/**
 * S2 — the pinned app's remembered silhouette.
 *
 * A slot repaints its skeleton on EVERY mount (use-app.ts refetches get+open
 * and the server re-runs the screen), so the wait is honest but shapeless: a
 * generic shimmer standing in front of an app the person has already seen.
 * This remembers what its BOXES look like — layout only, never a value — so the
 * next wait is drawn in the shape of the thing that is coming.
 *
 * Same storage manners as discoverability.ts and last-thread.ts: one `vendo:`
 * key per app, and degraded environments (SSR, sandboxed iframe, blocked or
 * full storage) read as "nothing remembered" while writes stay silent.
 */
import { type UIPayload } from "../../core/index.js";
import { type FormShape } from "../tree/forming-skeleton.js";
/** One bone. `line` is a kit VALUE (Text, a Link, an Icon) — one typographic line
 *  whatever the datum behind it; every other kind is deriveFormShape's own
 *  vocabulary, unchanged. */
export interface ShapeBox {
    kind: FormShape | "line";
}
/** What one app's key holds. `v` is the served tree's content hash, so an edit
 *  replaces the silhouette instead of outliving it. */
export interface AppShape {
    v: string;
    boxes: ShapeBox[];
}
/** The remembered silhouette. Nothing stored, a record we cannot read, or an
 *  app with no bones all answer undefined — the slot falls back to the calm
 *  generic ghost. */
export declare function rememberedShape(appId: string): ShapeBox[] | undefined;
/** The silhouette this SLOT last held — what it waits in while the placements
 *  read is still in flight and the app coming back is not named yet. Without one
 *  the slot falls back to the generic ghost; either way it must not paint the
 *  empty-slot invite, which is a claim about a slot nothing is pinned in. */
export declare function rememberedSlotShape(slotId: string): ShapeBox[] | undefined;
/** Remember which app is in this slot. Best-effort, like every write here. */
export declare function rememberSlotApp(slotId: string, appId: string): void;
/** Remember what the served tree looks like. Only a tree surface has insides we
 *  can see, so an iframe-served app never reaches here and keeps the generic
 *  ghost forever. Best-effort, and a no-op when this version is already held. */
export declare function rememberShape(appId: string, payload: UIPayload): void;