export declare function validateString(value: unknown, field: string): asserts value is string;
export declare function validateOptionalString(value: unknown, field: string): asserts value is string | null | undefined;
export declare function validateObject(value: unknown, field: string): asserts value is Record<string, undefined>;
export declare function validateOptionalObject(value: unknown, field: string): asserts value is Record<string, unknown> | null | undefined;
export declare function validateOptionalDate(value: unknown, field: string): asserts value is Date | null | undefined;
export declare function createValidationError(message: string): Error;
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