import type { EvalDefaults, EnvironmentConfig } from "../eval/types.js";
import type { VariantOverride } from "./types.js";
interface MergeBase {
    defaults: EvalDefaults;
    environment?: EnvironmentConfig;
}
/**
 * Apply a variant's overrides on top of an eval's resolved config.
 *
 * Merge semantics:
 * - Scalars: replace
 * - Arrays (skills, files, commands): replace entirely (not concatenated)
 * - Maps (mcpServers): deep-merge by key; entries set to `null` are deleted
 * - `null` environment on override: removes the entire environment
 * - Undefined/missing fields: inherit from base unchanged
 */
export declare function mergeVariantOverride(base: MergeBase, override: VariantOverride): MergeBase;
export {};
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