Use ES2020, add dev dep for randombytes

src/block.js

@@ -14,6 +14,16 @@ const errorWitnessNotSegwit = new TypeError(
   'Cannot compute witness commit for non-segwit block',
 );
 class Block {
+  constructor() {
+    this.version = 1;
+    this.prevHash = undefined;
+    this.merkleRoot = undefined;
+    this.timestamp = 0;
+    this.witnessCommit = undefined;
+    this.bits = 0;
+    this.nonce = 0;
+    this.transactions = undefined;
+  }
   static fromBuffer(buffer) {
     if (buffer.length < 80) throw new Error('Buffer too small (< 80 bytes)');
     const bufferReader = new bufferutils_1.BufferReader(buffer);
@@ -69,14 +79,6 @@ class Block {
         )
       : rootHash;
   }
-  version = 1;
-  prevHash = undefined;
-  merkleRoot = undefined;
-  timestamp = 0;
-  witnessCommit = undefined;
-  bits = 0;
-  nonce = 0;
-  transactions = undefined;
   getWitnessCommit() {
     if (!txesHaveWitnessCommit(this.transactions)) return null;
     // The merkle root for the witness data is in an OP_RETURN output.

src/bufferutils.js

@@ -53,8 +53,6 @@ exports.cloneBuffer = cloneBuffer;
  * Helper class for serialization of bitcoin data types into a pre-allocated buffer.
  */
 class BufferWriter {
-  buffer;
-  offset;
   constructor(buffer, offset = 0) {
     this.buffer = buffer;
     this.offset = offset;
@@ -96,8 +94,6 @@ exports.BufferWriter = BufferWriter;
  * Helper class for reading of bitcoin data types from a buffer.
  */
 class BufferReader {
-  buffer;
-  offset;
   constructor(buffer, offset = 0) {
     this.buffer = buffer;
     this.offset = offset;

src/psbt.js

@@ -60,23 +60,6 @@ const DEFAULT_OPTS = {
  *   Transaction object. Such as fee rate not being larger than maximumFeeRate etc.
  */
 class Psbt {
-  data;
-  static fromBase64(data, opts = {}) {
-    const buffer = Buffer.from(data, 'base64');
-    return this.fromBuffer(buffer, opts);
-  }
-  static fromHex(data, opts = {}) {
-    const buffer = Buffer.from(data, 'hex');
-    return this.fromBuffer(buffer, opts);
-  }
-  static fromBuffer(buffer, opts = {}) {
-    const psbtBase = bip174_1.Psbt.fromBuffer(buffer, transactionFromBuffer);
-    const psbt = new Psbt(opts, psbtBase);
-    checkTxForDupeIns(psbt.__CACHE.__TX, psbt.__CACHE);
-    return psbt;
-  }
-  __CACHE;
-  opts;
   constructor(opts = {}, data = new bip174_1.Psbt(new PsbtTransaction())) {
     this.data = data;
     // set defaults
@@ -106,6 +89,20 @@ class Psbt {
     dpew(this, '__CACHE', false, true);
     dpew(this, 'opts', false, true);
   }
+  static fromBase64(data, opts = {}) {
+    const buffer = Buffer.from(data, 'base64');
+    return this.fromBuffer(buffer, opts);
+  }
+  static fromHex(data, opts = {}) {
+    const buffer = Buffer.from(data, 'hex');
+    return this.fromBuffer(buffer, opts);
+  }
+  static fromBuffer(buffer, opts = {}) {
+    const psbtBase = bip174_1.Psbt.fromBuffer(buffer, transactionFromBuffer);
+    const psbt = new Psbt(opts, psbtBase);
+    checkTxForDupeIns(psbt.__CACHE.__TX, psbt.__CACHE);
+    return psbt;
+  }
   get inputCount() {
     return this.data.inputs.length;
   }
@@ -625,7 +622,6 @@ const transactionFromBuffer = buffer => new PsbtTransaction(buffer);
  * It contains a bitcoinjs-lib Transaction object.
  */
 class PsbtTransaction {
-  tx;
   constructor(buffer = Buffer.from([2, 0, 0, 0, 0, 0, 0, 0, 0, 0])) {
     this.tx = transaction_1.Transaction.fromBuffer(buffer);
     checkTxEmpty(this.tx);

src/transaction.js

@@ -39,13 +39,12 @@ function isOutput(out) {
   return out.value !== undefined;
 }
 class Transaction {
-  static DEFAULT_SEQUENCE = 0xffffffff;
-  static SIGHASH_ALL = 0x01;
-  static SIGHASH_NONE = 0x02;
-  static SIGHASH_SINGLE = 0x03;
-  static SIGHASH_ANYONECANPAY = 0x80;
-  static ADVANCED_TRANSACTION_MARKER = 0x00;
-  static ADVANCED_TRANSACTION_FLAG = 0x01;
+  constructor() {
+    this.version = 1;
+    this.locktime = 0;
+    this.ins = [];
+    this.outs = [];
+  }
   static fromBuffer(buffer, _NO_STRICT) {
     const bufferReader = new bufferutils_1.BufferReader(buffer);
     const tx = new Transaction();
@@ -102,10 +101,6 @@ class Transaction {
     }
     return true;
   }
-  version = 1;
-  locktime = 0;
-  ins = [];
-  outs = [];
   isCoinbase() {
     return (
       this.ins.length === 1 && Transaction.isCoinbaseHash(this.ins[0].hash)
@@ -400,3 +395,10 @@ class Transaction {
   }
 }
 exports.Transaction = Transaction;
+Transaction.DEFAULT_SEQUENCE = 0xffffffff;
+Transaction.SIGHASH_ALL = 0x01;
+Transaction.SIGHASH_NONE = 0x02;
+Transaction.SIGHASH_SINGLE = 0x03;
+Transaction.SIGHASH_ANYONECANPAY = 0x80;
+Transaction.ADVANCED_TRANSACTION_MARKER = 0x00;
+Transaction.ADVANCED_TRANSACTION_FLAG = 0x01;