export declare function positiveInteger(raw: string | undefined, label: string): number | undefined;
export declare function nonNegativeInteger(raw: string | undefined, label: string): number | undefined;
export declare function positiveDuration(raw: string | undefined, label: string): number | undefined;
export declare function timeoutDuration(raw: string | undefined, label: string): number | null | undefined;
export declare function idleTimeoutDuration(raw: string | undefined, label: string): number | undefined;
export declare function splitList(value: string | undefined): string[] | undefined;
export declare function listFromRepeatedOpts(value: string[] | undefined): string[] | undefined;
export declare function collectValues(value: string, previous?: string[]): string[];