problem.js

console.log('Ex 1: Simple');
draw(pyramid, { height: 5, fill: true });
console.log('Ex 2: Simple custom char');
draw(pyramid, { height: 5, fill: true, fillChar: '#' });
console.log('Ex 3: Apply filter');
draw(pyramid, { height: 5, fill: true, filters: [ filterBlock ] });
console.log('Ex 4: Apply more filters');
draw(pyramid, { height: 5, fill: true, filters: [ filterBlock, filterShadow ] });
console.log('Ex 5: Simple custom char (w/ border)');
draw(pyramid, { height: 5, fill: false });
console.log('Ex 6: Apply filter (w/ border)');
draw(pyramid, { height: 5, fill: false, filters: [ filterBlock ] });
console.log('Ex 7: Apply more filters (w/ border)');
draw(pyramid, { height: 5, fill: false, filters: [ filterBlock, filterShadow ] });
console.log('Ex 8: Change renderer');
draw(square, { size: 5, filters: [ filterBlock, filterShadow ] });

result

Ex 1: Simple
    *
   ***
  *****
 *******
*********
Ex 2: Simple custom char
    #
   ###
  #####
 #######
#########
Ex 3: Apply filter
    ▓
   ▓▓▓
  ▓▓▓▓▓
 ▓▓▓▓▓▓▓
▓▓▓▓▓▓▓▓▓
Ex 4: Apply more filters
    ▓░
   ▓▓▓░
  ▓▓▓▓▓░
 ▓▓▓▓▓▓▓░
▓▓▓▓▓▓▓▓▓░
 ░░░░░░░░░
Ex 5: Simple custom char (w/ border)
    *
   * *
  *   *
 *     *
*********
Ex 6: Apply filter (w/ border)
    ▓
   ▓ ▓
  ▓   ▓
 ▓     ▓
▓▓▓▓▓▓▓▓▓
Ex 7: Apply more filters (w/ border)
    ▓░
   ▓░▓░
  ▓░  ▓░
 ▓░    ▓░
▓▓▓▓▓▓▓▓▓░
 ░░░░░░░░░
Ex 8: Change renderer
▓▓▓▓▓░
▓▓▓▓▓░
▓▓▓▓▓░
▓▓▓▓▓░
▓▓▓▓▓░
 ░░░░░