/**
 * Type Guard Utilities
 * Common type checking and validation utilities
 */
/**
 * Check if value is a string
 */
export declare function isString(value: unknown): value is string;
/**
 * Check if value is a number
 */
export declare function isNumber(value: unknown): value is number;
/**
 * Check if value is a boolean
 */
export declare function isBoolean(value: unknown): value is boolean;
/**
 * Check if value is a function
 */
export declare function isFunction(value: unknown): value is (...args: unknown[]) => unknown;
/**
 * Check if string is not empty (not null, undefined, or empty string)
 */
export declare function isNonEmptyString(value: unknown): value is string;
/**
 * Check if value is a valid number (finite and not NaN)
 */
export declare function isValidNumber(value: unknown): value is number;
/**
 * Check if value is a positive number
 */
export declare function isPositiveNumber(value: unknown): value is number;
/**
 * Check if value is a non-negative number (>= 0)
 */
export declare function isNonNegativeNumber(value: unknown): value is number;
/**
 * Check if value is an integer
 */
export declare function isInteger(value: unknown): value is number;
/**
 * Check if value is a Promise
 */
export declare function isPromise<T = unknown>(value: unknown): value is Promise<T>;
/**
 * Type guard to check if an error is an Error instance
 */
export declare function isError(value: unknown): value is Error;
/**
 * Check if all values in array pass a type guard
 */
export declare function arrayOf<T>(typeGuard: (value: unknown) => value is T): (value: unknown) => value is T[];
/**
 * Create a union type guard from multiple type guards
 */
export declare function oneOf<T extends readonly unknown[]>(...typeGuards: {
    [K in keyof T]: (value: unknown) => value is T[K];
}): (value: unknown) => value is T[number];
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