/**
 * Extension ref union assembler.
 *
 * Imports per-type concrete refs from feature folders and defines the
 * unified `ExtensionRef` union. This file is a leaf — feature folders
 * import only from `ref-base.ts`, never from this file.
 *
 * @experimental This API is unstable and may change without notice.
 * @packageDocumentation
 */
import type { ExtensionName } from "../common.js";
import type { SkillExtensionRef } from "./skill.js";
import type { McpServerExtensionRef } from "./mcp-server.js";
import type { SubagentExtensionRef } from "./subagent.js";
import type { RuleExtensionRef } from "./rule.js";
import type { HookExtensionRef } from "./hook.js";
import type { KnowledgeExtensionRef } from "./knowledge.js";
import type { PackRef } from "./pack.js";
/** @experimental */
export type ExtensionRef = SkillExtensionRef | McpServerExtensionRef | SubagentExtensionRef | RuleExtensionRef | HookExtensionRef | KnowledgeExtensionRef | PackRef;
/**
 * Whether the source this ref was discovered in holds the package as a copy
 * it acquired from another publisher. Discovery decides this from where the
 * source keeps the package; a held package is installable by name and as a
 * Pack's member, but is not part of what the source offers.
 *
 * @experimental
 */
export declare const sourceHolds: (ref: ExtensionRef) => boolean;
/**
 * The name an extension's own manifest gives it: the configured workspace
 * name it occupies. A Registry ref's `name` is the package the Registry
 * serves it under and may differ; Registry operations use that one.
 *
 * @experimental
 */
export declare const extensionRefName: (ref: ExtensionRef) => ExtensionName;
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