function isSubdirimport { isSubdir } from "https://deno.land/std@0.166.0/fs/_util.ts"; isSubdir(src: string | URL,dest: string | URL,sep?: string,): booleanTest whether or not dest is a sub-directory of src Parameterssrc: string | URLsrc file path dest: string | URLdest file path optionalsep: string = [UNSUPPORTED]path separator Returnsboolean