import { type DeepPartial } from "./deep-merge.js";
/**
 * Merge per-environment config maps. Useful when composing a child
 * monorepo package's `perEnv` on top of a shared base, outside of the
 * `extends` field on {@link defineSettings}.
 *
 * Semantics: for every env key found across `base` and `overrides`,
 * deepMerge the branches in argument order. Branches that exist only in
 * one of the maps are passed through unchanged.
 *
 * @example
 * ```ts
 * const merged = mergePerEnv(basePerEnv, {
 *   local: { bucket: 'local-content' },
 *   prod:  { bucket: 'prod-content' },
 * });
 * ```
 */
export declare function mergePerEnv<TConfig extends object>(base: Record<string, DeepPartial<TConfig>>, ...overrides: Array<Record<string, DeepPartial<TConfig>>>): Record<string, DeepPartial<TConfig>>;
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