@react-three/fiber/dist/declarations/src/core/is.d.ts

A React renderer for Threejs

export declare const is: {
    obj: (a: any) => boolean;
    fun: (a: any) => a is Function;
    str: (a: any) => a is string;
    num: (a: any) => a is number;
    und: (a: any) => boolean;
    arr: (a: any) => boolean;
    equ(a: any, b: any): boolean;
};