react-fiber-traverse/src/utils.ts

import * as React from 'react';
import { FiberNode, FiberNodeisHTMLLike, FiberNodeForFunctionComponent, FiberNodeForComponentClass } from './mocked-types';

function isNodeHtmlLike(node: FiberNode): node is FiberNodeisHTMLLike {
    return (typeof node.type === "string") || node.type === null;
}

function isNodeNotHtmlLike(node: FiberNode): node is Exclude<FiberNode, FiberNodeisHTMLLike> {
    return !isNodeHtmlLike(node);
}

function isNodeFunctionComponent(node: FiberNode): node is FiberNodeForFunctionComponent {
    return isNodeNotHtmlLike(node) && node.stateNode === null;
}

function isNodeComponentClass(node: FiberNode): node is FiberNodeForComponentClass {
    return isNodeNotHtmlLike(node) && (node.stateNode instanceof React.Component);
}

export { isNodeHtmlLike, isNodeNotHtmlLike, isNodeFunctionComponent, isNodeComponentClass };