/**
 * Returns the value following a CLI option, failing fast when the option is
 * present without a concrete value.
 *
 * @throws {CliUsageError} When the option is present without a value.
 */
export declare function getOptionValue(args: readonly string[], optionName: string): string | undefined;
/**
 * Returns the single value provided for a non-repeatable CLI option, rejecting
 * duplicate occurrences instead of silently choosing one.
 */
export declare function getSingleOptionValue(args: readonly string[], optionName: string): string | undefined;
/**
 * Returns every value provided for a repeatable CLI option, rejecting valueless
 * occurrences instead of accidentally consuming the next flag as data.
 */
export declare function getOptionValues(args: readonly string[], optionName: string): string[];
/**
 * Returns whether a CLI flag was provided, rejecting duplicate occurrences.
 */
export declare function hasSingleFlag(args: readonly string[], flagName: string): boolean;