/**
 * Plugin Registry CRUD
 *
 * Manages the plugin registry file using atomic writes for crash safety.
 * The registry tracks all installed plugins, their versions, and metadata.
 */
import { PluginRegistry, PluginRegistryEntry, PluginScope } from "./types";
/**
 * Reads the plugin registry from disk.
 * Returns an empty registry if the file does not exist.
 *
 * @param scope - Whether to read the global or project registry
 * @param projectDir - Required when scope is 'project'
 */
export declare function readPluginRegistry(scope: PluginScope, projectDir?: string): Promise<PluginRegistry>;
/**
 * Writes the plugin registry to disk using an atomic write.
 *
 * @param registry - The full registry object to persist
 * @param scope - Whether to write the global or project registry
 * @param projectDir - Required when scope is 'project'
 */
export declare function writePluginRegistry(registry: PluginRegistry, scope: PluginScope, projectDir?: string): Promise<void>;
/**
 * Looks up a plugin entry by name in the registry.
 * Returns undefined if the plugin is not registered.
 *
 * @param registry - The registry to search
 * @param pluginName - The plugin identifier to look up
 */
export declare function getPluginEntry(registry: PluginRegistry, pluginName: string): PluginRegistryEntry | undefined;
/**
 * Returns a new registry with the given entry inserted or updated.
 * Sets the registry's updatedAt timestamp. Does not mutate the input.
 *
 * @param registry - The current registry
 * @param entry - The plugin entry to insert or update
 */
export declare function upsertPluginEntry(registry: PluginRegistry, entry: PluginRegistryEntry): PluginRegistry;
/**
 * Returns a new registry with the named plugin removed.
 * Does not mutate the input. Throws if the plugin is not found.
 *
 * @param registry - The current registry
 * @param pluginName - The plugin identifier to remove
 */
export declare function removePluginEntry(registry: PluginRegistry, pluginName: string): PluginRegistry;
/**
 * Returns all plugin entries as a sorted array (sorted by name).
 *
 * @param registry - The registry to list
 */
export declare function listPluginEntries(registry: PluginRegistry): PluginRegistryEntry[];
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