/** A config path whose value the local file replaces whole. Each rule must
 *  also be listed in docs/site/guide/agency-config-file.md. */
export type ConfigMergeRule = {
    path: string;
    why: string;
};
export declare const CONFIG_MERGE_RULES: ConfigMergeRule[];
/**
 * Merge `override` into `base` and return a new object. Objects merge key by
 * key. Arrays, other values, and values at a CONFIG_MERGE_RULES path replace
 * the base value.
 */
export declare function mergeConfig(base: Record<string, any>, override: Record<string, any>): Record<string, any>;