export declare const isDefined: <T>(x: T) => x is NonNullable<T>;
export declare const isNumber: (x: unknown) => x is number;
export declare const isInteger: (x: unknown) => x is number;
export declare const isBoolean: (x: unknown) => x is boolean;
export declare const isString: (s: unknown) => s is string;
export declare const isPlainObject: (x: unknown) => boolean;
export declare const copy: <T extends Record<string | number, any> = Record<string | number, any>>(source: Record<string | number, any>, dest: T, key: string | number) => T;
export declare const makeArray: <T>(maybeArray: T | Array<T>) => T[];