/**
 * Generic validation utilities for request parameters and data
 */
export declare function validateRequestParams(params: Record<string, any>, required: string[]): {
    isValid: boolean;
    missing: string[];
};
export declare function isValidJsonString(str: string): boolean;
export declare function isNonEmptyString(value: any): value is string;
export declare function isPositiveNumber(value: any): boolean;
export declare function isValidRange(min: number, max: number, value: number): boolean;
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