@bbachain/web3.js/lib/index.browser.esm.js

BBAChain Javascript API

import { Buffer } from 'buffer';
import { ed25519 } from '@noble/curves/ed25519';
import BN from 'bn.js';
import bs58 from 'bs58';
import { sha256 } from '@noble/hashes/sha256';
import { serialize, deserialize, deserializeUnchecked } from 'borsh';
import * as BufferLayout from '@bbachain/buffer-layout';
import { blob } from '@bbachain/buffer-layout';
import { toBigIntLE, toBufferLE } from 'bigint-buffer';
import { coerce, instance, string, tuple, literal, unknown, type, number, array, nullable, optional, boolean, record, union, create, any, assert as assert$1 } from 'superstruct';
import RpcClient from 'jayson/lib/client/browser';
import RpcWebSocketCommonClient from 'rpc-websockets/dist/lib/client';
import createRpc from 'rpc-websockets/dist/lib/client/websocket.browser';
import { keccak_256 } from '@noble/hashes/sha3';
import { secp256k1 } from '@noble/curves/secp256k1';

/**
 * A 64 byte secret key, the first 32 bytes of which is the
 * private scalar and the last 32 bytes is the public key.
 * Read more: https://blog.mozilla.org/warner/2011/11/29/ed25519-keys/
 */

const generatePrivateKey = ed25519.utils.randomPrivateKey;
const generateKeypair = () => {
  const privateScalar = ed25519.utils.randomPrivateKey();
  const publicKey = getPublicKey(privateScalar);
  const secretKey = new Uint8Array(64);
  secretKey.set(privateScalar);
  secretKey.set(publicKey, 32);
  return {
    publicKey,
    secretKey
  };
};
const getPublicKey = ed25519.getPublicKey;
function isOnCurve(publicKey) {
  try {
    ed25519.ExtendedPoint.fromHex(publicKey);
    return true;
  } catch {
    return false;
  }
}
const sign = (message, secretKey) => ed25519.sign(message, secretKey.slice(0, 32));
const verify = ed25519.verify;

const toBuffer = arr => {
  if (Buffer.isBuffer(arr)) {
    return arr;
  } else if (arr instanceof Uint8Array) {
    return Buffer.from(arr.buffer, arr.byteOffset, arr.byteLength);
  } else {
    return Buffer.from(arr);
  }
};

class Struct {
  constructor(properties) {
    Object.assign(this, properties);
  }

  encode() {
    return Buffer.from(serialize(BBACHAIN_SCHEMA, this));
  }

  static decode(data) {
    return deserialize(BBACHAIN_SCHEMA, this, data);
  }

  static decodeUnchecked(data) {
    return deserializeUnchecked(BBACHAIN_SCHEMA, this, data);
  }

} // Class representing a Rust-compatible enum, since enums are only strings or
// numbers in pure JS

class Enum extends Struct {
  constructor(properties) {
    super(properties);
    this.enum = '';

    if (Object.keys(properties).length !== 1) {
      throw new Error('Enum can only take single value');
    }

    Object.keys(properties).map(key => {
      this.enum = key;
    });
  }

}
const BBACHAIN_SCHEMA = new Map();

let _Symbol$toStringTag;
/**
 * Maximum length of derived pubkey seed
 */

const MAX_SEED_LENGTH = 32;
/**
 * Size of public key in bytes
 */

const PUBLIC_KEY_LENGTH = 32;
/**
 * Value to be converted into public key
 */

function isPublicKeyData(value) {
  return value._bn !== undefined;
} // local counter used by PublicKey.unique()


let uniquePublicKeyCounter = 1;
/**
 * A public key
 */

_Symbol$toStringTag = Symbol.toStringTag;
class PublicKey extends Struct {
  /** @internal */

  /**
   * Create a new PublicKey object
   * @param value ed25519 public key as buffer or base-58 encoded string
   */
  constructor(value) {
    super({});
    this._bn = void 0;

    if (isPublicKeyData(value)) {
      this._bn = value._bn;
    } else {
      if (typeof value === 'string') {
        // assume base 58 encoding by default
        const decoded = bs58.decode(value);

        if (decoded.length != PUBLIC_KEY_LENGTH) {
          throw new Error(`Invalid public key input`);
        }

        this._bn = new BN(decoded);
      } else {
        this._bn = new BN(value);
      }

      if (this._bn.byteLength() > PUBLIC_KEY_LENGTH) {
        throw new Error(`Invalid public key input`);
      }
    }
  }
  /**
   * Returns a unique PublicKey for tests and benchmarks using a counter
   */


  static unique() {
    const key = new PublicKey(uniquePublicKeyCounter);
    uniquePublicKeyCounter += 1;
    return new PublicKey(key.toBuffer());
  }
  /**
   * Default public key value. The base58-encoded string representation is all ones (as seen below)
   * The underlying BN number is 32 bytes that are all zeros
   */


  /**
   * Checks if two publicKeys are equal
   */
  equals(publicKey) {
    return this._bn.eq(publicKey._bn);
  }
  /**
   * Return the base-58 representation of the public key
   */


  toBase58() {
    return bs58.encode(this.toBytes());
  }

  toJSON() {
    return this.toBase58();
  }
  /**
   * Return the byte array representation of the public key in big endian
   */


  toBytes() {
    const buf = this.toBuffer();
    return new Uint8Array(buf.buffer, buf.byteOffset, buf.byteLength);
  }
  /**
   * Return the Buffer representation of the public key in big endian
   */


  toBuffer() {
    const b = this._bn.toArrayLike(Buffer);

    if (b.length === PUBLIC_KEY_LENGTH) {
      return b;
    }

    const zeroPad = Buffer.alloc(32);
    b.copy(zeroPad, 32 - b.length);
    return zeroPad;
  }

  get [_Symbol$toStringTag]() {
    return `PublicKey(${this.toString()})`;
  }
  /**
   * Return the base-58 representation of the public key
   */


  toString() {
    return this.toBase58();
  }
  /**
   * Derive a public key from another key, a seed, and a program ID.
   * The program ID will also serve as the owner of the public key, giving
   * it permission to write data to the account.
   */

  /* eslint-disable require-await */


  static async createWithSeed(fromPublicKey, seed, programId) {
    const buffer = Buffer.concat([fromPublicKey.toBuffer(), Buffer.from(seed), programId.toBuffer()]);
    const publicKeyBytes = sha256(buffer);
    return new PublicKey(publicKeyBytes);
  }
  /**
   * Derive a program address from seeds and a program ID.
   */

  /* eslint-disable require-await */


  static createProgramAddressSync(seeds, programId) {
    let buffer = Buffer.alloc(0);
    seeds.forEach(function (seed) {
      if (seed.length > MAX_SEED_LENGTH) {
        throw new TypeError(`Max seed length exceeded`);
      }

      buffer = Buffer.concat([buffer, toBuffer(seed)]);
    });
    buffer = Buffer.concat([buffer, programId.toBuffer(), Buffer.from('ProgramDerivedAddress')]);
    const publicKeyBytes = sha256(buffer);

    if (isOnCurve(publicKeyBytes)) {
      throw new Error(`Invalid seeds, address must fall off the curve`);
    }

    return new PublicKey(publicKeyBytes);
  }
  /**
   * Async version of createProgramAddressSync
   * For backwards compatibility
   *
   * @deprecated Use {@link createProgramAddressSync} instead
   */

  /* eslint-disable require-await */


  static async createProgramAddress(seeds, programId) {
    return this.createProgramAddressSync(seeds, programId);
  }
  /**
   * Find a valid program address
   *
   * Valid program addresses must fall off the ed25519 curve.  This function
   * iterates a nonce until it finds one that when combined with the seeds
   * results in a valid program address.
   */


  static findProgramAddressSync(seeds, programId) {
    let nonce = 255;
    let address;

    while (nonce != 0) {
      try {
        const seedsWithNonce = seeds.concat(Buffer.from([nonce]));
        address = this.createProgramAddressSync(seedsWithNonce, programId);
      } catch (err) {
        if (err instanceof TypeError) {
          throw err;
        }

        nonce--;
        continue;
      }

      return [address, nonce];
    }

    throw new Error(`Unable to find a viable program address nonce`);
  }
  /**
   * Async version of findProgramAddressSync
   * For backwards compatibility
   *
   * @deprecated Use {@link findProgramAddressSync} instead
   */


  static async findProgramAddress(seeds, programId) {
    return this.findProgramAddressSync(seeds, programId);
  }
  /**
   * Check that a pubkey is on the ed25519 curve.
   */


  static isOnCurve(pubkeyData) {
    const pubkey = new PublicKey(pubkeyData);
    return isOnCurve(pubkey.toBytes());
  }

}
PublicKey.default = new PublicKey('11111111111111111111111111111111');
BBACHAIN_SCHEMA.set(PublicKey, {
  kind: 'struct',
  fields: [['_bn', 'u256']]
});

/**
 * An account key pair (public and secret keys).
 *
 * @deprecated since v1.10.0, please use {@link Keypair} instead.
 */

class Account {
  /** @internal */

  /** @internal */

  /**
   * Create a new Account object
   *
   * If the secretKey parameter is not provided a new key pair is randomly
   * created for the account
   *
   * @param secretKey Secret key for the account
   */
  constructor(secretKey) {
    this._publicKey = void 0;
    this._secretKey = void 0;

    if (secretKey) {
      const secretKeyBuffer = toBuffer(secretKey);

      if (secretKey.length !== 64) {
        throw new Error('bad secret key size');
      }

      this._publicKey = secretKeyBuffer.slice(32, 64);
      this._secretKey = secretKeyBuffer.slice(0, 32);
    } else {
      this._secretKey = toBuffer(generatePrivateKey());
      this._publicKey = toBuffer(getPublicKey(this._secretKey));
    }
  }
  /**
   * The public key for this account
   */


  get publicKey() {
    return new PublicKey(this._publicKey);
  }
  /**
   * The **unencrypted** secret key for this account. The first 32 bytes
   * is the private scalar and the last 32 bytes is the public key.
   * Read more: https://blog.mozilla.org/warner/2011/11/29/ed25519-keys/
   */


  get secretKey() {
    return Buffer.concat([this._secretKey, this._publicKey], 64);
  }

}

const BPF_LOADER_DEPRECATED_PROGRAM_ID = new PublicKey('BPFLoader1111111111111111111111111111111111');

/**
 * Maximum over-the-wire size of a Transaction
 *
 * 1280 is IPv6 minimum MTU
 * 40 bytes is the size of the IPv6 header
 * 8 bytes is the size of the fragment header
 */
const PACKET_DATA_SIZE = 1280 - 40 - 8;
const VERSION_PREFIX_MASK = 0x7f;
const SIGNATURE_LENGTH_IN_BYTES = 64;

class TransactionExpiredBlockheightExceededError extends Error {
  constructor(signature) {
    super(`Signature ${signature} has expired: block height exceeded.`);
    this.signature = void 0;
    this.signature = signature;
  }

}
Object.defineProperty(TransactionExpiredBlockheightExceededError.prototype, 'name', {
  value: 'TransactionExpiredBlockheightExceededError'
});
class TransactionExpiredTimeoutError extends Error {
  constructor(signature, timeoutSeconds) {
    super(`Transaction was not confirmed in ${timeoutSeconds.toFixed(2)} seconds. It is ` + 'unknown if it succeeded or failed. Check signature ' + `${signature} using the BBAChain Explorer or CLI tools.`);
    this.signature = void 0;
    this.signature = signature;
  }

}
Object.defineProperty(TransactionExpiredTimeoutError.prototype, 'name', {
  value: 'TransactionExpiredTimeoutError'
});
class TransactionExpiredNonceInvalidError extends Error {
  constructor(signature) {
    super(`Signature ${signature} has expired: the nonce is no longer valid.`);
    this.signature = void 0;
    this.signature = signature;
  }

}
Object.defineProperty(TransactionExpiredNonceInvalidError.prototype, 'name', {
  value: 'TransactionExpiredNonceInvalidError'
});

class MessageAccountKeys {
  constructor(staticAccountKeys, accountKeysFromLookups) {
    this.staticAccountKeys = void 0;
    this.accountKeysFromLookups = void 0;
    this.staticAccountKeys = staticAccountKeys;
    this.accountKeysFromLookups = accountKeysFromLookups;
  }

  keySegments() {
    const keySegments = [this.staticAccountKeys];

    if (this.accountKeysFromLookups) {
      keySegments.push(this.accountKeysFromLookups.writable);
      keySegments.push(this.accountKeysFromLookups.readonly);
    }

    return keySegments;
  }

  get(index) {
    for (const keySegment of this.keySegments()) {
      if (index < keySegment.length) {
        return keySegment[index];
      } else {
        index -= keySegment.length;
      }
    }

    return;
  }

  get length() {
    return this.keySegments().flat().length;
  }

  compileInstructions(instructions) {
    // Bail early if any account indexes would overflow a u8
    const U8_MAX = 255;

    if (this.length > U8_MAX + 1) {
      throw new Error('Account index overflow encountered during compilation');
    }

    const keyIndexMap = new Map();
    this.keySegments().flat().forEach((key, index) => {
      keyIndexMap.set(key.toBase58(), index);
    });

    const findKeyIndex = key => {
      const keyIndex = keyIndexMap.get(key.toBase58());
      if (keyIndex === undefined) throw new Error('Encountered an unknown instruction account key during compilation');
      return keyIndex;
    };

    return instructions.map(instruction => {
      return {
        programIdIndex: findKeyIndex(instruction.programId),
        accountKeyIndexes: instruction.keys.map(meta => findKeyIndex(meta.pubkey)),
        data: instruction.data
      };
    });
  }

}

/**
 * Layout for a public key
 */
const publicKey = (property = 'publicKey') => {
  return BufferLayout.blob(32, property);
};
/**
 * Layout for a signature
 */

const signature = (property = 'signature') => {
  return BufferLayout.blob(64, property);
};

/**
 * Layout for a Rust String type
 */
const rustString = (property = 'string') => {
  const rsl = BufferLayout.struct([BufferLayout.u32('length'), BufferLayout.u32('lengthPadding'), BufferLayout.blob(BufferLayout.offset(BufferLayout.u32(), -8), 'chars')], property);

  const _decode = rsl.decode.bind(rsl);

  const _encode = rsl.encode.bind(rsl);

  const rslShim = rsl;

  rslShim.decode = (b, offset) => {
    const data = _decode(b, offset);

    return data['chars'].toString();
  };

  rslShim.encode = (str, b, offset) => {
    const data = {
      chars: Buffer.from(str, 'utf8')
    };
    return _encode(data, b, offset);
  };

  rslShim.alloc = str => {
    return BufferLayout.u32().span + BufferLayout.u32().span + Buffer.from(str, 'utf8').length;
  };

  return rslShim;
};
/**
 * Layout for an Authorized object
 */

const authorized = (property = 'authorized') => {
  return BufferLayout.struct([publicKey('staker'), publicKey('withdrawer')], property);
};
/**
 * Layout for a Lockup object
 */

const lockup = (property = 'lockup') => {
  return BufferLayout.struct([BufferLayout.ns64('unixTimestamp'), BufferLayout.ns64('epoch'), publicKey('custodian')], property);
};
/**
 *  Layout for a VoteInit object
 */

const voteInit = (property = 'voteInit') => {
  return BufferLayout.struct([publicKey('nodePubkey'), publicKey('authorizedVoter'), publicKey('authorizedWithdrawer'), BufferLayout.u8('commission')], property);
};
/**
 *  Layout for a VoteAuthorizeWithSeedArgs object
 */

const voteAuthorizeWithSeedArgs = (property = 'voteAuthorizeWithSeedArgs') => {
  return BufferLayout.struct([BufferLayout.u32('voteAuthorizationType'), publicKey('currentAuthorityDerivedKeyOwnerPubkey'), rustString('currentAuthorityDerivedKeySeed'), publicKey('newAuthorized')], property);
};
function getAlloc(type, fields) {
  const getItemAlloc = item => {
    if (item.span >= 0) {
      return item.span;
    } else if (typeof item.alloc === 'function') {
      return item.alloc(fields[item.property]);
    } else if ('count' in item && 'elementLayout' in item) {
      const field = fields[item.property];

      if (Array.isArray(field)) {
        return field.length * getItemAlloc(item.elementLayout);
      }
    } else if ('fields' in item) {
      // This is a `Structure` whose size needs to be recursively measured.
      return getAlloc({
        layout: item
      }, fields[item.property]);
    } // Couldn't determine allocated size of layout


    return 0;
  };

  let alloc = 0;
  type.layout.fields.forEach(item => {
    alloc += getItemAlloc(item);
  });
  return alloc;
}

function decodeLength(bytes) {
  let len = 0;
  let size = 0;

  for (;;) {
    let elem = bytes.shift();
    len |= (elem & 0x7f) << size * 7;
    size += 1;

    if ((elem & 0x80) === 0) {
      break;
    }
  }

  return len;
}
function encodeLength(bytes, len) {
  let rem_len = len;

  for (;;) {
    let elem = rem_len & 0x7f;
    rem_len >>= 7;

    if (rem_len == 0) {
      bytes.push(elem);
      break;
    } else {
      elem |= 0x80;
      bytes.push(elem);
    }
  }
}

function assert (condition, message) {
  if (!condition) {
    throw new Error(message || 'Assertion failed');
  }
}

class CompiledKeys {
  constructor(payer, keyMetaMap) {
    this.payer = void 0;
    this.keyMetaMap = void 0;
    this.payer = payer;
    this.keyMetaMap = keyMetaMap;
  }

  static compile(instructions, payer) {
    const keyMetaMap = new Map();

    const getOrInsertDefault = pubkey => {
      const address = pubkey.toBase58();
      let keyMeta = keyMetaMap.get(address);

      if (keyMeta === undefined) {
        keyMeta = {
          isSigner: false,
          isWritable: false,
          isInvoked: false
        };
        keyMetaMap.set(address, keyMeta);
      }

      return keyMeta;
    };

    const payerKeyMeta = getOrInsertDefault(payer);
    payerKeyMeta.isSigner = true;
    payerKeyMeta.isWritable = true;

    for (const ix of instructions) {
      getOrInsertDefault(ix.programId).isInvoked = true;

      for (const accountMeta of ix.keys) {
        const keyMeta = getOrInsertDefault(accountMeta.pubkey);
        keyMeta.isSigner ||= accountMeta.isSigner;
        keyMeta.isWritable ||= accountMeta.isWritable;
      }
    }

    return new CompiledKeys(payer, keyMetaMap);
  }

  getMessageComponents() {
    const mapEntries = [...this.keyMetaMap.entries()];
    assert(mapEntries.length <= 256, 'Max static account keys length exceeded');
    const writableSigners = mapEntries.filter(([, meta]) => meta.isSigner && meta.isWritable);
    const readonlySigners = mapEntries.filter(([, meta]) => meta.isSigner && !meta.isWritable);
    const writableNonSigners = mapEntries.filter(([, meta]) => !meta.isSigner && meta.isWritable);
    const readonlyNonSigners = mapEntries.filter(([, meta]) => !meta.isSigner && !meta.isWritable);
    const header = {
      numRequiredSignatures: writableSigners.length + readonlySigners.length,
      numReadonlySignedAccounts: readonlySigners.length,
      numReadonlyUnsignedAccounts: readonlyNonSigners.length
    }; // sanity checks

    {
      assert(writableSigners.length > 0, 'Expected at least one writable signer key');
      const [payerAddress] = writableSigners[0];
      assert(payerAddress === this.payer.toBase58(), 'Expected first writable signer key to be the fee payer');
    }
    const staticAccountKeys = [...writableSigners.map(([address]) => new PublicKey(address)), ...readonlySigners.map(([address]) => new PublicKey(address)), ...writableNonSigners.map(([address]) => new PublicKey(address)), ...readonlyNonSigners.map(([address]) => new PublicKey(address))];
    return [header, staticAccountKeys];
  }

  extractTableLookup(lookupTable) {
    const [writableIndexes, drainedWritableKeys] = this.drainKeysFoundInLookupTable(lookupTable.state.addresses, keyMeta => !keyMeta.isSigner && !keyMeta.isInvoked && keyMeta.isWritable);
    const [readonlyIndexes, drainedReadonlyKeys] = this.drainKeysFoundInLookupTable(lookupTable.state.addresses, keyMeta => !keyMeta.isSigner && !keyMeta.isInvoked && !keyMeta.isWritable); // Don't extract lookup if no keys were found

    if (writableIndexes.length === 0 && readonlyIndexes.length === 0) {
      return;
    }

    return [{
      accountKey: lookupTable.key,
      writableIndexes,
      readonlyIndexes
    }, {
      writable: drainedWritableKeys,
      readonly: drainedReadonlyKeys
    }];
  }
  /** @internal */


  drainKeysFoundInLookupTable(lookupTableEntries, keyMetaFilter) {
    const lookupTableIndexes = new Array();
    const drainedKeys = new Array();

    for (const [address, keyMeta] of this.keyMetaMap.entries()) {
      if (keyMetaFilter(keyMeta)) {
        const key = new PublicKey(address);
        const lookupTableIndex = lookupTableEntries.findIndex(entry => entry.equals(key));

        if (lookupTableIndex >= 0) {
          assert(lookupTableIndex < 256, 'Max lookup table index exceeded');
          lookupTableIndexes.push(lookupTableIndex);
          drainedKeys.push(key);
          this.keyMetaMap.delete(address);
        }
      }
    }

    return [lookupTableIndexes, drainedKeys];
  }

}

/**
 * An instruction to execute by a program
 *
 * @property {number} programIdIndex
 * @property {number[]} accounts
 * @property {string} data
 */

/**
 * List of instructions to be processed atomically
 */
class Message {
  constructor(args) {
    this.header = void 0;
    this.accountKeys = void 0;
    this.recentBlockhash = void 0;
    this.instructions = void 0;
    this.indexToProgramIds = new Map();
    this.header = args.header;
    this.accountKeys = args.accountKeys.map(account => new PublicKey(account));
    this.recentBlockhash = args.recentBlockhash;
    this.instructions = args.instructions;
    this.instructions.forEach(ix => this.indexToProgramIds.set(ix.programIdIndex, this.accountKeys[ix.programIdIndex]));
  }

  get version() {
    return 'legacy';
  }

  get staticAccountKeys() {
    return this.accountKeys;
  }

  get compiledInstructions() {
    return this.instructions.map(ix => ({
      programIdIndex: ix.programIdIndex,
      accountKeyIndexes: ix.accounts,
      data: bs58.decode(ix.data)
    }));
  }

  get addressTableLookups() {
    return [];
  }

  getAccountKeys() {
    return new MessageAccountKeys(this.staticAccountKeys);
  }

  static compile(args) {
    const compiledKeys = CompiledKeys.compile(args.instructions, args.payerKey);
    const [header, staticAccountKeys] = compiledKeys.getMessageComponents();
    const accountKeys = new MessageAccountKeys(staticAccountKeys);
    const instructions = accountKeys.compileInstructions(args.instructions).map(ix => ({
      programIdIndex: ix.programIdIndex,
      accounts: ix.accountKeyIndexes,
      data: bs58.encode(ix.data)
    }));
    return new Message({
      header,
      accountKeys: staticAccountKeys,
      recentBlockhash: args.recentBlockhash,
      instructions
    });
  }

  isAccountSigner(index) {
    return index < this.header.numRequiredSignatures;
  }

  isAccountWritable(index) {
    const numSignedAccounts = this.header.numRequiredSignatures;

    if (index >= this.header.numRequiredSignatures) {
      const unsignedAccountIndex = index - numSignedAccounts;
      const numUnsignedAccounts = this.accountKeys.length - numSignedAccounts;
      const numWritableUnsignedAccounts = numUnsignedAccounts - this.header.numReadonlyUnsignedAccounts;
      return unsignedAccountIndex < numWritableUnsignedAccounts;
    } else {
      const numWritableSignedAccounts = numSignedAccounts - this.header.numReadonlySignedAccounts;
      return index < numWritableSignedAccounts;
    }
  }

  isProgramId(index) {
    return this.indexToProgramIds.has(index);
  }

  programIds() {
    return [...this.indexToProgramIds.values()];
  }

  nonProgramIds() {
    return this.accountKeys.filter((_, index) => !this.isProgramId(index));
  }

  serialize() {
    const numKeys = this.accountKeys.length;
    let keyCount = [];
    encodeLength(keyCount, numKeys);
    const instructions = this.instructions.map(instruction => {
      const {
        accounts,
        programIdIndex
      } = instruction;
      const data = Array.from(bs58.decode(instruction.data));
      let keyIndicesCount = [];
      encodeLength(keyIndicesCount, accounts.length);
      let dataCount = [];
      encodeLength(dataCount, data.length);
      return {
        programIdIndex,
        keyIndicesCount: Buffer.from(keyIndicesCount),
        keyIndices: accounts,
        dataLength: Buffer.from(dataCount),
        data
      };
    });
    let instructionCount = [];
    encodeLength(instructionCount, instructions.length);
    let instructionBuffer = Buffer.alloc(PACKET_DATA_SIZE);
    Buffer.from(instructionCount).copy(instructionBuffer);
    let instructionBufferLength = instructionCount.length;
    instructions.forEach(instruction => {
      const instructionLayout = BufferLayout.struct([BufferLayout.u8('programIdIndex'), BufferLayout.blob(instruction.keyIndicesCount.length, 'keyIndicesCount'), BufferLayout.seq(BufferLayout.u8('keyIndex'), instruction.keyIndices.length, 'keyIndices'), BufferLayout.blob(instruction.dataLength.length, 'dataLength'), BufferLayout.seq(BufferLayout.u8('userdatum'), instruction.data.length, 'data')]);
      const length = instructionLayout.encode(instruction, instructionBuffer, instructionBufferLength);
      instructionBufferLength += length;
    });
    instructionBuffer = instructionBuffer.slice(0, instructionBufferLength);
    const signDataLayout = BufferLayout.struct([BufferLayout.blob(1, 'numRequiredSignatures'), BufferLayout.blob(1, 'numReadonlySignedAccounts'), BufferLayout.blob(1, 'numReadonlyUnsignedAccounts'), BufferLayout.blob(keyCount.length, 'keyCount'), BufferLayout.seq(publicKey('key'), numKeys, 'keys'), publicKey('recentBlockhash')]);
    const transaction = {
      numRequiredSignatures: Buffer.from([this.header.numRequiredSignatures]),
      numReadonlySignedAccounts: Buffer.from([this.header.numReadonlySignedAccounts]),
      numReadonlyUnsignedAccounts: Buffer.from([this.header.numReadonlyUnsignedAccounts]),
      keyCount: Buffer.from(keyCount),
      keys: this.accountKeys.map(key => toBuffer(key.toBytes())),
      recentBlockhash: bs58.decode(this.recentBlockhash)
    };
    let signData = Buffer.alloc(2048);
    const length = signDataLayout.encode(transaction, signData);
    instructionBuffer.copy(signData, length);
    return signData.slice(0, length + instructionBuffer.length);
  }
  /**
   * Decode a compiled message into a Message object.
   */


  static from(buffer) {
    // Slice up wire data
    let byteArray = [...buffer];
    const numRequiredSignatures = byteArray.shift();

    if (numRequiredSignatures !== (numRequiredSignatures & VERSION_PREFIX_MASK)) {
      throw new Error('Versioned messages must be deserialized with VersionedMessage.deserialize()');
    }

    const numReadonlySignedAccounts = byteArray.shift();
    const numReadonlyUnsignedAccounts = byteArray.shift();
    const accountCount = decodeLength(byteArray);
    let accountKeys = [];

    for (let i = 0; i < accountCount; i++) {
      const account = byteArray.slice(0, PUBLIC_KEY_LENGTH);
      byteArray = byteArray.slice(PUBLIC_KEY_LENGTH);
      accountKeys.push(new PublicKey(Buffer.from(account)));
    }

    const recentBlockhash = byteArray.slice(0, PUBLIC_KEY_LENGTH);
    byteArray = byteArray.slice(PUBLIC_KEY_LENGTH);
    const instructionCount = decodeLength(byteArray);
    let instructions = [];

    for (let i = 0; i < instructionCount; i++) {
      const programIdIndex = byteArray.shift();
      const accountCount = decodeLength(byteArray);
      const accounts = byteArray.slice(0, accountCount);
      byteArray = byteArray.slice(accountCount);
      const dataLength = decodeLength(byteArray);
      const dataSlice = byteArray.slice(0, dataLength);
      const data = bs58.encode(Buffer.from(dataSlice));
      byteArray = byteArray.slice(dataLength);
      instructions.push({
        programIdIndex,
        accounts,
        data
      });
    }

    const messageArgs = {
      header: {
        numRequiredSignatures,
        numReadonlySignedAccounts,
        numReadonlyUnsignedAccounts
      },
      recentBlockhash: bs58.encode(Buffer.from(recentBlockhash)),
      accountKeys,
      instructions
    };
    return new Message(messageArgs);
  }

}

/**
 * Message constructor arguments
 */

class MessageV0 {
  constructor(args) {
    this.header = void 0;
    this.staticAccountKeys = void 0;
    this.recentBlockhash = void 0;
    this.compiledInstructions = void 0;
    this.addressTableLookups = void 0;
    this.header = args.header;
    this.staticAccountKeys = args.staticAccountKeys;
    this.recentBlockhash = args.recentBlockhash;
    this.compiledInstructions = args.compiledInstructions;
    this.addressTableLookups = args.addressTableLookups;
  }

  get version() {
    return 0;
  }

  get numAccountKeysFromLookups() {
    let count = 0;

    for (const lookup of this.addressTableLookups) {
      count += lookup.readonlyIndexes.length + lookup.writableIndexes.length;
    }

    return count;
  }

  getAccountKeys(args) {
    let accountKeysFromLookups;

    if (args && 'accountKeysFromLookups' in args && args.accountKeysFromLookups) {
      if (this.numAccountKeysFromLookups != args.accountKeysFromLookups.writable.length + args.accountKeysFromLookups.readonly.length) {
        throw new Error('Failed to get account keys because of a mismatch in the number of account keys from lookups');
      }

      accountKeysFromLookups = args.accountKeysFromLookups;
    } else if (args && 'addressLookupTableAccounts' in args && args.addressLookupTableAccounts) {
      accountKeysFromLookups = this.resolveAddressTableLookups(args.addressLookupTableAccounts);
    } else if (this.addressTableLookups.length > 0) {
      throw new Error('Failed to get account keys because address table lookups were not resolved');
    }

    return new MessageAccountKeys(this.staticAccountKeys, accountKeysFromLookups);
  }

  isAccountSigner(index) {
    return index < this.header.numRequiredSignatures;
  }

  isAccountWritable(index) {
    const numSignedAccounts = this.header.numRequiredSignatures;
    const numStaticAccountKeys = this.staticAccountKeys.length;

    if (index >= numStaticAccountKeys) {
      const lookupAccountKeysIndex = index - numStaticAccountKeys;
      const numWritableLookupAccountKeys = this.addressTableLookups.reduce((count, lookup) => count + lookup.writableIndexes.length, 0);
      return lookupAccountKeysIndex < numWritableLookupAccountKeys;
    } else if (index >= this.header.numRequiredSignatures) {
      const unsignedAccountIndex = index - numSignedAccounts;
      const numUnsignedAccounts = numStaticAccountKeys - numSignedAccounts;
      const numWritableUnsignedAccounts = numUnsignedAccounts - this.header.numReadonlyUnsignedAccounts;
      return unsignedAccountIndex < numWritableUnsignedAccounts;
    } else {
      const numWritableSignedAccounts = numSignedAccounts - this.header.numReadonlySignedAccounts;
      return index < numWritableSignedAccounts;
    }
  }

  resolveAddressTableLookups(addressLookupTableAccounts) {
    const accountKeysFromLookups = {
      writable: [],
      readonly: []
    };

    for (const tableLookup of this.addressTableLookups) {
      const tableAccount = addressLookupTableAccounts.find(account => account.key.equals(tableLookup.accountKey));

      if (!tableAccount) {
        throw new Error(`Failed to find address lookup table account for table key ${tableLookup.accountKey.toBase58()}`);
      }

      for (const index of tableLookup.writableIndexes) {
        if (index < tableAccount.state.addresses.length) {
          accountKeysFromLookups.writable.push(tableAccount.state.addresses[index]);
        } else {
          throw new Error(`Failed to find address for index ${index} in address lookup table ${tableLookup.accountKey.toBase58()}`);
        }
      }

      for (const index of tableLookup.readonlyIndexes) {
        if (index < tableAccount.state.addresses.length) {
          accountKeysFromLookups.readonly.push(tableAccount.state.addresses[index]);
        } else {
          throw new Error(`Failed to find address for index ${index} in address lookup table ${tableLookup.accountKey.toBase58()}`);
        }
      }
    }

    return accountKeysFromLookups;
  }

  static compile(args) {
    const compiledKeys = CompiledKeys.compile(args.instructions, args.payerKey);
    const addressTableLookups = new Array();
    const accountKeysFromLookups = {
      writable: new Array(),
      readonly: new Array()
    };
    const lookupTableAccounts = args.addressLookupTableAccounts || [];

    for (const lookupTable of lookupTableAccounts) {
      const extractResult = compiledKeys.extractTableLookup(lookupTable);

      if (extractResult !== undefined) {
        const [addressTableLookup, {
          writable,
          readonly
        }] = extractResult;
        addressTableLookups.push(addressTableLookup);
        accountKeysFromLookups.writable.push(...writable);
        accountKeysFromLookups.readonly.push(...readonly);
      }
    }

    const [header, staticAccountKeys] = compiledKeys.getMessageComponents();
    const accountKeys = new MessageAccountKeys(staticAccountKeys, accountKeysFromLookups);
    const compiledInstructions = accountKeys.compileInstructions(args.instructions);
    return new MessageV0({
      header,
      staticAccountKeys,
      recentBlockhash: args.recentBlockhash,
      compiledInstructions,
      addressTableLookups
    });
  }

  serialize() {
    const encodedStaticAccountKeysLength = Array();
    encodeLength(encodedStaticAccountKeysLength, this.staticAccountKeys.length);
    const serializedInstructions = this.serializeInstructions();
    const encodedInstructionsLength = Array();
    encodeLength(encodedInstructionsLength, this.compiledInstructions.length);
    const serializedAddressTableLookups = this.serializeAddressTableLookups();
    const encodedAddressTableLookupsLength = Array();
    encodeLength(encodedAddressTableLookupsLength, this.addressTableLookups.length);
    const messageLayout = BufferLayout.struct([BufferLayout.u8('prefix'), BufferLayout.struct([BufferLayout.u8('numRequiredSignatures'), BufferLayout.u8('numReadonlySignedAccounts'), BufferLayout.u8('numReadonlyUnsignedAccounts')], 'header'), BufferLayout.blob(encodedStaticAccountKeysLength.length, 'staticAccountKeysLength'), BufferLayout.seq(publicKey(), this.staticAccountKeys.length, 'staticAccountKeys'), publicKey('recentBlockhash'), BufferLayout.blob(encodedInstructionsLength.length, 'instructionsLength'), BufferLayout.blob(serializedInstructions.length, 'serializedInstructions'), BufferLayout.blob(encodedAddressTableLookupsLength.length, 'addressTableLookupsLength'), BufferLayout.blob(serializedAddressTableLookups.length, 'serializedAddressTableLookups')]);
    const serializedMessage = new Uint8Array(PACKET_DATA_SIZE);
    const MESSAGE_VERSION_0_PREFIX = 1 << 7;
    const serializedMessageLength = messageLayout.encode({
      prefix: MESSAGE_VERSION_0_PREFIX,
      header: this.header,
      staticAccountKeysLength: new Uint8Array(encodedStaticAccountKeysLength),
      staticAccountKeys: this.staticAccountKeys.map(key => key.toBytes()),
      recentBlockhash: bs58.decode(this.recentBlockhash),
      instructionsLength: new Uint8Array(encodedInstructionsLength),
      serializedInstructions,
      addressTableLookupsLength: new Uint8Array(encodedAddressTableLookupsLength),
      serializedAddressTableLookups
    }, serializedMessage);
    return serializedMessage.slice(0, serializedMessageLength);
  }

  serializeInstructions() {
    let serializedLength = 0;
    const serializedInstructions = new Uint8Array(PACKET_DATA_SIZE);

    for (const instruction of this.compiledInstructions) {
      const encodedAccountKeyIndexesLength = Array();
      encodeLength(encodedAccountKeyIndexesLength, instruction.accountKeyIndexes.length);
      const encodedDataLength = Array();
      encodeLength(encodedDataLength, instruction.data.length);
      const instructionLayout = BufferLayout.struct([BufferLayout.u8('programIdIndex'), BufferLayout.blob(encodedAccountKeyIndexesLength.length, 'encodedAccountKeyIndexesLength'), BufferLayout.seq(BufferLayout.u8(), instruction.accountKeyIndexes.length, 'accountKeyIndexes'), BufferLayout.blob(encodedDataLength.length, 'encodedDataLength'), BufferLayout.blob(instruction.data.length, 'data')]);
      serializedLength += instructionLayout.encode({
        programIdIndex: instruction.programIdIndex,
        encodedAccountKeyIndexesLength: new Uint8Array(encodedAccountKeyIndexesLength),
        accountKeyIndexes: instruction.accountKeyIndexes,
        encodedDataLength: new Uint8Array(encodedDataLength),
        data: instruction.data
      }, serializedInstructions, serializedLength);
    }

    return serializedInstructions.slice(0, serializedLength);
  }

  serializeAddressTableLookups() {
    let serializedLength = 0;
    const serializedAddressTableLookups = new Uint8Array(PACKET_DATA_SIZE);

    for (const lookup of this.addressTableLookups) {
      const encodedWritableIndexesLength = Array();
      encodeLength(encodedWritableIndexesLength, lookup.writableIndexes.length);
      const encodedReadonlyIndexesLength = Array();
      encodeLength(encodedReadonlyIndexesLength, lookup.readonlyIndexes.length);
      const addressTableLookupLayout = BufferLayout.struct([publicKey('accountKey'), BufferLayout.blob(encodedWritableIndexesLength.length, 'encodedWritableIndexesLength'), BufferLayout.seq(BufferLayout.u8(), lookup.writableIndexes.length, 'writableIndexes'), BufferLayout.blob(encodedReadonlyIndexesLength.length, 'encodedReadonlyIndexesLength'), BufferLayout.seq(BufferLayout.u8(), lookup.readonlyIndexes.length, 'readonlyIndexes')]);
      serializedLength += addressTableLookupLayout.encode({
        accountKey: lookup.accountKey.toBytes(),
        encodedWritableIndexesLength: new Uint8Array(encodedWritableIndexesLength),
        writableIndexes: lookup.writableIndexes,
        encodedReadonlyIndexesLength: new Uint8Array(encodedReadonlyIndexesLength),
        readonlyIndexes: lookup.readonlyIndexes
      }, serializedAddressTableLookups, serializedLength);
    }

    return serializedAddressTableLookups.slice(0, serializedLength);
  }

  static deserialize(serializedMessage) {
    let byteArray = [...serializedMessage];
    const prefix = byteArray.shift();
    const maskedPrefix = prefix & VERSION_PREFIX_MASK;
    assert(prefix !== maskedPrefix, `Expected versioned message but received legacy message`);
    const version = maskedPrefix;
    assert(version === 0, `Expected versioned message with version 0 but found version ${version}`);
    const header = {
      numRequiredSignatures: byteArray.shift(),
      numReadonlySignedAccounts: byteArray.shift(),
      numReadonlyUnsignedAccounts: byteArray.shift()
    };
    const staticAccountKeys = [];
    const staticAccountKeysLength = decodeLength(byteArray);

    for (let i = 0; i < staticAccountKeysLength; i++) {
      staticAccountKeys.push(new PublicKey(byteArray.splice(0, PUBLIC_KEY_LENGTH)));
    }

    const recentBlockhash = bs58.encode(byteArray.splice(0, PUBLIC_KEY_LENGTH));
    const instructionCount = decodeLength(byteArray);
    const compiledInstructions = [];

    for (let i = 0; i < instructionCount; i++) {
      const programIdIndex = byteArray.shift();
      const accountKeyIndexesLength = decodeLength(byteArray);
      const accountKeyIndexes = byteArray.splice(0, accountKeyIndexesLength);
      const dataLength = decodeLength(byteArray);
      const data = new Uint8Array(byteArray.splice(0, dataLength));
      compiledInstructions.push({
        programIdIndex,
        accountKeyIndexes,
        data
      });
    }

    const addressTableLookupsCount = decodeLength(byteArray);
    const addressTableLookups = [];

    for (let i = 0; i < addressTableLookupsCount; i++) {
      const accountKey = new PublicKey(byteArray.splice(0, PUBLIC_KEY_LENGTH));
      const writableIndexesLength = decodeLength(byteArray);
      const writableIndexes = byteArray.splice(0, writableIndexesLength);
      const readonlyIndexesLength = decodeLength(byteArray);
      const readonlyIndexes = byteArray.splice(0, readonlyIndexesLength);
      addressTableLookups.push({
        accountKey,
        writableIndexes,
        readonlyIndexes
      });
    }

    return new MessageV0({
      header,
      staticAccountKeys,
      recentBlockhash,
      compiledInstructions,
      addressTableLookups
    });
  }

}

// eslint-disable-next-line no-redeclare
const VersionedMessage = {
  deserializeMessageVersion(serializedMessage) {
    const prefix = serializedMessage[0];
    const maskedPrefix = prefix & VERSION_PREFIX_MASK; // if the highest bit of the prefix is not set, the message is not versioned

    if (maskedPrefix === prefix) {
      return 'legacy';
    } // the lower 7 bits of the prefix indicate the message version


    return maskedPrefix;
  },

  deserialize: serializedMessage => {
    const version = VersionedMessage.deserializeMessageVersion(serializedMessage);

    if (version === 'legacy') {
      return Message.from(serializedMessage);
    }

    if (version === 0) {
      return MessageV0.deserialize(serializedMessage);
    } else {
      throw new Error(`Transaction message version ${version} deserialization is not supported`);
    }
  }
};

/**
 * Transaction signature as base-58 encoded string
 */

let TransactionStatus;
/**
 * Default (empty) signature
 */

(function (TransactionStatus) {
  TransactionStatus[TransactionStatus["BLOCKHEIGHT_EXCEEDED"] = 0] = "BLOCKHEIGHT_EXCEEDED";
  TransactionStatus[TransactionStatus["PROCESSED"] = 1] = "PROCESSED";
  TransactionStatus[TransactionStatus["TIMED_OUT"] = 2] = "TIMED_OUT";
  TransactionStatus[TransactionStatus["NONCE_INVALID"] = 3] = "NONCE_INVALID";
})(TransactionStatus || (TransactionStatus = {}));

const DEFAULT_SIGNATURE = Buffer.alloc(SIGNATURE_LENGTH_IN_BYTES).fill(0);
/**
 * Account metadata used to define instructions
 */

/**
 * Transaction Instruction class
 */
class TransactionInstruction {
  /**
   * Public keys to include in this transaction
   * Boolean represents whether this pubkey needs to sign the transaction
   */

  /**
   * Program Id to execute
   */

  /**
   * Program input
   */
  constructor(opts) {
    this.keys = void 0;
    this.programId = void 0;
    this.data = Buffer.alloc(0);
    this.programId = opts.programId;
    this.keys = opts.keys;

    if (opts.data) {
      this.data = opts.data;
    }
  }
  /**
   * @internal
   */


  toJSON() {
    return {
      keys: this.keys.map(({
        pubkey,
        isSigner,
        isWritable
      }) => ({
        pubkey: pubkey.toJSON(),
        isSigner,
        isWritable
      })),
      programId: this.programId.toJSON(),
      data: [...this.data]
    };
  }

}
/**
 * Pair of signature and corresponding public key
 */

/**
 * Transaction class
 */
class Transaction {
  /**
   * Signatures for the transaction.  Typically created by invoking the
   * `sign()` method
   */

  /**
   * The first (payer) Transaction signature
   */
  get signature() {
    if (this.signatures.length > 0) {
      return this.signatures[0].signature;
    }

    return null;
  }
  /**
   * The transaction fee payer
   */


  /**
   * Construct an empty Transaction
   */
  constructor(opts) {
    this.signatures = [];
    this.feePayer = void 0;
    this.instructions = [];
    this.recentBlockhash = void 0;
    this.lastValidBlockHeight = void 0;
    this.nonceInfo = void 0;
    this.minNonceContextSlot = void 0;
    this._message = void 0;
    this._json = void 0;

    if (!opts) {
      return;
    }

    if (opts.feePayer) {
      this.feePayer = opts.feePayer;
    }

    if (opts.signatures) {
      this.signatures = opts.signatures;
    }

    if (Object.prototype.hasOwnProperty.call(opts, 'nonceInfo')) {
      const {
        minContextSlot,
        nonceInfo
      } = opts;
      this.minNonceContextSlot = minContextSlot;
      this.nonceInfo = nonceInfo;
    } else if (Object.prototype.hasOwnProperty.call(opts, 'lastValidBlockHeight')) {
      const {
        blockhash,
        lastValidBlockHeight
      } = opts;
      this.recentBlockhash = blockhash;
      this.lastValidBlockHeight = lastValidBlockHeight;
    } else {
      const {
        recentBlockhash,
        nonceInfo
      } = opts;

      if (nonceInfo) {
        this.nonceInfo = nonceInfo;
      }

      this.recentBlockhash = recentBlockhash;
    }
  }
  /**
   * @internal
   */


  toJSON() {
    return {
      recentBlockhash: this.recentBlockhash || null,
      feePayer: this.feePayer ? this.feePayer.toJSON() : null,
      nonceInfo: this.nonceInfo ? {
        nonce: this.nonceInfo.nonce,
        nonceInstruction: this.nonceInfo.nonceInstruction.toJSON()
      } : null,
      instructions: this.instructions.map(instruction => instruction.toJSON()),
      signers: this.signatures.map(({
        publicKey
      }) => {
        return publicKey.toJSON();
      })
    };
  }
  /**
   * Add one or more instructions to this Transaction
   */


  add(...items) {
    if (items.length === 0) {
      throw new Error('No instructions');
    }

    items.forEach(item => {
      if ('instructions' in item) {
        this.instructions = this.instructions.concat(item.instructions);
      } else if ('data' in item && 'programId' in item && 'keys' in item) {
        this.instructions.push(item);
      } else {
        this.instructions.push(new TransactionInstruction(item));
      }
    });
    return this;
  }
  /**
   * Compile transaction data
   */


  compileMessage() {
    if (this._message && JSON.stringify(this.toJSON()) === JSON.stringify(this._json)) {
      return this._message;
    }

    let recentBlockhash;
    let instructions;

    if (this.nonceInfo) {
      recentBlockhash = this.nonceInfo.nonce;

      if (this.instructions[0] != this.nonceInfo.nonceInstruction) {
        instructions = [this.nonceInfo.nonceInstruction, ...this.instructions];
      } else {
        instructions = this.instructions;
      }
    } else {
      recentBlockhash = this.recentBlockhash;
      instructions = this.instructions;
    }

    if (!recentBlockhash) {
      throw new Error('Transaction recentBlockhash required');
    }

    if (instructions.length < 1) {
      console.warn('No instructions provided');
    }

    let feePayer;

    if (this.feePayer) {
      feePayer = this.feePayer;
    } else if (this.signatures.length > 0 && this.signatures[0].publicKey) {
      // Use implicit fee payer
      feePayer = this.signatures[0].publicKey;
    } else {
      throw new Error('Transaction fee payer required');
    }

    for (let i = 0; i < instructions.length; i++) {
      if (instructions[i].programId === undefined) {
        throw new Error(`Transaction instruction index ${i} has undefined program id`);
      }
    }

    const programIds = [];
    const accountMetas = [];
    instructions.forEach(instruction => {
      instruction.keys.forEach(accountMeta => {
        accountMetas.push({ ...accountMeta
        });
      });
      const programId = instruction.programId.toString();

      if (!programIds.includes(programId)) {
        programIds.push(programId);
      }
    }); // Append programID account metas

    programIds.forEach(programId => {
      accountMetas.push({
        pubkey: new PublicKey(programId),
        isSigner: false,
        isWritable: false
      });
    }); // Cull duplicate account metas

    const uniqueMetas = [];
    accountMetas.forEach(accountMeta => {
      const pubkeyString = accountMeta.pubkey.toString();
      const uniqueIndex = uniqueMetas.findIndex(x => {
        return x.pubkey.toString() === pubkeyString;
      });

      if (uniqueIndex > -1) {
        uniqueMetas[uniqueIndex].isWritable = uniqueMetas[uniqueIndex].isWritable || accountMeta.isWritable;
        uniqueMetas[uniqueIndex].isSigner = uniqueMetas[uniqueIndex].isSigner || accountMeta.isSigner;
      } else {
        uniqueMetas.push(accountMeta);
      }
    }); // Sort. Prioritizing first by signer, then by writable

    uniqueMetas.sort(function (x, y) {
      if (x.isSigner !== y.isSigner) {
        // Signers always come before non-signers
        return x.isSigner ? -1 : 1;
      }

      if (x.isWritable !== y.isWritable) {
        // Writable accounts always come before read-only accounts
        return x.isWritable ? -1 : 1;
      } // Otherwise, sort by pubkey, stringwise.


      return x.pubkey.toBase58().localeCompare(y.pubkey.toBase58());
    }); // Move fee payer to the front

    const feePayerIndex = uniqueMetas.findIndex(x => {
      return x.pubkey.equals(feePayer);
    });

    if (feePayerIndex > -1) {
      const [payerMeta] = uniqueMetas.splice(feePayerIndex, 1);
      payerMeta.isSigner = true;
      payerMeta.isWritable = true;
      uniqueMetas.unshift(payerMeta);
    } else {
      uniqueMetas.unshift({
        pubkey: feePayer,
        isSigner: true,
        isWritable: true
      });
    } // Disallow unknown signers


    for (const signature of this.signatures) {
      const uniqueIndex = uniqueMetas.findIndex(x => {
        return x.pubkey.equals(signature.publicKey);
      });

      if (uniqueIndex > -1) {
        if (!uniqueMetas[uniqueIndex].isSigner) {
          uniqueMetas[uniqueIndex].isSigner = true;
          console.warn('Transaction references a signature that is unnecessary, ' + 'only the fee payer and instruction signer accounts should sign a transaction. ' + 'This behavior is deprecated and will throw an error in the next major version release.');
        }
      } else {
        throw new Error(`unknown signer: ${signature.publicKey.toString()}`);
      }
    }

    let numRequiredSignatures = 0;
    let numReadonlySignedAccounts = 0;
    let numReadonlyUnsignedAccounts = 0; // Split out signing from non-signing keys and count header values

    const signedKeys = [];
    const unsignedKeys = [];
    uniqueMetas.forEach(({
      pubkey,
      isSigner,
      isWritable
    }) => {
      if (isSigner) {
        signedKeys.push(pubkey.toString());
        numRequiredSignatures += 1;

        if (!isWritable) {
          numReadonlySignedAccounts += 1;
        }
      } else {
        unsignedKeys.push(pubkey.toString());

        if (!isWritable) {
          numReadonlyUnsignedAccounts += 1;
        }
      }
    });
    const accountKeys = signedKeys.concat(unsignedKeys);
    const