import type { CioConfig, CustomAttributes } from '../types';
/**
 * Returns true if the value is undefined or null.
 */
declare function isUndefined(value: unknown): boolean;
/**
 * Validates that a value is a string.
 * Throws if the value is not a string, or if it's empty (unless allowEmpty is true).
 */
declare function validateString(value: unknown, fieldName: string, options?: {
    allowEmpty?: boolean;
    usage?: string;
    optional?: boolean;
}): void;
/**
 * Validates that a value is a plain object (not null or an array).
 */
declare function validateRecord(value: unknown, fieldName: string, options?: {
    usage?: string;
    expectedType?: string;
    optional?: boolean;
}): void;
/**
 * Validates that a value is a valid CustomAttributes object.
 * Automatically converts Map objects to plain objects for compatibility.
 * This is a specialized version of validateRecord optimized for attribute validation.
 */
declare function validateAttributes(value: unknown, fieldName: string, options?: {
    usage?: string;
    expectedType?: string;
    optional?: boolean;
}): CustomAttributes | undefined;
type ConfigValidator = (value: unknown) => asserts value is CioConfig;
export declare const assert: {
    string: typeof validateString;
    record: typeof validateRecord;
    attributes: typeof validateAttributes;
    config: ConfigValidator;
};
export declare const validate: {
    isUndefined: typeof isUndefined;
};
export {};
//# sourceMappingURL=param-validation.d.ts.map