import type { ReviewerProviderConfig } from './reviewer-config.js';
export type SelectionMode = 'round-robin' | 'hash' | 'random';
export type SelectionResult = {
    provider: ReviewerProviderConfig;
    index: number;
    /** Monotonic call counter for `round-robin` (1-based). */
    callNumber: number;
};
export type RoundRobinState = {
    mode: 'round-robin';
    cursor: number;
};
export type SelectionState = RoundRobinState;
export declare function initialState(): SelectionState;
/** Round-robin: cycles across the provider array across calls. */
export declare function selectRoundRobin(providers: ReadonlyArray<ReviewerProviderConfig>, state: SelectionState, rid: string): {
    result: SelectionResult;
    nextState: SelectionState;
};
/** Hash(rid): stable, deterministic; same rid always yields same provider. */
export declare function selectHash(providers: ReadonlyArray<ReviewerProviderConfig>, rid: string): SelectionResult;
/** Random: uniform sample; supports a seeded RNG for testability. */
export declare function selectRandom(providers: ReadonlyArray<ReviewerProviderConfig>, rid: string, rng?: () => number): SelectionResult;
export declare function selectByMode(mode: SelectionMode, providers: ReadonlyArray<ReviewerProviderConfig>, rid: string, state: SelectionState, rng?: () => number): {
    result: SelectionResult;
    nextState: SelectionState;
};