added web vendorsHEADmaster

14 files changed, 1247 insertions, 0 deletions

diff --git a/preact/compat/src/Children.js b/preact/compat/src/Children.js
new file mode 100644
index 0000000..0295d93
--- /dev/null
+++ b/preact/compat/src/Children.js
@@ -0,0 +1,21 @@
+import { toChildArray } from 'preact';
+
+const mapFn = (children, fn) => {
+	if (children == null) return null;
+	return toChildArray(toChildArray(children).map(fn));
+};
+
+// This API is completely unnecessary for Preact, so it's basically passthrough.
+export const Children = {
+	map: mapFn,
+	forEach: mapFn,
+	count(children) {
+		return children ? toChildArray(children).length : 0;
+	},
+	only(children) {
+		const normalized = toChildArray(children);
+		if (normalized.length !== 1) throw 'Children.only';
+		return normalized[0];
+	},
+	toArray: toChildArray
+};
diff --git a/preact/compat/src/PureComponent.js b/preact/compat/src/PureComponent.js
new file mode 100644
index 0000000..6396ce4
--- /dev/null
+++ b/preact/compat/src/PureComponent.js
@@ -0,0 +1,15 @@
+import { Component } from 'preact';
+import { shallowDiffers } from './util';
+
+/**
+ * Component class with a predefined `shouldComponentUpdate` implementation
+ */
+export function PureComponent(p) {
+	this.props = p;
+}
+PureComponent.prototype = new Component();
+// Some third-party libraries check if this property is present
+PureComponent.prototype.isPureReactComponent = true;
+PureComponent.prototype.shouldComponentUpdate = function(props, state) {
+	return shallowDiffers(this.props, props) || shallowDiffers(this.state, state);
+};
diff --git a/preact/compat/src/forwardRef.js b/preact/compat/src/forwardRef.js
new file mode 100644
index 0000000..39585cb
--- /dev/null
+++ b/preact/compat/src/forwardRef.js
@@ -0,0 +1,51 @@
+import { options } from 'preact';
+import { assign } from './util';
+
+let oldDiffHook = options._diff;
+options._diff = vnode => {
+	if (vnode.type && vnode.type._forwarded && vnode.ref) {
+		vnode.props.ref = vnode.ref;
+		vnode.ref = null;
+	}
+	if (oldDiffHook) oldDiffHook(vnode);
+};
+
+export const REACT_FORWARD_SYMBOL =
+	(typeof Symbol != 'undefined' &&
+		Symbol.for &&
+		Symbol.for('react.forward_ref')) ||
+	0xf47;
+
+/**
+ * Pass ref down to a child. This is mainly used in libraries with HOCs that
+ * wrap components. Using `forwardRef` there is an easy way to get a reference
+ * of the wrapped component instead of one of the wrapper itself.
+ * @param {import('./index').ForwardFn} fn
+ * @returns {import('./internal').FunctionComponent}
+ */
+export function forwardRef(fn) {
+	// We always have ref in props.ref, except for
+	// mobx-react. It will call this function directly
+	// and always pass ref as the second argument.
+	function Forwarded(props, ref) {
+		let clone = assign({}, props);
+		delete clone.ref;
+		ref = props.ref || ref;
+		return fn(
+			clone,
+			!ref || (typeof ref === 'object' && !('current' in ref)) ? null : ref
+		);
+	}
+
+	// mobx-react checks for this being present
+	Forwarded.$$typeof = REACT_FORWARD_SYMBOL;
+	// mobx-react heavily relies on implementation details.
+	// It expects an object here with a `render` property,
+	// and prototype.render will fail. Without this
+	// mobx-react throws.
+	Forwarded.render = Forwarded;
+
+	Forwarded.prototype.isReactComponent = Forwarded._forwarded = true;
+	Forwarded.displayName = 'ForwardRef(' + (fn.displayName || fn.name) + ')';
+	return Forwarded;
+}
diff --git a/preact/compat/src/index.d.ts b/preact/compat/src/index.d.ts
new file mode 100644
index 0000000..82c1a4f
--- /dev/null
+++ b/preact/compat/src/index.d.ts
@@ -0,0 +1,140 @@
+import * as _hooks from '../../hooks';
+import * as preact from '../../src';
+import { JSXInternal } from '../../src/jsx';
+import * as _Suspense from './suspense';
+import * as _SuspenseList from './suspense-list';
+
+// export default React;
+export = React;
+export as namespace React;
+declare namespace React {
+	// Export JSX
+	export import JSX = JSXInternal;
+
+	// Hooks
+	export import CreateHandle = _hooks.CreateHandle;
+	export import EffectCallback = _hooks.EffectCallback;
+	export import Inputs = _hooks.Inputs;
+	export import PropRef = _hooks.PropRef;
+	export import Reducer = _hooks.Reducer;
+	export import Ref = _hooks.Ref;
+	export import StateUpdater = _hooks.StateUpdater;
+	export import useCallback = _hooks.useCallback;
+	export import useContext = _hooks.useContext;
+	export import useDebugValue = _hooks.useDebugValue;
+	export import useEffect = _hooks.useEffect;
+	export import useImperativeHandle = _hooks.useImperativeHandle;
+	export import useLayoutEffect = _hooks.useLayoutEffect;
+	export import useMemo = _hooks.useMemo;
+	export import useReducer = _hooks.useReducer;
+	export import useRef = _hooks.useRef;
+	export import useState = _hooks.useState;
+
+	// Preact Defaults
+	export import Component = preact.Component;
+	export import FunctionComponent = preact.FunctionComponent;
+	export import FC = preact.FunctionComponent;
+	export import createContext = preact.createContext;
+	export import createRef = preact.createRef;
+	export import Fragment = preact.Fragment;
+	export import createElement = preact.createElement;
+	export import cloneElement = preact.cloneElement;
+
+	// Suspense
+	export import Suspense = _Suspense.Suspense;
+	export import lazy = _Suspense.lazy;
+	export import SuspenseList = _SuspenseList.SuspenseList;
+
+	// Compat
+	export import StrictMode = preact.Fragment;
+	export const version: string;
+
+	export function createPortal(
+		vnode: preact.VNode,
+		container: Element
+	): preact.VNode<any>;
+
+	export function render(
+		vnode: preact.VNode<any>,
+		parent: Element,
+		callback?: () => void
+	): Component | null;
+
+	export function hydrate(
+		vnode: preact.VNode<any>,
+		parent: Element,
+		callback?: () => void
+	): Component | null;
+
+	export function unmountComponentAtNode(
+		container: Element | Document | ShadowRoot | DocumentFragment
+	): boolean;
+
+	export function createFactory(
+		type: preact.VNode<any>['type']
+	): (
+		props?: any,
+		...children: preact.ComponentChildren[]
+	) => preact.VNode<any>;
+	export function isValidElement(element: any): boolean;
+	export function findDOMNode(component: preact.Component): Element | null;
+
+	export abstract class PureComponent<P = {}, S = {}> extends preact.Component<
+		P,
+		S
+	> {
+		isPureReactComponent: boolean;
+	}
+
+	export function memo<P = {}>(
+		component: preact.FunctionalComponent<P>,
+		comparer?: (prev: P, next: P) => boolean
+	): preact.FunctionComponent<P>;
+	export function memo<C extends preact.FunctionalComponent<any>>(
+		component: C,
+		comparer?: (
+			prev: preact.ComponentProps<C>,
+			next: preact.ComponentProps<C>
+		) => boolean
+	): C;
+
+	export interface ForwardFn<P = {}, T = any> {
+		(props: P, ref: Ref<T>): preact.ComponentChild;
+		displayName?: string;
+	}
+
+	export function forwardRef<R, P = {}>(
+		fn: ForwardFn<P, R>
+	): preact.FunctionalComponent<Omit<P, 'ref'> & { ref?: preact.RefObject<R> }>;
+
+	export function unstable_batchedUpdates(
+		callback: (arg?: any) => void,
+		arg?: any
+	): void;
+
+	export const Children: {
+		map<T extends preact.ComponentChild, R>(
+			children: T | T[],
+			fn: (child: T, i: number) => R
+		): R[];
+		forEach<T extends preact.ComponentChild>(
+			children: T | T[],
+			fn: (child: T, i: number) => void
+		): void;
+		count: (children: preact.ComponentChildren) => number;
+		only: (children: preact.ComponentChildren) => preact.ComponentChild;
+		toArray: (children: preact.ComponentChildren) => preact.VNode<{}>[];
+	};
+
+	// scheduler
+	export const unstable_ImmediatePriority: number;
+	export const unstable_UserBlockingPriority: number;
+	export const unstable_NormalPriority: number;
+	export const unstable_LowPriority: number;
+	export const unstable_IdlePriority: number;
+	export function unstable_runWithPriority(
+		priority: number,
+		callback: () => void
+	): void;
+	export const unstable_now: () => number;
+}
diff --git a/preact/compat/src/index.js b/preact/compat/src/index.js
new file mode 100644
index 0000000..c8f9a6c
--- /dev/null
+++ b/preact/compat/src/index.js
@@ -0,0 +1,187 @@
+import {
+	createElement,
+	render as preactRender,
+	cloneElement as preactCloneElement,
+	createRef,
+	Component,
+	createContext,
+	Fragment
+} from 'preact';
+import {
+	useState,
+	useReducer,
+	useEffect,
+	useLayoutEffect,
+	useRef,
+	useImperativeHandle,
+	useMemo,
+	useCallback,
+	useContext,
+	useDebugValue
+} from 'preact/hooks';
+import { PureComponent } from './PureComponent';
+import { memo } from './memo';
+import { forwardRef } from './forwardRef';
+import { Children } from './Children';
+import { Suspense, lazy } from './suspense';
+import { SuspenseList } from './suspense-list';
+import { createPortal } from './portals';
+import {
+	hydrate,
+	render,
+	REACT_ELEMENT_TYPE,
+	__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+} from './render';
+
+const version = '17.0.2'; // trick libraries to think we are react
+
+/**
+ * Legacy version of createElement.
+ * @param {import('./internal').VNode["type"]} type The node name or Component constructor
+ */
+function createFactory(type) {
+	return createElement.bind(null, type);
+}
+
+/**
+ * Check if the passed element is a valid (p)react node.
+ * @param {*} element The element to check
+ * @returns {boolean}
+ */
+function isValidElement(element) {
+	return !!element && element.$$typeof === REACT_ELEMENT_TYPE;
+}
+
+/**
+ * Wrap `cloneElement` to abort if the passed element is not a valid element and apply
+ * all vnode normalizations.
+ * @param {import('./internal').VNode} element The vnode to clone
+ * @param {object} props Props to add when cloning
+ * @param {Array<import('./internal').ComponentChildren>} rest Optional component children
+ */
+function cloneElement(element) {
+	if (!isValidElement(element)) return element;
+	return preactCloneElement.apply(null, arguments);
+}
+
+/**
+ * Remove a component tree from the DOM, including state and event handlers.
+ * @param {import('./internal').PreactElement} container
+ * @returns {boolean}
+ */
+function unmountComponentAtNode(container) {
+	if (container._children) {
+		preactRender(null, container);
+		return true;
+	}
+	return false;
+}
+
+/**
+ * Get the matching DOM node for a component
+ * @param {import('./internal').Component} component
+ * @returns {import('./internal').PreactElement | null}
+ */
+function findDOMNode(component) {
+	return (
+		(component &&
+			(component.base || (component.nodeType === 1 && component))) ||
+		null
+	);
+}
+
+/**
+ * Deprecated way to control batched rendering inside the reconciler, but we
+ * already schedule in batches inside our rendering code
+ * @template Arg
+ * @param {(arg: Arg) => void} callback function that triggers the updated
+ * @param {Arg} [arg] Optional argument that can be passed to the callback
+ */
+// eslint-disable-next-line camelcase
+const unstable_batchedUpdates = (callback, arg) => callback(arg);
+
+/**
+ * In React, `flushSync` flushes the entire tree and forces a rerender. It's
+ * implmented here as a no-op.
+ * @template Arg
+ * @template Result
+ * @param {(arg: Arg) => Result} callback function that runs before the flush
+ * @param {Arg} [arg] Optional arugment that can be passed to the callback
+ * @returns
+ */
+const flushSync = (callback, arg) => callback(arg);
+
+/**
+ * Strict Mode is not implemented in Preact, so we provide a stand-in for it
+ * that just renders its children without imposing any restrictions.
+ */
+const StrictMode = Fragment;
+
+export * from 'preact/hooks';
+export {
+	version,
+	Children,
+	render,
+	hydrate,
+	unmountComponentAtNode,
+	createPortal,
+	createElement,
+	createContext,
+	createFactory,
+	cloneElement,
+	createRef,
+	Fragment,
+	isValidElement,
+	findDOMNode,
+	Component,
+	PureComponent,
+	memo,
+	forwardRef,
+	flushSync,
+	// eslint-disable-next-line camelcase
+	unstable_batchedUpdates,
+	StrictMode,
+	Suspense,
+	SuspenseList,
+	lazy,
+	__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+};
+
+// React copies the named exports to the default one.
+export default {
+	useState,
+	useReducer,
+	useEffect,
+	useLayoutEffect,
+	useRef,
+	useImperativeHandle,
+	useMemo,
+	useCallback,
+	useContext,
+	useDebugValue,
+	version,
+	Children,
+	render,
+	hydrate,
+	unmountComponentAtNode,
+	createPortal,
+	createElement,
+	createContext,
+	createFactory,
+	cloneElement,
+	createRef,
+	Fragment,
+	isValidElement,
+	findDOMNode,
+	Component,
+	PureComponent,
+	memo,
+	forwardRef,
+	flushSync,
+	unstable_batchedUpdates,
+	StrictMode,
+	Suspense,
+	SuspenseList,
+	lazy,
+	__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
+};
diff --git a/preact/compat/src/internal.d.ts b/preact/compat/src/internal.d.ts
new file mode 100644
index 0000000..cb68ffa
--- /dev/null
+++ b/preact/compat/src/internal.d.ts
@@ -0,0 +1,47 @@
+import {
+	Component as PreactComponent,
+	VNode as PreactVNode,
+	FunctionComponent as PreactFunctionComponent
+} from '../../src/internal';
+import { SuspenseProps } from './suspense';
+
+export { ComponentChildren } from '../..';
+
+export { PreactElement } from '../../src/internal';
+
+export interface Component<P = {}, S = {}> extends PreactComponent<P, S> {
+	isReactComponent?: object;
+	isPureReactComponent?: true;
+	_patchedLifecycles?: true;
+
+	// Suspense internal properties
+	_childDidSuspend?(error: Promise<void>, suspendingVNode: VNode): void;
+	_suspended: (vnode: VNode) => (unsuspend: () => void) => void;
+	_onResolve?(): void;
+
+	// Portal internal properties
+	_temp: any;
+	_container: PreactElement;
+}
+
+export interface FunctionComponent<P = {}> extends PreactFunctionComponent<P> {
+	shouldComponentUpdate?(nextProps: Readonly<P>): boolean;
+	_forwarded?: boolean;
+	_patchedLifecycles?: true;
+}
+
+export interface VNode<T = any> extends PreactVNode<T> {
+	$$typeof?: symbol | string;
+	preactCompatNormalized?: boolean;
+}
+
+export interface SuspenseState {
+	_suspended?: null | VNode<any>;
+}
+
+export interface SuspenseComponent
+	extends PreactComponent<SuspenseProps, SuspenseState> {
+	_pendingSuspensionCount: number;
+	_suspenders: Component[];
+	_detachOnNextRender: null | VNode<any>;
+}
diff --git a/preact/compat/src/memo.js b/preact/compat/src/memo.js
new file mode 100644
index 0000000..e743199
--- /dev/null
+++ b/preact/compat/src/memo.js
@@ -0,0 +1,34 @@
+import { createElement } from 'preact';
+import { shallowDiffers } from './util';
+
+/**
+ * Memoize a component, so that it only updates when the props actually have
+ * changed. This was previously known as `React.pure`.
+ * @param {import('./internal').FunctionComponent} c functional component
+ * @param {(prev: object, next: object) => boolean} [comparer] Custom equality function
+ * @returns {import('./internal').FunctionComponent}
+ */
+export function memo(c, comparer) {
+	function shouldUpdate(nextProps) {
+		let ref = this.props.ref;
+		let updateRef = ref == nextProps.ref;
+		if (!updateRef && ref) {
+			ref.call ? ref(null) : (ref.current = null);
+		}
+
+		if (!comparer) {
+			return shallowDiffers(this.props, nextProps);
+		}
+
+		return !comparer(this.props, nextProps) || !updateRef;
+	}
+
+	function Memoed(props) {
+		this.shouldComponentUpdate = shouldUpdate;
+		return createElement(c, props);
+	}
+	Memoed.displayName = 'Memo(' + (c.displayName || c.name) + ')';
+	Memoed.prototype.isReactComponent = true;
+	Memoed._forwarded = true;
+	return Memoed;
+}
diff --git a/preact/compat/src/portals.js b/preact/compat/src/portals.js
new file mode 100644
index 0000000..cf9f8f7
--- /dev/null
+++ b/preact/compat/src/portals.js
@@ -0,0 +1,80 @@
+import { createElement, render } from 'preact';
+
+/**
+ * @param {import('../../src/index').RenderableProps<{ context: any }>} props
+ */
+function ContextProvider(props) {
+	this.getChildContext = () => props.context;
+	return props.children;
+}
+
+/**
+ * Portal component
+ * @this {import('./internal').Component}
+ * @param {object | null | undefined} props
+ *
+ * TODO: use createRoot() instead of fake root
+ */
+function Portal(props) {
+	const _this = this;
+	let container = props._container;
+
+	_this.componentWillUnmount = function() {
+		render(null, _this._temp);
+		_this._temp = null;
+		_this._container = null;
+	};
+
+	// When we change container we should clear our old container and
+	// indicate a new mount.
+	if (_this._container && _this._container !== container) {
+		_this.componentWillUnmount();
+	}
+
+	// When props.vnode is undefined/false/null we are dealing with some kind of
+	// conditional vnode. This should not trigger a render.
+	if (props._vnode) {
+		if (!_this._temp) {
+			_this._container = container;
+
+			// Create a fake DOM parent node that manages a subset of `container`'s children:
+			_this._temp = {
+				nodeType: 1,
+				parentNode: container,
+				childNodes: [],
+				appendChild(child) {
+					this.childNodes.push(child);
+					_this._container.appendChild(child);
+				},
+				insertBefore(child, before) {
+					this.childNodes.push(child);
+					_this._container.appendChild(child);
+				},
+				removeChild(child) {
+					this.childNodes.splice(this.childNodes.indexOf(child) >>> 1, 1);
+					_this._container.removeChild(child);
+				}
+			};
+		}
+
+		// Render our wrapping element into temp.
+		render(
+			createElement(ContextProvider, { context: _this.context }, props._vnode),
+			_this._temp
+		);
+	}
+	// When we come from a conditional render, on a mounted
+	// portal we should clear the DOM.
+	else if (_this._temp) {
+		_this.componentWillUnmount();
+	}
+}
+
+/**
+ * Create a `Portal` to continue rendering the vnode tree at a different DOM node
+ * @param {import('./internal').VNode} vnode The vnode to render
+ * @param {import('./internal').PreactElement} container The DOM node to continue rendering in to.
+ */
+export function createPortal(vnode, container) {
+	return createElement(Portal, { _vnode: vnode, _container: container });
+}
diff --git a/preact/compat/src/render.js b/preact/compat/src/render.js
new file mode 100644
index 0000000..2448d2d
--- /dev/null
+++ b/preact/compat/src/render.js
@@ -0,0 +1,219 @@
+import {
+	render as preactRender,
+	hydrate as preactHydrate,
+	options,
+	toChildArray,
+	Component
+} from 'preact';
+
+export const REACT_ELEMENT_TYPE =
+	(typeof Symbol != 'undefined' && Symbol.for && Symbol.for('react.element')) ||
+	0xeac7;
+
+const CAMEL_PROPS = /^(?:accent|alignment|arabic|baseline|cap|clip(?!PathU)|color|fill|flood|font|glyph(?!R)|horiz|marker(?!H|W|U)|overline|paint|stop|strikethrough|stroke|text(?!L)|underline|unicode|units|v|vector|vert|word|writing|x(?!C))[A-Z]/;
+
+// Input types for which onchange should not be converted to oninput.
+// type="file|checkbox|radio", plus "range" in IE11.
+// (IE11 doesn't support Symbol, which we use here to turn `rad` into `ra` which matches "range")
+const onChangeInputType = type =>
+	(typeof Symbol != 'undefined' && typeof Symbol() == 'symbol'
+		? /fil|che|rad/i
+		: /fil|che|ra/i
+	).test(type);
+
+// Some libraries like `react-virtualized` explicitly check for this.
+Component.prototype.isReactComponent = {};
+
+// `UNSAFE_*` lifecycle hooks
+// Preact only ever invokes the unprefixed methods.
+// Here we provide a base "fallback" implementation that calls any defined UNSAFE_ prefixed method.
+// - If a component defines its own `componentDidMount()` (including via defineProperty), use that.
+// - If a component defines `UNSAFE_componentDidMount()`, `componentDidMount` is the alias getter/setter.
+// - If anything assigns to an `UNSAFE_*` property, the assignment is forwarded to the unprefixed property.
+// See https://github.com/preactjs/preact/issues/1941
+[
+	'componentWillMount',
+	'componentWillReceiveProps',
+	'componentWillUpdate'
+].forEach(key => {
+	Object.defineProperty(Component.prototype, key, {
+		configurable: true,
+		get() {
+			return this['UNSAFE_' + key];
+		},
+		set(v) {
+			Object.defineProperty(this, key, {
+				configurable: true,
+				writable: true,
+				value: v
+			});
+		}
+	});
+});
+
+/**
+ * Proxy render() since React returns a Component reference.
+ * @param {import('./internal').VNode} vnode VNode tree to render
+ * @param {import('./internal').PreactElement} parent DOM node to render vnode tree into
+ * @param {() => void} [callback] Optional callback that will be called after rendering
+ * @returns {import('./internal').Component | null} The root component reference or null
+ */
+export function render(vnode, parent, callback) {
+	// React destroys any existing DOM nodes, see #1727
+	// ...but only on the first render, see #1828
+	if (parent._children == null) {
+		parent.textContent = '';
+	}
+
+	preactRender(vnode, parent);
+	if (typeof callback == 'function') callback();
+
+	return vnode ? vnode._component : null;
+}
+
+export function hydrate(vnode, parent, callback) {
+	preactHydrate(vnode, parent);
+	if (typeof callback == 'function') callback();
+
+	return vnode ? vnode._component : null;
+}
+
+let oldEventHook = options.event;
+options.event = e => {
+	if (oldEventHook) e = oldEventHook(e);
+	e.persist = empty;
+	e.isPropagationStopped = isPropagationStopped;
+	e.isDefaultPrevented = isDefaultPrevented;
+	return (e.nativeEvent = e);
+};
+
+function empty() {}
+
+function isPropagationStopped() {
+	return this.cancelBubble;
+}
+
+function isDefaultPrevented() {
+	return this.defaultPrevented;
+}
+
+let classNameDescriptor = {
+	configurable: true,
+	get() {
+		return this.class;
+	}
+};
+
+let oldVNodeHook = options.vnode;
+options.vnode = vnode => {
+	let type = vnode.type;
+	let props = vnode.props;
+	let normalizedProps = props;
+
+	// only normalize props on Element nodes
+	if (typeof type === 'string') {
+		normalizedProps = {};
+
+		for (let i in props) {
+			let value = props[i];
+
+			if (i === 'value' && 'defaultValue' in props && value == null) {
+				// Skip applying value if it is null/undefined and we already set
+				// a default value
+				continue;
+			} else if (
+				i === 'defaultValue' &&
+				'value' in props &&
+				props.value == null
+			) {
+				// `defaultValue` is treated as a fallback `value` when a value prop is present but null/undefined.
+				// `defaultValue` for Elements with no value prop is the same as the DOM defaultValue property.
+				i = 'value';
+			} else if (i === 'download' && value === true) {
+				// Calling `setAttribute` with a truthy value will lead to it being
+				// passed as a stringified value, e.g. `download="true"`. React
+				// converts it to an empty string instead, otherwise the attribute
+				// value will be used as the file name and the file will be called
+				// "true" upon downloading it.
+				value = '';
+			} else if (/ondoubleclick/i.test(i)) {
+				i = 'ondblclick';
+			} else if (
+				/^onchange(textarea|input)/i.test(i + type) &&
+				!onChangeInputType(props.type)
+			) {
+				i = 'oninput';
+			} else if (/^on(Ani|Tra|Tou|BeforeInp)/.test(i)) {
+				i = i.toLowerCase();
+			} else if (CAMEL_PROPS.test(i)) {
+				i = i.replace(/[A-Z0-9]/, '-$&').toLowerCase();
+			} else if (value === null) {
+				value = undefined;
+			}
+
+			normalizedProps[i] = value;
+		}
+
+		// Add support for array select values: <select multiple value={[]} />
+		if (
+			type == 'select' &&
+			normalizedProps.multiple &&
+			Array.isArray(normalizedProps.value)
+		) {
+			// forEach() always returns undefined, which we abuse here to unset the value prop.
+			normalizedProps.value = toChildArray(props.children).forEach(child => {
+				child.props.selected =
+					normalizedProps.value.indexOf(child.props.value) != -1;
+			});
+		}
+
+		// Adding support for defaultValue in select tag
+		if (type == 'select' && normalizedProps.defaultValue != null) {
+			normalizedProps.value = toChildArray(props.children).forEach(child => {
+				if (normalizedProps.multiple) {
+					child.props.selected =
+						normalizedProps.defaultValue.indexOf(child.props.value) != -1;
+				} else {
+					child.props.selected =
+						normalizedProps.defaultValue == child.props.value;
+				}
+			});
+		}
+
+		vnode.props = normalizedProps;
+	}
+
+	if (type && props.class != props.className) {
+		classNameDescriptor.enumerable = 'className' in props;
+		if (props.className != null) normalizedProps.class = props.className;
+		Object.defineProperty(normalizedProps, 'className', classNameDescriptor);
+	}
+
+	vnode.$$typeof = REACT_ELEMENT_TYPE;
+
+	if (oldVNodeHook) oldVNodeHook(vnode);
+};
+
+// Only needed for react-relay
+let currentComponent;
+const oldBeforeRender = options._render;
+options._render = function(vnode) {
+	if (oldBeforeRender) {
+		oldBeforeRender(vnode);
+	}
+	currentComponent = vnode._component;
+};
+
+// This is a very very private internal function for React it
+// is used to sort-of do runtime dependency injection. So far
+// only `react-relay` makes use of it. It uses it to read the
+// context value.
+export const __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED = {
+	ReactCurrentDispatcher: {
+		current: {
+			readContext(context) {
+				return currentComponent._globalContext[context._id].props.value;
+			}
+		}
+	}
+};
diff --git a/preact/compat/src/suspense-list.d.ts b/preact/compat/src/suspense-list.d.ts
new file mode 100644
index 0000000..caa1eb6
--- /dev/null
+++ b/preact/compat/src/suspense-list.d.ts
@@ -0,0 +1,14 @@
+import { Component, ComponentChild, ComponentChildren } from '../../src';
+
+//
+// SuspenseList
+// -----------------------------------
+
+export interface SuspenseListProps {
+	children?: ComponentChildren;
+	revealOrder?: 'forwards' | 'backwards' | 'together';
+}
+
+export class SuspenseList extends Component<SuspenseListProps> {
+	render(): ComponentChild;
+}
diff --git a/preact/compat/src/suspense-list.js b/preact/compat/src/suspense-list.js
new file mode 100644
index 0000000..cf162cb
--- /dev/null
+++ b/preact/compat/src/suspense-list.js
@@ -0,0 +1,126 @@
+import { Component, toChildArray } from 'preact';
+import { suspended } from './suspense.js';
+
+// Indexes to linked list nodes (nodes are stored as arrays to save bytes).
+const SUSPENDED_COUNT = 0;
+const RESOLVED_COUNT = 1;
+const NEXT_NODE = 2;
+
+// Having custom inheritance instead of a class here saves a lot of bytes.
+export function SuspenseList() {
+	this._next = null;
+	this._map = null;
+}
+
+// Mark one of child's earlier suspensions as resolved.
+// Some pending callbacks may become callable due to this
+// (e.g. the last suspended descendant gets resolved when
+// revealOrder === 'together'). Process those callbacks as well.
+const resolve = (list, child, node) => {
+	if (++node[RESOLVED_COUNT] === node[SUSPENDED_COUNT]) {
+		// The number a child (or any of its descendants) has been suspended
+		// matches the number of times it's been resolved. Therefore we
+		// mark the child as completely resolved by deleting it from ._map.
+		// This is used to figure out when *all* children have been completely
+		// resolved when revealOrder is 'together'.
+		list._map.delete(child);
+	}
+
+	// If revealOrder is falsy then we can do an early exit, as the
+	// callbacks won't get queued in the node anyway.
+	// If revealOrder is 'together' then also do an early exit
+	// if all suspended descendants have not yet been resolved.
+	if (
+		!list.props.revealOrder ||
+		(list.props.revealOrder[0] === 't' && list._map.size)
+	) {
+		return;
+	}
+
+	// Walk the currently suspended children in order, calling their
+	// stored callbacks on the way. Stop if we encounter a child that
+	// has not been completely resolved yet.
+	node = list._next;
+	while (node) {
+		while (node.length > 3) {
+			node.pop()();
+		}
+		if (node[RESOLVED_COUNT] < node[SUSPENDED_COUNT]) {
+			break;
+		}
+		list._next = node = node[NEXT_NODE];
+	}
+};
+
+// Things we do here to save some bytes but are not proper JS inheritance:
+// - call `new Component()` as the prototype
+// - do not set `Suspense.prototype.constructor` to `Suspense`
+SuspenseList.prototype = new Component();
+
+SuspenseList.prototype._suspended = function(child) {
+	const list = this;
+	const delegated = suspended(list._vnode);
+
+	let node = list._map.get(child);
+	node[SUSPENDED_COUNT]++;
+
+	return unsuspend => {
+		const wrappedUnsuspend = () => {
+			if (!list.props.revealOrder) {
+				// Special case the undefined (falsy) revealOrder, as there
+				// is no need to coordinate a specific order or unsuspends.
+				unsuspend();
+			} else {
+				node.push(unsuspend);
+				resolve(list, child, node);
+			}
+		};
+		if (delegated) {
+			delegated(wrappedUnsuspend);
+		} else {
+			wrappedUnsuspend();
+		}
+	};
+};
+
+SuspenseList.prototype.render = function(props) {
+	this._next = null;
+	this._map = new Map();
+
+	const children = toChildArray(props.children);
+	if (props.revealOrder && props.revealOrder[0] === 'b') {
+		// If order === 'backwards' (or, well, anything starting with a 'b')
+		// then flip the child list around so that the last child will be
+		// the first in the linked list.
+		children.reverse();
+	}
+	// Build the linked list. Iterate through the children in reverse order
+	// so that `_next` points to the first linked list node to be resolved.
+	for (let i = children.length; i--; ) {
+		// Create a new linked list node as an array of form:
+		// 	[suspended_count, resolved_count, next_node]
+		// where suspended_count and resolved_count are numeric counters for
+		// keeping track how many times a node has been suspended and resolved.
+		//
+		// Note that suspended_count starts from 1 instead of 0, so we can block
+		// processing callbacks until componentDidMount has been called. In a sense
+		// node is suspended at least until componentDidMount gets called!
+		//
+		// Pending callbacks are added to the end of the node:
+		// 	[suspended_count, resolved_count, next_node, callback_0, callback_1, ...]
+		this._map.set(children[i], (this._next = [1, 0, this._next]));
+	}
+	return props.children;
+};
+
+SuspenseList.prototype.componentDidUpdate = SuspenseList.prototype.componentDidMount = function() {
+	// Iterate through all children after mounting for two reasons:
+	// 1. As each node[SUSPENDED_COUNT] starts from 1, this iteration increases
+	//    each node[RELEASED_COUNT] by 1, therefore balancing the counters.
+	//    The nodes can now be completely consumed from the linked list.
+	// 2. Handle nodes that might have gotten resolved between render and
+	//    componentDidMount.
+	this._map.forEach((node, child) => {
+		resolve(this, child, node);
+	});
+};
diff --git a/preact/compat/src/suspense.d.ts b/preact/compat/src/suspense.d.ts
new file mode 100644
index 0000000..9bd0e74
--- /dev/null
+++ b/preact/compat/src/suspense.d.ts
@@ -0,0 +1,15 @@
+import { Component, ComponentChild, ComponentChildren } from '../../src';
+
+//
+// Suspense/lazy
+// -----------------------------------
+export function lazy<T>(loader: () => Promise<{ default: T } | T>): T;
+
+export interface SuspenseProps {
+	children?: ComponentChildren;
+	fallback: ComponentChildren;
+}
+
+export class Suspense extends Component<SuspenseProps> {
+	render(): ComponentChild;
+}
diff --git a/preact/compat/src/suspense.js b/preact/compat/src/suspense.js
new file mode 100644
index 0000000..6244eaf
--- /dev/null
+++ b/preact/compat/src/suspense.js
@@ -0,0 +1,270 @@
+import { Component, createElement, options, Fragment } from 'preact';
+import { assign } from './util';
+
+const oldCatchError = options._catchError;
+options._catchError = function(error, newVNode, oldVNode) {
+	if (error.then) {
+		/** @type {import('./internal').Component} */
+		let component;
+		let vnode = newVNode;
+
+		for (; (vnode = vnode._parent); ) {
+			if ((component = vnode._component) && component._childDidSuspend) {
+				if (newVNode._dom == null) {
+					newVNode._dom = oldVNode._dom;
+					newVNode._children = oldVNode._children;
+				}
+				// Don't call oldCatchError if we found a Suspense
+				return component._childDidSuspend(error, newVNode);
+			}
+		}
+	}
+	oldCatchError(error, newVNode, oldVNode);
+};
+
+const oldUnmount = options.unmount;
+options.unmount = function(vnode) {
+	/** @type {import('./internal').Component} */
+	const component = vnode._component;
+	if (component && component._onResolve) {
+		component._onResolve();
+	}
+
+	// if the component is still hydrating
+	// most likely it is because the component is suspended
+	// we set the vnode.type as `null` so that it is not a typeof function
+	// so the unmount will remove the vnode._dom
+	if (component && vnode._hydrating === true) {
+		vnode.type = null;
+	}
+
+	if (oldUnmount) oldUnmount(vnode);
+};
+
+function detachedClone(vnode, detachedParent, parentDom) {
+	if (vnode) {
+		if (vnode._component && vnode._component.__hooks) {
+			vnode._component.__hooks._list.forEach(effect => {
+				if (typeof effect._cleanup == 'function') effect._cleanup();
+			});
+
+			vnode._component.__hooks = null;
+		}
+
+		vnode = assign({}, vnode);
+		if (vnode._component != null) {
+			if (vnode._component._parentDom === parentDom) {
+				vnode._component._parentDom = detachedParent;
+			}
+			vnode._component = null;
+		}
+
+		vnode._children =
+			vnode._children &&
+			vnode._children.map(child =>
+				detachedClone(child, detachedParent, parentDom)
+			);
+	}
+
+	return vnode;
+}
+
+function removeOriginal(vnode, detachedParent, originalParent) {
+	if (vnode) {
+		vnode._original = null;
+		vnode._children =
+			vnode._children &&
+			vnode._children.map(child =>
+				removeOriginal(child, detachedParent, originalParent)
+			);
+
+		if (vnode._component) {
+			if (vnode._component._parentDom === detachedParent) {
+				if (vnode._dom) {
+					originalParent.insertBefore(vnode._dom, vnode._nextDom);
+				}
+				vnode._component._force = true;
+				vnode._component._parentDom = originalParent;
+			}
+		}
+	}
+
+	return vnode;
+}
+
+// having custom inheritance instead of a class here saves a lot of bytes
+export function Suspense() {
+	// we do not call super here to golf some bytes...
+	this._pendingSuspensionCount = 0;
+	this._suspenders = null;
+	this._detachOnNextRender = null;
+}
+
+// Things we do here to save some bytes but are not proper JS inheritance:
+// - call `new Component()` as the prototype
+// - do not set `Suspense.prototype.constructor` to `Suspense`
+Suspense.prototype = new Component();
+
+/**
+ * @this {import('./internal').SuspenseComponent}
+ * @param {Promise} promise The thrown promise
+ * @param {import('./internal').VNode<any, any>} suspendingVNode The suspending component
+ */
+Suspense.prototype._childDidSuspend = function(promise, suspendingVNode) {
+	const suspendingComponent = suspendingVNode._component;
+
+	/** @type {import('./internal').SuspenseComponent} */
+	const c = this;
+
+	if (c._suspenders == null) {
+		c._suspenders = [];
+	}
+	c._suspenders.push(suspendingComponent);
+
+	const resolve = suspended(c._vnode);
+
+	let resolved = false;
+	const onResolved = () => {
+		if (resolved) return;
+
+		resolved = true;
+		suspendingComponent._onResolve = null;
+
+		if (resolve) {
+			resolve(onSuspensionComplete);
+		} else {
+			onSuspensionComplete();
+		}
+	};
+
+	suspendingComponent._onResolve = onResolved;
+
+	const onSuspensionComplete = () => {
+		if (!--c._pendingSuspensionCount) {
+			// If the suspension was during hydration we don't need to restore the
+			// suspended children into the _children array
+			if (c.state._suspended) {
+				const suspendedVNode = c.state._suspended;
+				c._vnode._children[0] = removeOriginal(
+					suspendedVNode,
+					suspendedVNode._component._parentDom,
+					suspendedVNode._component._originalParentDom
+				);
+			}
+
+			c.setState({ _suspended: (c._detachOnNextRender = null) });
+
+			let suspended;
+			while ((suspended = c._suspenders.pop())) {
+				suspended.forceUpdate();
+			}
+		}
+	};
+
+	/**
+	 * We do not set `suspended: true` during hydration because we want the actual markup
+	 * to remain on screen and hydrate it when the suspense actually gets resolved.
+	 * While in non-hydration cases the usual fallback -> component flow would occour.
+	 */
+	const wasHydrating = suspendingVNode._hydrating === true;
+	if (!c._pendingSuspensionCount++ && !wasHydrating) {
+		c.setState({ _suspended: (c._detachOnNextRender = c._vnode._children[0]) });
+	}
+	promise.then(onResolved, onResolved);
+};
+
+Suspense.prototype.componentWillUnmount = function() {
+	this._suspenders = [];
+};
+
+/**
+ * @this {import('./internal').SuspenseComponent}
+ * @param {import('./internal').SuspenseComponent["props"]} props
+ * @param {import('./internal').SuspenseState} state
+ */
+Suspense.prototype.render = function(props, state) {
+	if (this._detachOnNextRender) {
+		// When the Suspense's _vnode was created by a call to createVNode
+		// (i.e. due to a setState further up in the tree)
+		// it's _children prop is null, in this case we "forget" about the parked vnodes to detach
+		if (this._vnode._children) {
+			const detachedParent = document.createElement('div');
+			const detachedComponent = this._vnode._children[0]._component;
+			this._vnode._children[0] = detachedClone(
+				this._detachOnNextRender,
+				detachedParent,
+				(detachedComponent._originalParentDom = detachedComponent._parentDom)
+			);
+		}
+
+		this._detachOnNextRender = null;
+	}
+
+	// Wrap fallback tree in a VNode that prevents itself from being marked as aborting mid-hydration:
+	/** @type {import('./internal').VNode} */
+	const fallback =
+		state._suspended && createElement(Fragment, null, props.fallback);
+	if (fallback) fallback._hydrating = null;
+
+	return [
+		createElement(Fragment, null, state._suspended ? null : props.children),
+		fallback
+	];
+};
+
+/**
+ * Checks and calls the parent component's _suspended method, passing in the
+ * suspended vnode. This is a way for a parent (e.g. SuspenseList) to get notified
+ * that one of its children/descendants suspended.
+ *
+ * The parent MAY return a callback. The callback will get called when the
+ * suspension resolves, notifying the parent of the fact.
+ * Moreover, the callback gets function `unsuspend` as a parameter. The resolved
+ * child descendant will not actually get unsuspended until `unsuspend` gets called.
+ * This is a way for the parent to delay unsuspending.
+ *
+ * If the parent does not return a callback then the resolved vnode
+ * gets unsuspended immediately when it resolves.
+ *
+ * @param {import('./internal').VNode} vnode
+ * @returns {((unsuspend: () => void) => void)?}
+ */
+export function suspended(vnode) {
+	/** @type {import('./internal').Component} */
+	let component = vnode._parent._component;
+	return component && component._suspended && component._suspended(vnode);
+}
+
+export function lazy(loader) {
+	let prom;
+	let component;
+	let error;
+
+	function Lazy(props) {
+		if (!prom) {
+			prom = loader();
+			prom.then(
+				exports => {
+					component = exports.default || exports;
+				},
+				e => {
+					error = e;
+				}
+			);
+		}
+
+		if (error) {
+			throw error;
+		}
+
+		if (!component) {
+			throw prom;
+		}
+
+		return createElement(component, props);
+	}
+
+	Lazy.displayName = 'Lazy';
+	Lazy._forwarded = true;
+	return Lazy;
+}
diff --git a/preact/compat/src/util.js b/preact/compat/src/util.js
new file mode 100644
index 0000000..fa12b09
--- /dev/null
+++ b/preact/compat/src/util.js
@@ -0,0 +1,28 @@
+/**
+ * Assign properties from `props` to `obj`
+ * @template O, P The obj and props types
+ * @param {O} obj The object to copy properties to
+ * @param {P} props The object to copy properties from
+ * @returns {O & P}
+ */
+export function assign(obj, props) {
+	for (let i in props) obj[i] = props[i];
+	return /** @type {O & P} */ (obj);
+}
+
+/**
+ * Check if two objects have a different shape
+ * @param {object} a
+ * @param {object} b
+ * @returns {boolean}
+ */
+export function shallowDiffers(a, b) {
+	for (let i in a) if (i !== '__source' && !(i in b)) return true;
+	for (let i in b) if (i !== '__source' && a[i] !== b[i]) return true;
+	return false;
+}
+
+export function removeNode(node) {
+	let parentNode = node.parentNode;
+	if (parentNode) parentNode.removeChild(node);
+}