Get a Geohash and sub-geohashes for a Location in map

geohash1.js

var geohash = require('ngeohash');

var opa = geohash.encode(-20.8191497,-49.3989744, 10);

var pair = [ -20.786449, -49.404946]

var encoded = geohash.encode(pair[0],pair[1]);
encoded;
var decoded = geohash.decode(encoded);


geohash.bboxes()

  const possibleGeohashes= [0 ,1 ,2 ,3 ,4 ,5 ,6 ,7 ,8 ,9 ,'b' ,'c' ,'d' ,'e' ,'f' ,'g', 'h' ,'j' ,'k' ,'m' ,'n' ,'p' ,'q' ,'r' ,'s' ,'t' ,'u' ,'v' ,'w' ,'x' ,'y' ,'z'];

function getAllSubGeoHashes() {
   
  
}