/**
 * Provides the nearest overlay layer (e.g. Dialog) to
 * descendant portaled popups (Combobox, Select, etc.) so they can render above
 * the overlay rather than behind it.
 *
 * DialogContent reads its own computed z-index and provides it through this
 * context. Portaled popup components consume it and
 * apply `zIndex: value + 1` as an inline style, guaranteeing they stack on top
 * of whatever overlay contains them — regardless of the specific z-index value.
 *
 * When no overlay layer is present the context is `undefined` and consumers
 * fall back to their default class-based z-index (`z-50`).
 */
export declare const PopupLayerContext: import("react").Context<HTMLDivElement | undefined>;
