/**
 * Opaque pre-activation state for deferred built-in extensions.
 *
 * Public extension APIs continue to accept `ResolvedExtension`. A branded
 * resolved value lets the internal loader defer materializing first-party
 * implementations until after merge priority and disable filtering, without
 * exposing a second extension-authoring contract.
 */
import type { Extension, ExtensionLogger, ExtensionSource, ResolvedExtension } from "./types.js";
export interface DeferredExtensionState {
    readonly expectedName: string;
    readonly load: (logger: ExtensionLogger) => Promise<Extension | undefined>;
}
export declare function createDeferredResolvedExtension(input: {
    readonly name: string;
    readonly source: ExtensionSource;
    readonly origin: string;
    readonly load: DeferredExtensionState["load"];
}): ResolvedExtension;
export declare function getDeferredExtensionState(candidate: ResolvedExtension): DeferredExtensionState | undefined;
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