import type { CustomModelDefinition } from '../types/config.js';
/**
 * Merge per-provider `customModels` into top-level `configModels`.
 *
 * Keys present in `configModels` always win over `providerCustomModels`
 * when the same model id appears in both places. This lets the user
 * override provider-attached definitions from the top-level config.
 *
 * Pure: never mutates its inputs.
 */
export declare function mergeCustomModelDefs(providerCustomModels: Record<string, CustomModelDefinition> | undefined, configModels: Record<string, CustomModelDefinition> | undefined): Record<string, CustomModelDefinition> | undefined;
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