/**
 * Validation Utilities
 * Common validation functions for API operations
 */
/**
 * Check if a number is within a specific range (inclusive)
 */
export declare function isInRange(value: number, min: number, max: number): boolean;
/**
 * Parse and validate a numeric string within a range
 */
export declare function parseAndValidateNumber(value: string | null, min: number, max: number, parser?: (value: string) => number): number | null;
/**
 * Validate that a value is one of the allowed enum values
 */
export declare function isValidEnumValue<T extends string>(value: string, allowedValues: readonly T[]): value is T;
/**
 * Normalize headers from Headers API or plain object to lowercase key object
 */
export declare function normalizeHeaders(headers: Headers | Record<string, string | string[] | undefined>): Record<string, string>;
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