1 files changed, 146 insertions, 0 deletions
diff --git a/preact/src/internal.d.ts b/preact/src/internal.d.ts
new file mode 100644
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--- /dev/null
+++ b/preact/src/internal.d.ts
@@ -0,0 +1,146 @@
+import * as preact from './index';
+
+export enum HookType {
+	useState = 1,
+	useReducer = 2,
+	useEffect = 3,
+	useLayoutEffect = 4,
+	useRef = 5,
+	useImperativeHandle = 6,
+	useMemo = 7,
+	useCallback = 8,
+	useContext = 9,
+	useErrorBoundary = 10,
+	// Not a real hook, but the devtools treat is as such
+	useDebugvalue = 11
+}
+
+export interface DevSource {
+	fileName: string;
+	lineNumber: number;
+}
+
+export interface Options extends preact.Options {
+	/** Attach a hook that is invoked before render, mainly to check the arguments. */
+	_root?(
+		vnode: ComponentChild,
+		parent: Element | Document | ShadowRoot | DocumentFragment
+	): void;
+	/** Attach a hook that is invoked before a vnode is diffed. */
+	_diff?(vnode: VNode): void;
+	/** Attach a hook that is invoked after a tree was mounted or was updated. */
+	_commit?(vnode: VNode, commitQueue: Component[]): void;
+	/** Attach a hook that is invoked before a vnode has rendered. */
+	_render?(vnode: VNode): void;
+	/** Attach a hook that is invoked before a hook's state is queried. */
+	_hook?(component: Component, index: number, type: HookType): void;
+	/** Bypass effect execution. Currenty only used in devtools for hooks inspection */
+	_skipEffects?: boolean;
+	/** Attach a hook that is invoked after an error is caught in a component but before calling lifecycle hooks */
+	_catchError(error: any, vnode: VNode, oldVNode?: VNode | undefined): void;
+}
+
+export type ComponentChild =
+	| VNode<any>
+	| string
+	| number
+	| boolean
+	| null
+	| undefined;
+export type ComponentChildren = ComponentChild[] | ComponentChild;
+
+export interface FunctionComponent<P = {}> extends preact.FunctionComponent<P> {
+	// Internally, createContext uses `contextType` on a Function component to
+	// implement the Consumer component
+	contextType?: PreactContext;
+
+	// Internally, createContext stores a ref to the context object on the Provider
+	// Function component to help devtools
+	_contextRef?: PreactContext;
+
+	// Define these properties as undefined on FunctionComponent to get rid of
+	// some errors in `diff()`
+	getDerivedStateFromProps?: undefined;
+	getDerivedStateFromError?: undefined;
+}
+
+export interface ComponentClass<P = {}> extends preact.ComponentClass<P> {
+	_contextRef?: any;
+
+	// Override public contextType with internal PreactContext type
+	contextType?: PreactContext;
+}
+
+// Redefine ComponentType using our new internal FunctionComponent interface above
+export type ComponentType<P = {}> = ComponentClass<P> | FunctionComponent<P>;
+
+export interface PreactElement extends HTMLElement {
+	_children?: VNode<any> | null;
+	/** Event listeners to support event delegation */
+	_listeners?: Record<string, (e: Event) => void>;
+
+	// Preact uses this attribute to detect SVG nodes
+	ownerSVGElement?: SVGElement | null;
+
+	// style: HTMLElement["style"]; // From HTMLElement
+
+	data?: string | number; // From Text node
+}
+
+// We use the `current` property to differentiate between the two kinds of Refs so
+// internally we'll define `current` on both to make TypeScript happy
+type RefObject<T> = { current: T | null };
+type RefCallback<T> = { (instance: T | null): void; current: undefined };
+type Ref<T> = RefObject<T> | RefCallback<T>;
+
+export interface VNode<P = {}> extends preact.VNode<P> {
+	// Redefine type here using our internal ComponentType type
+	type: string | ComponentType<P>;
+	props: P & { children: ComponentChildren };
+	ref?: Ref<any> | null;
+	_children: Array<VNode<any>> | null;
+	_parent: VNode | null;
+	_depth: number | null;
+	/**
+	 * The [first (for Fragments)] DOM child of a VNode
+	 */
+	_dom: PreactElement | null;
+	/**
+	 * The last dom child of a Fragment, or components that return a Fragment
+	 */
+	_nextDom: PreactElement | null;
+	_component: Component | null;
+	_hydrating: boolean | null;
+	constructor: undefined;
+	_original: number;
+}
+
+export interface Component<P = {}, S = {}> extends preact.Component<P, S> {
+	// When component is functional component, this is reset to functional component
+	constructor: ComponentType<P>;
+	state: S; // Override Component["state"] to not be readonly for internal use, specifically Hooks
+	base?: PreactElement;
+
+	_dirty: boolean;
+	_force?: boolean;
+	_renderCallbacks: Array<() => void>; // Only class components
+	_globalContext?: any;
+	_vnode?: VNode<P> | null;
+	_nextState?: S | null; // Only class components
+	/** Only used in the devtools to later dirty check if state has changed */
+	_prevState?: S | null;
+	/**
+	 * Pointer to the parent dom node. This is only needed for top-level Fragment
+	 * components or array returns.
+	 */
+	_parentDom?: PreactElement | null;
+	// Always read, set only when handling error
+	_processingException?: Component<any, any> | null;
+	// Always read, set only when handling error. This is used to indicate at diffTime to set _processingException
+	_pendingError?: Component<any, any> | null;
+}
+
+export interface PreactContext extends preact.Context<any> {
+	_id: string;
+	_defaultValue: any;
+}