export declare const isDefined: (o?: unknown) => boolean;
export declare const isFunction: (o?: unknown) => o is (...params: unknown[]) => unknown;
export declare const isA: <T>(t?: unknown, ...properties: (keyof T)[]) => t is T;
export declare const isAn: <T>(t?: unknown, ...properties: (keyof T)[]) => t is T;
export declare const isArray: <T = any>(o?: unknown) => o is T[];
export declare const isObject: (o?: unknown) => o is Record<string, unknown>;
export declare const asJson: (a?: unknown) => any;
export declare const asString: (a?: unknown) => any;