method path.PlatformPath.extname
          
Usage in Deno
import { type path } from "node:path";
PlatformPath.extname(path: string): string 
      Return the extension of the path, from the last '.' to end of string in the last portion of the path. If there is no '.' in the last portion of the path or the first character of it is '.', then it returns an empty string.
string
      
    TypeError
      
    if path is not a string.