why my custom extension for turbowarp doesnt work? so im trying to make a numeral encoder/decoder for turbowarp and im having problem that my extension not loading successfully into turbo warp when importing it. this is also question on how to make turbowarp extension since i just started creating turbowarp extesions.

const numeralEncoder = {
  id: 'numeralEncoder',
  name: 'Numeral Encoder/Decoder',
  blocks: [
    {
      opcode: 'encodeToNumbers',
      blockType: 'reporter',
      text: 'encode [text] to numbers',
      arguments: {
        text: {
          type: 'string',
          defaultValue: 'Hello'
        }
      },
      func: function(args) {
        return this.encodeToNumbers(args.text);
      }
    },
    {
      opcode: 'decodeFromNumbers',
      blockType: 'reporter',
      text: 'decode [numbers] to text',
      arguments: {
        numbers: {
          type: 'string',
          defaultValue: '72,101,108,108,111'
        }
      },
      func: function(args) {
        return this.decodeFromNumbers(args.numbers);
      }
    }
  ],

  encodeToNumbers: function(text) {
    const asciiValues = [];
    for (let i = 0; i < text.length; i++) {
      asciiValues.push(text.charCodeAt(i));
    }
    return asciiValues.join(',');
  },

  decodeFromNumbers: function(numbers) {
    const asciiValues = numbers.split(',').map(Number);
    let decodedString = '';
    for (let i = 0; i < asciiValues.length; i++) {
      decodedString += String.fromCharCode(asciiValues[i]);
    }
    return decodedString;
  }
};

Extension.register(numeralEncoder);