import { Step, StepSide } from '../types';
export declare function isSafeInteger(value: unknown): value is number;
export declare function isSafeNatural(value: unknown): value is number;
/**
 * @param node {unknown} the value to test
 * @param win {Window} the target window contains the object, e.g. iframe.contentWindow
 *
 * If node object is from iframe window, node.__proto__ is the from the iframe
 * so, node instanceof iframe.contentWindow.Node should be true and node instanceof Node should be false
 * Firefox's behavior aligns with above
 * but chrome's result is randomized, so we check both
 */
export declare function isNode(node: unknown, win?: (Window & typeof globalThis) | null | undefined): node is Node;
export declare function isElement(value: Node | EventTarget): value is Element;
export declare function isTextInputElement(element: Element): boolean;
export declare function checkElementType<K extends keyof HTMLElementTagNameMap>(key: K): (node: Element) => node is HTMLElementTagNameMap[K];
export declare const HTML_NAMESPACE = "http://www.w3.org/1999/xhtml";
export declare const SVG_NAMESPACE = "http://www.w3.org/2000/svg";
export declare const MATH_ML_NAMESPACE = "http://www.w3.org/1998/Math/MathML";
export declare function isHTMLElement(element: Element): element is HTMLElement;
export declare function isSVGElement(element: Element): element is SVGElement;
export declare function isMathMLElement(element: Element): element is MathMLElement;
export declare function isEventTargetNode(value: EventTarget | null): value is Node;
export declare function isPrimaryStep<StepExtension>(step: Step<StepExtension> | StepSide<StepExtension>): step is Step<StepExtension>;
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