Marc Wieland
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34 lines
1.0 KiB
TypeScript
34 lines
1.0 KiB
TypeScript
export const getOwnerDocument = (el: Element | null | undefined): Document => {
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return el?.ownerDocument ?? document;
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};
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export const getOwnerWindow = (
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el: (Window & typeof global) | Element | null | undefined
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): Window & typeof global => {
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if (el && 'window' in el && el.window === el) {
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return el;
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}
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const doc = getOwnerDocument(el as Element | null | undefined);
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return doc.defaultView || window;
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};
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/**
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* Type guard that checks if a value is a Node. Verifies the presence and type of the nodeType property.
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*/
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function isNode(value: unknown): value is Node {
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return value !== null &&
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typeof value === 'object' &&
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'nodeType' in value &&
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typeof (value as Node).nodeType === 'number';
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}
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/**
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* Type guard that checks if a node is a ShadowRoot. Uses nodeType and host property checks to
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* distinguish ShadowRoot from other DocumentFragments.
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*/
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export function isShadowRoot(node: Node | null): node is ShadowRoot {
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return isNode(node) &&
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node.nodeType === Node.DOCUMENT_FRAGMENT_NODE &&
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'host' in node;
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}
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