/**
 * Deep merge utilities for @a5c-ai/agent-mux.
 *
 * Used to layer RunOptions from multiple sources (global defaults,
 * profile, client defaults, explicit options) into a single resolved
 * configuration.
 */
/**
 * Return a shallow copy of `obj` with all keys whose value is `undefined` removed.
 * Returns `{}` for null/undefined input.
 */
export declare function stripUndefined<T extends Record<string, unknown>>(obj: T | null | undefined): Partial<T>;
/**
 * Deep merge two objects according to agent-mux merge semantics:
 *
 * - Scalars: override replaces base.
 * - Arrays: override replaces base (no concatenation).
 * - Plain objects: shallow-merge one level deep.
 * - `undefined` values in override are skipped (base value preserved).
 * - `null` in override replaces base (explicit clear).
 *
 * @param base - The base layer.
 * @param override - The override layer.
 * @returns A new merged object (neither input is mutated).
 */
export declare function deepMerge<T extends Record<string, unknown>>(base: T, override: Partial<T> | undefined | null): T;
/**
 * Resolve run options by merging multiple layers in order.
 *
 * Layers are applied left to right; later layers override earlier ones.
 * Uses the same merge semantics as `deepMerge`, making it the canonical
 * helper for layering run-option-like objects and defaults.
 *
 * @param layers - Ordered list of option layers to merge.
 * @returns The merged result.
 */
export declare function resolveRunOptions<T extends Record<string, unknown>>(...layers: Array<Partial<T> | undefined | null>): T;