/** @internal */
export declare function isObject(value: any): value is object;
/** @internal */
export declare function isArray(value: any): value is unknown[];
/** @internal */
export declare function isUndefined<T>(value: T | undefined): value is undefined;
/** @internal */
export declare function isString(value: any): value is string;
/** @internal */
export declare function isNumber(value: any): value is number;
/** @internal */
export declare function isBoolean(value: any): value is boolean;