/**
 * Utilities for parsing and merging HTTP headers from CLI/config.
 */
/**
 * Parse CLI --header values ("Name: value") into a validated header map.
 */
export declare function parseCliHeaders(values?: string[]): Record<string, string> | undefined;
/**
 * Merge two header maps case-insensitively, with override precedence.
 */
export declare function mergeHeaders(base?: Record<string, string>, override?: Record<string, string>): Record<string, string> | undefined;
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