import { IVector3 } from '@easytwin/runtime';
export declare function isNil(v: unknown): v is null | undefined;
export declare function isString(value: unknown): value is string;
export declare function isObject(data: unknown): boolean;
export declare function isArray(arr: unknown): arr is unknown[];
export declare function isNumber(value: any): value is number;
export type IVector3Like = IVector3 & Record<string, any>;
export declare function isIVector3Array(obj: unknown, isStrict: true): obj is IVector3[];
export declare function isIVector3Array(obj: unknown, isStrict: false): obj is IVector3Like[];
export declare function isLonLatArray(obj: unknown): obj is {
    lon: number;
    lat: number;
    alt: number;
}[];