/**
 * Validation Utility Functions
 */
/**
 * Type guard to check if value is string
 */
export declare const isString: (value: unknown) => value is string;
/**
 * Type guard to check if value is defined (not undefined)
 */
export declare const isDefined: <T>(value: T | undefined) => value is T;
/**
 * Type guard to check if value is number
 */
export declare const isNumber: (value: unknown) => value is number;
/**
 * Helper function to get all valid provider types as array
 */
export declare const getValidProviders: () => string[];
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