/**
 * Viewer plugin registry — runtime registration + slot-aware lookup.
 *
 * Plugin packs call `register(plugin)` during module load (typically
 * from a top-level `register.ts` the consumer imports for side
 * effects). The viewer reads `getPluginsForSlot(slot)` at render
 * time to find what to mount.
 *
 * The registry is process-wide. Apps mounting two viewer instances on
 * the same page currently share the same plugin set; per-instance
 * scoping is a future addition.
 *
 * @public
 */
import type { ViewerPlugin, ViewerSlot } from "./types";
/**
 * Register a plugin. Throws on duplicate id, or on a second
 * `replaces` claim against the same target.
 *
 * @public
 */
export declare function register(plugin: ViewerPlugin): void;
/**
 * Unregister a plugin by id. No-op if absent. Also clears any
 * `replaces` claim this plugin held, freeing the target for a
 * subsequent override.
 *
 * @public
 */
export declare function unregister(id: string): void;
/**
 * Return every registered plugin for a slot, sorted by `order` asc
 * (where supported by the plugin shape; defaults to insertion order).
 *
 * Plugins that have been overridden via another plugin's `replaces`
 * field are filtered out — the overrider takes their place when it
 * shares the same slot. Cross-slot overrides also remove the
 * original from this slot (the override declares an intent to take
 * over the named feature; rendering the replaced one alongside
 * would defeat the override semantics).
 *
 * @public
 */
export declare function getPluginsForSlot<S extends ViewerSlot>(slot: S): Array<Extract<ViewerPlugin, {
    slot: S;
}>>;
/**
 * Snapshot of every registered plugin (mainly for tests / debugging).
 * Includes plugins that have been overridden — `getPluginsForSlot`
 * filters those out, but they remain in the registry.
 *
 * @public
 */
export declare function listAll(): ReadonlyArray<ViewerPlugin>;
/**
 * Reset the registry. **Test-only.** Production code never calls this.
 *
 * @public
 */
export declare function _resetRegistryForTesting(): void;
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