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/** Returns whether global `window` and `document` objects are available at invocation time. @public */
export function hasDOM(): boolean {
return typeof window !== 'undefined' && typeof document !== 'undefined';
}
/** Registers a DOM listener and returns idempotent cleanup. @internal */
export function listen<TEvent extends Event>(
target: EventTarget,
type: string,
listener: (event: TEvent) => void,
options?: AddEventListenerOptions | boolean,
): Unsubscribe {
const callback: EventListener = (event) => listener(event as TEvent);
target.addEventListener(type, callback, options);
let active = true;
return () => {
if (!active) return;
active = false;
target.removeEventListener(type, callback, options);
};
}
/** Resolves an element's document without consulting the global document first. @internal */
export function getOwnerDocument(element?: Node | null): Document | undefined {
return element?.ownerDocument ?? (hasDOM() ? document : undefined);
}
/** Resolves a node's owning window without preferring the ambient global realm. @internal */
export function getOwnerWindow(element?: Node | null): Window | undefined {
if (element?.nodeType === 9) return (element as Document).defaultView ?? undefined;
return getOwnerDocument(element)?.defaultView ?? undefined;
}
/** @internal */
export function isHTMLElement(value: unknown, ownerDocument?: Document): value is HTMLElement {
if (!value || typeof value !== 'object') return false;
const document = ownerDocument ?? (value as Node).ownerDocument;
const Constructor = document?.defaultView?.HTMLElement;
return Boolean(Constructor && value instanceof Constructor);
}
/** @internal */
export function isHTMLInputElement(value: unknown): value is HTMLInputElement {
if (!value || typeof value !== 'object') return false;
const Constructor = (value as Node).ownerDocument?.defaultView?.HTMLInputElement;
return Boolean(Constructor && value instanceof Constructor);
}
/** @internal */
export function isKeyboardLikeEvent(event: Event): event is KeyboardEvent {
return 'key' in event && typeof event.key === 'string';
}
/** @internal */
export function isAbortError(error: unknown): boolean {
return Boolean(
error && typeof error === 'object' && 'name' in error && error.name === 'AbortError',
);
}
/** Tests containment across shadow DOM using the event composed path when available. @internal */
export function eventTargets(event: Event, boundary: Node): boolean {
return event.composedPath().includes(boundary) || boundary.contains(event.target as Node | null);
}
/** Options for document-level outside interaction observation. @internal */
export interface OutsideInteractionOptions {
/** Element considered inside the owning overlay. */
readonly boundary: Element;
/** Additional descendant overlays that should be treated as inside. */
readonly branches?: readonly Element[];
/** Receives pointer interactions outside all boundaries. */
readonly onPointerOutside?: (event: PointerEvent) => void;
/** Receives focus transitions outside all boundaries. */
readonly onFocusOutside?: (event: FocusEvent) => void;
}
/** Document-level pointer and focus callbacks shared by overlay dispatchers. @internal */
export interface DocumentInteractionOptions {
/** Document whose capture phase should be observed. */
readonly ownerDocument: Document;
/** Receives every captured pointer-down interaction. */
readonly onPointerDown?: (event: PointerEvent) => void;
/** Receives every captured focus-in interaction. */
readonly onFocusIn?: (event: FocusEvent) => void;
}
/** Observes document pointer and focus interactions with one idempotent cleanup. @internal */
export function observeDocumentInteraction(options: DocumentInteractionOptions): Unsubscribe {
const cleanups = [
listen<PointerEvent>(
options.ownerDocument,
'pointerdown',
(event) => {
options.onPointerDown?.(event);
},
true,
),
listen<FocusEvent>(
options.ownerDocument,
'focusin',
(event) => {
options.onFocusIn?.(event);
},
true,
),
];
return () =>
cleanups
.splice(0)
.reverse()
.forEach((cleanup) => cleanup());
}
/** Observes outside pointer and focus interactions and returns complete cleanup. @internal */
export function observeOutsideInteraction(options: OutsideInteractionOptions): Unsubscribe {
const ownerDocument = options.boundary.ownerDocument;
const isInside = (event: Event): boolean =>
eventTargets(event, options.boundary) ||
(options.branches?.some((branch) => eventTargets(event, branch)) ?? false);
return observeDocumentInteraction({
ownerDocument,
onPointerDown(event) {
if (!isInside(event)) options.onPointerOutside?.(event);
},
onFocusIn(event) {
Eif (!isInside(event)) options.onFocusOutside?.(event);
},
});
}
const scrollLocks = new WeakMap<Document, { count: number; overflow: string }>();
/** Acquires a reference-counted document scroll lock and returns a release function. @internal */
export function lockDocumentScroll(ownerDocument: Document): Unsubscribe {
const current = scrollLocks.get(ownerDocument);
if (current) current.count += 1;
else {
scrollLocks.set(ownerDocument, {
count: 1,
overflow: ownerDocument.documentElement.style.overflow,
});
ownerDocument.documentElement.style.overflow = 'hidden';
}
let active = true;
return () => {
if (!active) return;
active = false;
const lock = scrollLocks.get(ownerDocument);
Iif (!lock) return;
lock.count -= 1;
if (lock.count === 0) {
ownerDocument.documentElement.style.overflow = lock.overflow;
scrollLocks.delete(ownerDocument);
}
};
}
interface InertLayer {
readonly element: Element;
readonly branches: readonly Element[];
readonly order: number;
readonly token: symbol;
}
interface InertDocumentState {
readonly layers: InertLayer[];
readonly originals: Map<
HTMLElement,
{ readonly inert: boolean; readonly ariaHidden: string | null }
>;
}
const inertDocuments = new WeakMap<Document, InertDocumentState>();
const reconcileInertDocument = (ownerDocument: Document, state: InertDocumentState): void => {
const topLayer = state.layers.at(-1);
for (const [element, original] of state.originals) {
if (!element.isConnected) continue;
element.inert = original.inert;
if (original.ariaHidden === null) element.removeAttribute('aria-hidden');
else element.setAttribute('aria-hidden', original.ariaHidden);
}
if (!topLayer) return;
const candidates = [...new Set([topLayer.element, ...topLayer.branches])].filter(
(candidate) =>
candidate.ownerDocument === ownerDocument &&
![topLayer.element, ...topLayer.branches].some(
(other) => other !== candidate && other.contains(candidate),
),
);
const activeChildren = new Map<Element, Set<Element>>();
for (const candidate of candidates) {
let activeBranch = candidate;
while (activeBranch.parentElement) {
const parent = activeBranch.parentElement;
const children = activeChildren.get(parent) ?? new Set<Element>();
children.add(activeBranch);
activeChildren.set(parent, children);
if (parent === ownerDocument.body) break;
activeBranch = parent;
}
}
for (const [parent, children] of activeChildren) {
for (const sibling of parent.children) {
if (children.has(sibling) || !isHTMLElement(sibling, ownerDocument)) continue;
if (!state.originals.has(sibling)) {
state.originals.set(sibling, {
inert: sibling.inert,
ariaHidden: sibling.getAttribute('aria-hidden'),
});
}
sibling.inert = true;
sibling.setAttribute('aria-hidden', 'true');
}
}
};
/**
* Makes document siblings inert while preserving and restoring their previous state.
*
* @remarks Nested modal layers are coordinated per document. Only the topmost modal branch remains
* interactive, and releasing layers out of order cannot restore the background prematurely.
* @internal
*/
export function inertSiblings(
element: Element,
branches: readonly Element[] = [],
order = Number.MAX_SAFE_INTEGER,
): Unsubscribe {
const ownerDocument = element.ownerDocument;
const state: InertDocumentState = inertDocuments.get(ownerDocument) ?? {
layers: [],
originals: new Map(),
};
const layer = { element, branches, order, token: Symbol('inert-layer') };
const insertionIndex = state.layers.findIndex((candidate) => candidate.order > order);
if (insertionIndex < 0) state.layers.push(layer);
else Estate.layers.splice(insertionIndex, 0, layer);
inertDocuments.set(ownerDocument, state);
reconcileInertDocument(ownerDocument, state);
let active = true;
return () => {
Iif (!active) return;
active = false;
const index = state.layers.findIndex((candidate) => candidate.token === layer.token);
Eif (index >= 0) state.layers.splice(index, 1);
reconcileInertDocument(ownerDocument, state);
if (state.layers.length === 0) {
state.originals.clear();
inertDocuments.delete(ownerDocument);
}
};
}
/** Returns scrollable ancestors that can affect anchored positioning. @internal */
export function getScrollableAncestors(element: Element): readonly Element[] {
const result: Element[] = [];
let parent = element.parentElement;
while (parent) {
const style = parent.ownerDocument.defaultView?.getComputedStyle(parent);
if (
style &&
/(auto|scroll|overlay)/u.test(`${style.overflow}${style.overflowX}${style.overflowY}`)
) {
result.push(parent);
}
parent = parent.parentElement;
}
return result;
}
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