Move defaultProps into preact/compat (#4657)

* Move `defaultProps` into `preact/compat`

This will be handled in `options.vnode` for function/class components.
This hook gets called for every invocation of `jsx`/`createElement` and
`cloneElement`.

* Try it

* refactor: This is horrific but seems to work? (#4662)

---------

Co-authored-by: Ryan Christian <[email protected]>

Author: JoviDeCroock

compat/src/index.d.ts

@@ -1,10 +1,114 @@
 import * as _hooks from '../../hooks';
 // Intentionally not using a relative path to take advantage of
 // the TS version resolution mechanism
-import * as preact from 'preact';
+import * as preact1 from 'preact';
 import { JSXInternal } from '../../src/jsx';
 import * as _Suspense from './suspense';
 
+<<<<<<< HEAD
+=======
+interface SignalLike<T> {
+	value: T;
+	peek(): T;
+	subscribe(fn: (value: T) => void): () => void;
+}
+
+type Signalish<T> = T | SignalLike<T>;
+
+declare namespace preact {
+	export interface FunctionComponent<P = {}> {
+		(
+			props: preact1.RenderableProps<P>,
+			context?: any
+		): preact1.ComponentChildren;
+		displayName?: string;
+		defaultProps?: Partial<P> | undefined;
+	}
+
+	export interface ComponentClass<P = {}, S = {}> {
+		new (props: P, context?: any): preact1.Component<P, S>;
+		displayName?: string;
+		defaultProps?: Partial<P>;
+		contextType?: preact1.Context<any>;
+		getDerivedStateFromProps?(
+			props: Readonly<P>,
+			state: Readonly<S>
+		): Partial<S> | null;
+		getDerivedStateFromError?(error: any): Partial<S> | null;
+	}
+
+	export interface Component<P = {}, S = {}> {
+		componentWillMount?(): void;
+		componentDidMount?(): void;
+		componentWillUnmount?(): void;
+		getChildContext?(): object;
+		componentWillReceiveProps?(nextProps: Readonly<P>, nextContext: any): void;
+		shouldComponentUpdate?(
+			nextProps: Readonly<P>,
+			nextState: Readonly<S>,
+			nextContext: any
+		): boolean;
+		componentWillUpdate?(
+			nextProps: Readonly<P>,
+			nextState: Readonly<S>,
+			nextContext: any
+		): void;
+		getSnapshotBeforeUpdate?(oldProps: Readonly<P>, oldState: Readonly<S>): any;
+		componentDidUpdate?(
+			previousProps: Readonly<P>,
+			previousState: Readonly<S>,
+			snapshot: any
+		): void;
+		componentDidCatch?(error: any, errorInfo: preact1.ErrorInfo): void;
+	}
+
+	export abstract class Component<P, S> {
+		constructor(props?: P, context?: any);
+
+		static displayName?: string;
+		static defaultProps?: any;
+		static contextType?: preact1.Context<any>;
+
+		// Static members cannot reference class type parameters. This is not
+		// supported in TypeScript. Reusing the same type arguments from `Component`
+		// will lead to an impossible state where one cannot satisfy the type
+		// constraint under no circumstances, see #1356.In general type arguments
+		// seem to be a bit buggy and not supported well at the time of this
+		// writing with TS 3.3.3333.
+		static getDerivedStateFromProps?(
+			props: Readonly<object>,
+			state: Readonly<object>
+		): object | null;
+		static getDerivedStateFromError?(error: any): object | null;
+
+		state: Readonly<S>;
+		props: preact1.RenderableProps<P>;
+		context: any;
+
+		// From https://github.com/DefinitelyTyped/DefinitelyTyped/blob/e836acc75a78cf0655b5dfdbe81d69fdd4d8a252/types/react/index.d.ts#L402
+		// // We MUST keep setState() as a unified signature because it allows proper checking of the method return type.
+		// // See: https://github.com/DefinitelyTyped/DefinitelyTyped/issues/18365#issuecomment-351013257
+		setState<K extends keyof S>(
+			state:
+				| ((
+						prevState: Readonly<S>,
+						props: Readonly<P>
+				  ) => Pick<S, K> | Partial<S> | null)
+				| (Pick<S, K> | Partial<S> | null),
+			callback?: () => void
+		): void;
+
+		forceUpdate(callback?: () => void): void;
+
+		abstract render(
+			props?: preact1.RenderableProps<P>,
+			state?: Readonly<S>,
+			context?: any
+		): preact1.ComponentChildren;
+	}
+}
+
+>>>>>>> Move `defaultProps` into `preact/compat` (#4657)
 // export default React;
 export = React;
 export as namespace React;
@@ -41,32 +145,32 @@ declare namespace React {
 	): T;
 
 	// Preact Defaults
-	export import Context = preact.Context;
-	export import ContextType = preact.ContextType;
-	export import RefObject = preact.RefObject;
+	export import Context = preact1.Context;
+	export import ContextType = preact1.ContextType;
+	export import RefObject = preact1.RefObject;
 	export import Component = preact.Component;
 	export import FunctionComponent = preact.FunctionComponent;
-	export import ComponentType = preact.ComponentType;
+	export import ComponentType = preact1.ComponentType;
 	export import ComponentClass = preact.ComponentClass;
-	export import FC = preact.FunctionComponent;
-	export import createContext = preact.createContext;
-	export import Ref = preact.Ref;
-	export import createRef = preact.createRef;
-	export import Fragment = preact.Fragment;
-	export import createElement = preact.createElement;
-	export import cloneElement = preact.cloneElement;
-	export import ComponentProps = preact.ComponentProps;
-	export import ReactNode = preact.ComponentChild;
-	export import ReactElement = preact.VNode;
-	export import Consumer = preact.Consumer;
-	export import ErrorInfo = preact.ErrorInfo;
+	export import FC = preact1.FunctionComponent;
+	export import createContext = preact1.createContext;
+	export import Ref = preact1.Ref;
+	export import createRef = preact1.createRef;
+	export import Fragment = preact1.Fragment;
+	export import createElement = preact1.createElement;
+	export import cloneElement = preact1.cloneElement;
+	export import ComponentProps = preact1.ComponentProps;
+	export import ReactNode = preact1.ComponentChild;
+	export import ReactElement = preact1.VNode;
+	export import Consumer = preact1.Consumer;
+	export import ErrorInfo = preact1.ErrorInfo;
 
 	// Suspense
 	export import Suspense = _Suspense.Suspense;
 	export import lazy = _Suspense.lazy;
 
 	// Compat
-	export import StrictMode = preact.Fragment;
+	export import StrictMode = preact1.Fragment;
 	export const version: string;
 	export function startTransition(cb: () => void): void;
 
@@ -75,15 +179,15 @@ declare namespace React {
 		extends JSXInternal.HTMLAttributes<T> {}
 	export interface HTMLProps<T extends EventTarget>
 		extends JSXInternal.AllHTMLAttributes<T>,
-			preact.ClassAttributes<T> {}
+			preact1.ClassAttributes<T> {}
 	export interface AllHTMLAttributes<T extends EventTarget>
 		extends JSXInternal.AllHTMLAttributes<T> {}
 	export import DetailedHTMLProps = JSXInternal.DetailedHTMLProps;
 	export import CSSProperties = JSXInternal.CSSProperties;
 
 	export interface SVGProps<T extends EventTarget>
 		extends JSXInternal.SVGAttributes<T>,
-			preact.ClassAttributes<T> {}
+			preact1.ClassAttributes<T> {}
 
 	interface SVGAttributes extends JSXInternal.SVGAttributes {}
 
@@ -181,73 +285,73 @@ declare namespace React {
 	export import TransitionEventHandler = JSXInternal.TransitionEventHandler;
 
 	export function createPortal(
-		vnode: preact.ComponentChildren,
-		container: preact.ContainerNode
-	): preact.VNode<any>;
+		vnode: preact1.ComponentChildren,
+		container: preact1.ContainerNode
+	): preact1.VNode<any>;
 
 	export function render(
-		vnode: preact.ComponentChild,
-		parent: preact.ContainerNode,
+		vnode: preact1.ComponentChild,
+		parent: preact1.ContainerNode,
 		callback?: () => void
 	): Component | null;
 
 	export function hydrate(
-		vnode: preact.ComponentChild,
-		parent: preact.ContainerNode,
+		vnode: preact1.ComponentChild,
+		parent: preact1.ContainerNode,
 		callback?: () => void
 	): Component | null;
 
 	export function unmountComponentAtNode(
-		container: preact.ContainerNode
+		container: preact1.ContainerNode
 	): boolean;
 
 	export function createFactory(
-		type: preact.VNode<any>['type']
+		type: preact1.VNode<any>['type']
 	): (
 		props?: any,
-		...children: preact.ComponentChildren[]
-	) => preact.VNode<any>;
+		...children: preact1.ComponentChildren[]
+	) => preact1.VNode<any>;
 	export function isValidElement(element: any): boolean;
 	export function isFragment(element: any): boolean;
 	export function isMemo(element: any): boolean;
 	export function findDOMNode(
-		component: preact.Component | Element
+		component: preact1.Component | Element
 	): Element | null;
 
 	export abstract class PureComponent<
 		P = {},
 		S = {},
 		SS = any
-	> extends preact.Component<P, S> {
+	> extends preact1.Component<P, S> {
 		isPureReactComponent: boolean;
 	}
 
-	export type MemoExoticComponent<C extends preact.FunctionalComponent<any>> =
-		preact.FunctionComponent<ComponentProps<C>> & {
+	export type MemoExoticComponent<C extends preact1.FunctionalComponent<any>> =
+		preact1.FunctionComponent<ComponentProps<C>> & {
 			readonly type: C;
 		};
 
 	export function memo<P = {}>(
-		component: preact.FunctionalComponent<P>,
+		component: preact1.FunctionalComponent<P>,
 		comparer?: (prev: P, next: P) => boolean
-	): preact.FunctionComponent<P>;
-	export function memo<C extends preact.FunctionalComponent<any>>(
+	): preact1.FunctionComponent<P>;
+	export function memo<C extends preact1.FunctionalComponent<any>>(
 		component: C,
 		comparer?: (
-			prev: preact.ComponentProps<C>,
-			next: preact.ComponentProps<C>
+			prev: preact1.ComponentProps<C>,
+			next: preact1.ComponentProps<C>
 		) => boolean
 	): C;
 
-	export interface RefAttributes<R> extends preact.Attributes {
-		ref?: preact.Ref<R> | undefined;
+	export interface RefAttributes<R> extends preact1.Attributes {
+		ref?: preact1.Ref<R> | undefined;
 	}
 
 	/**
 	 * @deprecated Please use `ForwardRefRenderFunction` instead.
 	 */
 	export interface ForwardFn<P = {}, T = any> {
-		(props: P, ref: ForwardedRef<T>): preact.ComponentChild;
+		(props: P, ref: ForwardedRef<T>): preact1.ComponentChild;
 		displayName?: string;
 	}
 
@@ -257,13 +361,13 @@ declare namespace React {
 	}
 
 	export interface ForwardRefExoticComponent<P>
-		extends preact.FunctionComponent<P> {
+		extends preact1.FunctionComponent<P> {
 		defaultProps?: Partial<P> | undefined;
 	}
 
 	export function forwardRef<R, P = {}>(
-		fn: ForwardRefRenderFunction<R, P>
-	): preact.FunctionalComponent<PropsWithoutRef<P> & { ref?: preact.Ref<R> }>;
+		fn: ForwardFn<P, R>
+	): preact1.FunctionalComponent<PropsWithoutRef<P> & { ref?: preact1.Ref<R> }>;
 
 	export type PropsWithoutRef<P> = Omit<P, 'ref'>;
 
@@ -311,21 +415,21 @@ declare namespace React {
 	export function flushSync<A, R>(fn: (a: A) => R, a: A): R;
 
 	export type PropsWithChildren<P = unknown> = P & {
-		children?: preact.ComponentChildren | undefined;
+		children?: preact1.ComponentChildren | undefined;
 	};
 
 	export const Children: {
-		map<T extends preact.ComponentChild, R>(
+		map<T extends preact1.ComponentChild, R>(
 			children: T | T[],
 			fn: (child: T, i: number) => R
 		): R[];
-		forEach<T extends preact.ComponentChild>(
+		forEach<T extends preact1.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<{}>[];
+		count: (children: preact1.ComponentChildren) => number;
+		only: (children: preact1.ComponentChildren) => preact1.ComponentChild;
+		toArray: (children: preact1.ComponentChildren) => preact1.VNode<{}>[];
 	};
 
 	// scheduler

compat/src/render.js

@@ -24,6 +24,7 @@ import {
 	useSyncExternalStore,
 	useTransition
 } from './index';
+import { assign } from './util';
 
 export const REACT_ELEMENT_TYPE = Symbol.for('react.element');
 
@@ -237,8 +238,15 @@ options.vnode = vnode => {
 	// only normalize props on Element nodes
 	if (typeof vnode.type === 'string') {
 		handleDomVNode(vnode);
+	} else if (typeof vnode.type === 'function' && vnode.type.defaultProps) {
+		let normalizedProps = assign({}, vnode.props);
+		for (let i in vnode.type.defaultProps) {
+			if (normalizedProps[i] === undefined) {
+				normalizedProps[i] = vnode.type.defaultProps[i];
+			}
+		}
+		vnode.props = normalizedProps;
 	}
-
 	vnode.$$typeof = REACT_ELEMENT_TYPE;
 
 	if (oldVNodeHook) oldVNodeHook(vnode);