export declare function isBlankInput(value: unknown): boolean;
export declare function readOptional(input: Record<string, unknown>, ...keys: readonly string[]): unknown;
export declare function readOptionalString(input: Record<string, unknown>, key: string, label?: string): string | undefined;
export declare function readOptionalAliasString(input: Record<string, unknown>, keys: readonly string[], label: string): string | undefined;
export declare function readOptionalNumber(input: Record<string, unknown>, key: string, label?: string): number | undefined;