import type { LanguageModelV4, LanguageModelV4CallOptions } from "@ai-sdk/provider";
import type { ResolvedEntry } from "./stream.js";
import type { RouterAdmissionSnapshot, RouterHealthSnapshot, RouterRetryBudgetSnapshot } from "./types.js";
/**
 * A candidate entry normalized to a single internal shape, regardless of which
 * of the three accepted `ProviderEntry` forms the user wrote.
 */
import { RouterModelConfig } from "./router-model-config.js";
export declare abstract class RouterModelState extends RouterModelConfig {
    protected computeSupportedUrls(): Promise<Record<string, RegExp[]>> | Record<string, RegExp[]>;
    healthSnapshot(): RouterHealthSnapshot[];
    admissionSnapshot(): RouterAdmissionSnapshot[];
    retryBudgetSnapshot(): RouterRetryBudgetSnapshot | undefined;
    /**
     * Commit a survivor into cooldown state, but only when reaching it actually
     * involved an earlier candidate failing (`hadFailure`), or when it is the
     * primary recovering (`fullIndex === 0`). A candidate reached merely because
     * earlier entries were modality-filtered out must NOT become sticky —
     * otherwise a later request of a different modality would skip a perfectly
     * healthy higher-priority primary. No-op when cooldown is disabled.
     */
    protected commitSurvivor(fullIndex: number, hadFailure: boolean): void;
    protected assertHasCandidate(candidates: ResolvedEntry[]): void;
    /** Lazily instantiate (and cache) the model for a candidate index. */
    protected instantiate(index: number): LanguageModelV4;
    /**
     * Filter entries by the prompt's required modalities and order them for this
     * request. With sticky cooldown, the active survivor is promoted to the head
     * instead of becoming a start offset, so every other compatible candidate
     * remains reachable if that survivor fails.
     */
    protected selectCandidates(options: LanguageModelV4CallOptions, phase: "generate" | "stream-open"): {
        candidates: ResolvedEntry[];
        startIndex: number;
    };
    protected applySelection(candidates: ResolvedEntry[], from?: number): void;
}