import type{PlaceStrategy}from'./positioner.js';
/**
* Resolves which `PlaceStrategy` an anchored overlay should place with, honoring a cascading
* theme-level override so a consumer never has to author `positioning-strategy`/`hoist` on every
* instance living inside the same clipping ancestor (an `overflow: hidden` card, a scroller, or
* the whole document via `:root`).
*
* Precedence, matching the property's own documented contract:
* 1. `explicit` -- the instance's own authored `positioning-strategy`/`hoist` value, for the
*    surfaces that expose one. Always wins. A caller with no such per-instance property passes
*    `undefined` here unconditionally, which falls through to step 2.
* 2. The `--lr-positioning-strategy` custom property, read from `host`'s *computed* style so an
*    ancestor's `:root`/theme/card rule cascades in, but only the recognized `absolute`/`fixed`
*    keywords are honored -- anything else (unset, whitespace, a typo) is not a value this
*    resolves, and falls through.
* 3. `fallback` -- the component's own mirrored default, unchanged for anyone who sets neither.
*
* Reads computed style once per call, so call this at open/reposition time (never per animation
* frame). SSR-safe: `ownerDocument.defaultView` is absent before a client attaches (there is no
* `window` under `@lit-labs/ssr`), so the read is skipped rather than thrown, and `fallback`
* applies -- exactly the value every non-cascading caller already got.
*/
export declare function resolveEffectivePositioningStrategy(host:Element,explicit:PlaceStrategy|undefined,fallback:PlaceStrategy):PlaceStrategy;