/**
 * Parse a flag value that may be a literal JSON string or `@file.json`.
 * Returns undefined for undefined input so callers can skip the field.
 * Throws a descriptive Error on bad input (callers should let handleError format it).
 */
export declare function parseJsonFlag(value: string | undefined, flagName: string): unknown;
/** Parse a comma-separated list flag into a string[] (trims, drops empties). */
export declare function parseListFlag(value: string | undefined): string[] | undefined;
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