import type { GadgetDescriptor } from '../types/data-contract.js';
/**
 * Resolve an app's effective gadget set from its three sources, in
 * ascending precedence: the first-party stdlib package is the
 * structural FLOOR, `installed` (rows added through the host's install
 * surface) layers on top of it, and `declared` (app-declared extensions
 * from the app's own config) wins over both. Later wins on a `package`
 * collision — declared beats installed beats floor, because the app's
 * own config is the operator's explicit source of truth and must not be
 * silently shadowed by an install performed elsewhere.
 *
 * Absent/empty sources ⇒ exactly the stdlib set; idempotent over
 * already-resolved input.
 */
export declare function resolveAppGadgets(declared?: readonly GadgetDescriptor[] | null, installed?: readonly GadgetDescriptor[] | null): readonly GadgetDescriptor[];
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