@dip1059/bitcoinjs-lib/src/templates/witnesscommitment/output.js

bitcoinjs-lib with some other btc based network support. Cloned from https://github.com/junderw/bitcoinjs-lib/tree/cashv5

'use strict';
// OP_RETURN {aa21a9ed} {commitment}
Object.defineProperty(exports, '__esModule', { value: true });
const bscript = require('../../script');
const script_1 = require('../../script');
const types = require('../../types');
const typeforce = require('typeforce');
const HEADER = Buffer.from('aa21a9ed', 'hex');
function check(script) {
  const buffer = bscript.compile(script);
  return (
    buffer.length > 37 &&
    buffer[0] === script_1.OPS.OP_RETURN &&
    buffer[1] === 0x24 &&
    buffer.slice(2, 6).equals(HEADER)
  );
}
exports.check = check;
check.toJSON = () => {
  return 'Witness commitment output';
};
function encode(commitment) {
  typeforce(types.Hash256bit, commitment);
  const buffer = Buffer.allocUnsafe(36);
  HEADER.copy(buffer, 0);
  commitment.copy(buffer, 4);
  return bscript.compile([script_1.OPS.OP_RETURN, buffer]);
}
exports.encode = encode;
function decode(buffer) {
  typeforce(check, buffer);
  return bscript.decompile(buffer)[1].slice(4, 36);
}
exports.decode = decode;