import type { LanguageModelV4 } from "@ai-sdk/provider";
import type { NormalizedEntry } from "./router-entry.js";
import type { Modality } from "./types.js";
export declare const STABLE_MODELS: WeakSet<object>;
/** Snapshot callable model operations once while preserving their original `this`. */
export declare function snapshotLanguageModelV4(value: unknown): LanguageModelV4 | undefined;
export declare function snapshotAdaptiveConcurrency(value: unknown): NormalizedEntry["adaptiveConcurrency"];
export declare function snapshotSupports(value: unknown): Modality[] | undefined;