		component.props = previousProps;
		component.state = previousState;
		component.context = previousContext;
		if (opts !== 2 && component.shouldComponentUpdate && component.shouldComponentUpdate(props, state, context) === false) {
			skip = true;
		} else if (component.componentWillUpdate) {
			component.componentWillUpdate(props, state, context);
		}
		component.props = props;
		component.state = state;
		component.context = context;
	}

	component.prevProps = component.prevState = component.prevContext = component.nextBase = null;
	component._dirty = false;

	if (!skip) {
		rendered = component.render(props, state, context);

		// context to pass to the child, can be updated via (grand-)parent component
		if (component.getChildContext) {
			context = extend(extend({}, context), component.getChildContext());
		}

		var childComponent = rendered && rendered.nodeName,
		    toUnmount,
		    base;

		if (typeof childComponent === 'function') {
			// set up high order component link

			var childProps = getNodeProps(rendered);
			inst = initialChildComponent;

			if (inst && inst.constructor === childComponent && childProps.key == inst.__key) {
				setComponentProps(inst, childProps, 1, context, false);
			} else {
				toUnmount = inst;

				component._component = inst = createComponent(childComponent, childProps, context);
				inst.nextBase = inst.nextBase || nextBase;
				inst._parentComponent = component;
				setComponentProps(inst, childProps, 0, context, false);
				renderComponent(inst, 1, mountAll, true);
			}

			base = inst.base;
		} else {
			cbase = initialBase;

			// destroy high order component link
			toUnmount = initialChildComponent;
			if (toUnmount) {
				cbase = component._component = null;
			}

			if (initialBase || opts === 1) {
				if (cbase) cbase._component = null;
				base = diff(cbase, rendered, context, mountAll || !isUpdate, initialBase && initialBase.parentNode, true);
			}
		}

		if (initialBase && base !== initialBase && inst !== initialChildComponent) {
			var baseParent = initialBase.parentNode;
			if (baseParent && base !== baseParent) {
				baseParent.replaceChild(base, initialBase);

				if (!toUnmount) {
					initialBase._component = null;
					recollectNodeTree(initialBase, false);
				}
			}
		}

		if (toUnmount) {
			unmountComponent(toUnmount);
		}

		component.base = base;
		if (base && !isChild) {
			var componentRef = component,
			    t = component;
			while (t = t._parentComponent) {
				(componentRef = t).base = base;
			}
			base._component = componentRef;
			base._componentConstructor = componentRef.constructor;
		}
	}

	if (!isUpdate || mountAll) {
		mounts.unshift(component);
	} else if (!skip) {
		// Ensure that pending componentDidMount() hooks of child components
		// are called before the componentDidUpdate() hook in the parent.
		// Note: disabled as it causes duplicate hooks, see https://github.com/developit/preact/issues/750
		// flushMounts();

		if (component.componentDidUpdate) {
			component.componentDidUpdate(previousProps, previousState, previousContext);
		}
		if (options.afterUpdate) options.afterUpdate(component);
	}

	if (component._renderCallbacks != null) {
		while (component._renderCallbacks.length) {
			component._renderCallbacks.pop().call(component);
		}
	}

	if (!diffLevel && !isChild) flushMounts();
}

/** Apply the Component referenced by a VNode to the DOM.
 *	@param {Element} dom	The DOM node to mutate
 *	@param {VNode} vnode	A Component-referencing VNode
 *	@returns {Element} dom	The created/mutated element
 *	@private
 */
function buildComponentFromVNode(dom, vnode, context, mountAll) {
	var c = dom && dom._component,
	    originalComponent = c,
	    oldDom = dom,
	    isDirectOwner = c && dom._componentConstructor === vnode.nodeName,
	    isOwner = isDirectOwner,
	    props = getNodeProps(vnode);
	while (c && !isOwner && (c = c._parentComponent)) {
		isOwner = c.constructor === vnode.nodeName;
	}

	if (c && isOwner && (!mountAll || c._component)) {
		setComponentProps(c, props, 3, context, mountAll);
		dom = c.base;
	} else {
		if (originalComponent && !isDirectOwner) {
			unmountComponent(originalComponent);
			dom = oldDom = null;
		}

		c = createComponent(vnode.nodeName, props, context);
		if (dom && !c.nextBase) {
			c.nextBase = dom;
			// passing dom/oldDom as nextBase will recycle it if unused, so bypass recycling on L229:
			oldDom = null;
		}
		setComponentProps(c, props, 1, context, mountAll);
		dom = c.base;

		if (oldDom && dom !== oldDom) {
			oldDom._component = null;
			recollectNodeTree(oldDom, false);
		}
	}

	return dom;
}

/** Remove a component from the DOM and recycle it.
 *	@param {Component} component	The Component instance to unmount
 *	@private
 */
function unmountComponent(component) {
	if (options.beforeUnmount) options.beforeUnmount(component);

	var base = component.base;

	component._disable = true;

	if (component.componentWillUnmount) component.componentWillUnmount();

	component.base = null;

	// recursively tear down & recollect high-order component children:
	var inner = component._component;
	if (inner) {
		unmountComponent(inner);
	} else if (base) {
		if (base['__preactattr_'] && base['__preactattr_'].ref) base['__preactattr_'].ref(null);

		component.nextBase = base;

		removeNode(base);
		collectComponent(component);

		removeChildren(base);
	}

	if (component.__ref) component.__ref(null);
}

/** Base Component class.
 *	Provides `setState()` and `forceUpdate()`, which trigger rendering.
 *	@public
 *
 *	@example
 *	class MyFoo extends Component {
 *		render(props, state) {
 *			return <div />;
 *		}
 *	}
 */
function Component(props, context) {
	this._dirty = true;

	/** @public
  *	@type {object}
  */
	this.context = context;

	/** @public
  *	@type {object}
  */
	this.props = props;

	/** @public
  *	@type {object}
  */
	this.state = this.state || {};
}

extend(Component.prototype, {

	/** Returns a `boolean` indicating if the component should re-render when receiving the given `props` and `state`.
  *	@param {object} nextProps
  *	@param {object} nextState
  *	@param {object} nextContext
  *	@returns {Boolean} should the component re-render
  *	@name shouldComponentUpdate
  *	@function
  */

	/** Update component state by copying properties from `state` to `this.state`.
  *	@param {object} state		A hash of state properties to update with new values
  *	@param {function} callback	A function to be called once component state is updated
  */
	setState: function setState(state, callback) {
		var s = this.state;
		if (!this.prevState) this.prevState = extend({}, s);
		extend(s, typeof state === 'function' ? state(s, this.props) : state);
		if (callback) (this._renderCallbacks = this._renderCallbacks || []).push(callback);
		enqueueRender(this);
	},


	/** Immediately perform a synchronous re-render of the component.
  *	@param {function} callback		A function to be called after component is re-rendered.
  *	@private
  */
	forceUpdate: function forceUpdate(callback) {
		if (callback) (this._renderCallbacks = this._renderCallbacks || []).push(callback);
		renderComponent(this, 2);
	},


	/** Accepts `props` and `state`, and returns a new Virtual DOM tree to build.
  *	Virtual DOM is generally constructed via [JSX](http://jasonformat.com/wtf-is-jsx).
  *	@param {object} props		Props (eg: JSX attributes) received from parent element/component
  *	@param {object} state		The component's current state
  *	@param {object} context		Context object (if a parent component has provided context)
  *	@returns VNode
  */
	render: function render() {}
});

/** Render JSX into a `parent` Element.
 *	@param {VNode} vnode		A (JSX) VNode to render
 *	@param {Element} parent		DOM element to render into
 *	@param {Element} [merge]	Attempt to re-use an existing DOM tree rooted at `merge`
 *	@public
 *
 *	@example
 *	// render a div into <body>:
 *	render(<div id="hello">hello!</div>, document.body);
 *
 *	@example
 *	// render a "Thing" component into #foo:
 *	const Thing = ({ name }) => <span>{ name }</span>;
 *	render(<Thing name="one" />, document.querySelector('#foo'));
 */
function render(vnode, parent, merge) {
  return diff(merge, vnode, {}, false, parent, false);
}

var preact = {
	h: h,
	createElement: h,
	cloneElement: cloneElement,
	Component: Component,
	render: render,
	rerender: rerender,
	options: options
};

export { h, h as createElement, cloneElement, Component, render, rerender, options };
export default preact;
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