import type { ConfigService } from 'hive-core';
export declare function normalizeVariant(variant: string | undefined): string | undefined;
export declare function createVariantHook(configService: ConfigService): (input: {
    sessionID: string;
    agent?: string;
    model?: {
        providerID: string;
        modelID: string;
    };
    messageID?: string;
    variant?: string;
}, output: {
    message: {
        variant?: string;
    };
    parts: unknown[];
}) => Promise<void>;