From e03fa4b962268802db42a77cfe6b71424e74e9f9 Mon Sep 17 00:00:00 2001
From: Justin Starry <justin@solana.com>
Date: Mon, 3 Feb 2020 21:36:35 +0800
Subject: [PATCH] fix: add typescript type declaration to npm bundle

---
 web3.js/.eslintrc.js      |  15 +-
 web3.js/module.d.ts       | 479 ++++++++++++++++++++++++++++++++++++++
 web3.js/module.flow.js    |   2 +-
 web3.js/package-lock.json | 260 +++++++++++++++++++++
 web3.js/package.json      |   8 +-
 web3.js/rollup.config.js  |   4 +
 6 files changed, 764 insertions(+), 4 deletions(-)
 create mode 100644 web3.js/module.d.ts

diff --git a/web3.js/.eslintrc.js b/web3.js/.eslintrc.js
index 15685dd1d..ae1e91e10 100644
--- a/web3.js/.eslintrc.js
+++ b/web3.js/.eslintrc.js
@@ -1,5 +1,4 @@
 module.exports = {
-  // eslint-disable-line import/no-commonjs
   env: {
     browser: true,
     es6: true,
@@ -47,4 +46,18 @@ module.exports = {
     'require-await': ['error'],
     semi: ['error', 'always'],
   },
+
+  // Used to lint the TypeScript type declaration file
+  overrides: [
+    {
+      files: ['*.d.ts'],
+      parser: '@typescript-eslint/parser',
+      plugins: ['@typescript-eslint'],
+      extends: [
+        'eslint:recommended',
+        'plugin:@typescript-eslint/eslint-recommended',
+        'plugin:@typescript-eslint/recommended',
+      ],
+    },
+  ],
 };
diff --git a/web3.js/module.d.ts b/web3.js/module.d.ts
new file mode 100644
index 000000000..4c2fae5f2
--- /dev/null
+++ b/web3.js/module.d.ts
@@ -0,0 +1,479 @@
+declare module '@solana/web3.js' {
+  import * as BufferLayout from 'buffer-layout';
+
+  // === src/publickey.js ===
+  export class PublicKey {
+    constructor(value: number | string | Buffer | Array<number>);
+    static isPublicKey(o: object): boolean;
+    equals(publickey: PublicKey): boolean;
+    toBase58(): string;
+    toBuffer(): Buffer;
+    toString(): string;
+  }
+
+  // === src/blockhash.js ===
+  export type Blockhash = string;
+
+  // === src/account.js ===
+  export class Account {
+    constructor(secretKey?: Buffer);
+    publicKey: PublicKey;
+    secretKey: Buffer;
+  }
+
+  // === src/fee-calculator.js ===
+  export type FeeCalculator = {
+    burnPercent: number;
+    lamportsPerSignature: number;
+    maxLamportsPerSignature: number;
+    minLamportsPerSignature: number;
+    targetLamportsPerSignature: number;
+    targetSignaturesPerSlot: number;
+  };
+
+  // === src/budget-program.js ===
+
+  /* TODO */
+
+  // === src/connection.js ===
+  export type RpcResponseAndContext<T> = {
+    context: {
+      slot: number;
+    };
+    value: T;
+  };
+
+  export type Commitment = 'max' | 'recent';
+
+  export type SignatureStatusResult = SignatureSuccess | TransactionError;
+
+  export type BlockhashAndFeeCalculator = {
+    blockhash: Blockhash;
+    feeCalculator: FeeCalculator;
+  };
+
+  export type PublicKeyAndAccount = {
+    pubkey: PublicKey;
+    account: AccountInfo;
+  };
+
+  export type AccountInfo = {
+    executable: boolean;
+    owner: PublicKey;
+    lamports: number;
+    data: Buffer;
+    rentEpoch?: number;
+  };
+
+  export type ContactInfo = {
+    id: string;
+    gossip: string;
+    tpu?: string;
+    rpc?: string;
+  };
+
+  export type ConfirmedBlock = {
+    blockhash: Blockhash;
+    previousBlockhash: Blockhash;
+    parentSlot: number;
+    transactions: Array<{
+      transaction: Transaction;
+      meta: {
+        fee: number;
+        preBalances: Array<number>;
+        postBalances: Array<number>;
+        status?: SignatureStatusResult;
+      };
+    }>;
+  };
+
+  export type KeyedAccountInfo = {
+    accountId: PublicKey;
+    accountInfo: AccountInfo;
+  };
+
+  export type Version = {
+    'solana-core': string;
+  };
+
+  export type VoteAccountInfo = {
+    votePubkey: string;
+    nodePubkey: string;
+    stake: number;
+    commission: number;
+  };
+
+  export type SlotInfo = {
+    parent: 'number';
+    slot: 'number';
+    root: 'number';
+  };
+
+  export type AccountChangeCallback = (accountInfo: AccountInfo) => void;
+  export type ProgramAccountChangeCallback = (
+    keyedAccountInfo: KeyedAccountInfo,
+  ) => void;
+  export type SlotChangeCallback = (slotInfo: SlotInfo) => void;
+
+  export type SignatureSuccess = {
+    Ok: null;
+  };
+  export type TransactionError = {
+    Err: object;
+  };
+
+  export type Inflation = {
+    foundation: number;
+    foundationTerm: number;
+    initial: number;
+    storage: number;
+    taper: number;
+    terminal: number;
+  };
+
+  export type EpochSchedule = {
+    slotsPerEpoch: number;
+    leaderScheduleSlotOffset: number;
+    warmup: boolean;
+    firstNormalEpoch: number;
+    firstNormalSlot: number;
+  };
+
+  export type VoteAccountStatus = {
+    current: Array<VoteAccountInfo>;
+    delinquent: Array<VoteAccountInfo>;
+  };
+
+  export class Connection {
+    constructor(endpoint: string, commitment?: Commitment);
+    getAccountInfoAndContext(
+      publicKey: PublicKey,
+      commitment?: Commitment,
+    ): Promise<RpcResponseAndContext<AccountInfo>>;
+    getAccountInfo(
+      publicKey: PublicKey,
+      commitment?: Commitment,
+    ): Promise<AccountInfo>;
+    getProgramAccounts(
+      programId: PublicKey,
+      commitment?: Commitment,
+    ): Promise<Array<PublicKeyAndAccount>>;
+    getBalanceAndContext(
+      publicKey: PublicKey,
+      commitment?: Commitment,
+    ): Promise<RpcResponseAndContext<number>>;
+    getBalance(publicKey: PublicKey, commitment?: Commitment): Promise<number>;
+    getClusterNodes(): Promise<Array<ContactInfo>>;
+    getConfirmedBlock(): Promise<ConfirmedBlock>;
+    getVoteAccounts(commitment?: Commitment): Promise<VoteAccountStatus>;
+    confirmTransactionAndContext(
+      signature: TransactionSignature,
+      commitment?: Commitment,
+    ): Promise<RpcResponseAndContext<boolean>>;
+    confirmTransaction(
+      signature: TransactionSignature,
+      commitment?: Commitment,
+    ): Promise<boolean>;
+    getSlot(commitment?: Commitment): Promise<number>;
+    getSlotLeader(commitment?: Commitment): Promise<string>;
+    getSignatureStatus(
+      signature: TransactionSignature,
+      commitment?: Commitment,
+    ): Promise<SignatureSuccess | TransactionError | null>;
+    getTransactionCount(commitment?: Commitment): Promise<number>;
+    getTotalSupply(commitment?: Commitment): Promise<number>;
+    getVersion(): Promise<Version>;
+    getInflation(commitment?: Commitment): Promise<Inflation>;
+    getEpochSchedule(): Promise<EpochSchedule>;
+    getRecentBlockhashAndContext(
+      commitment?: Commitment,
+    ): Promise<RpcResponseAndContext<BlockhashAndFeeCalculator>>;
+    getRecentBlockhash(
+      commitment?: Commitment,
+    ): Promise<BlockhashAndFeeCalculator>;
+    requestAirdrop(
+      to: PublicKey,
+      amount: number,
+      commitment?: Commitment,
+    ): Promise<TransactionSignature>;
+    sendTransaction(
+      transaction: Transaction,
+      ...signers: Array<Account>
+    ): Promise<TransactionSignature>;
+    sendEncodedTransaction(
+      encodedTransaction: string,
+    ): Promise<TransactionSignature>;
+    sendRawTransaction(wireTransaction: Buffer): Promise<TransactionSignature>;
+    onAccountChange(
+      publickey: PublicKey,
+      callback: AccountChangeCallback,
+    ): number;
+    removeAccountChangeListener(id: number): Promise<void>;
+    onProgramAccountChange(
+      programId: PublicKey,
+      callback: ProgramAccountChangeCallback,
+    ): number;
+    onSlotChange(callback: SlotChangeCallback): number;
+    removeProgramAccountChangeListener(id: number): Promise<void>;
+    validatorExit(): Promise<boolean>;
+    getMinimumBalanceForRentExemption(
+      dataLength: number,
+      commitment?: Commitment,
+    ): Promise<number>;
+  }
+
+  // === src/stake-program.js ===
+  export type StakeAuthorizationType = {
+    index: number;
+  };
+
+  export class Authorized {
+    staker: PublicKey;
+    withdrawer: PublicKey;
+    constructor(staker: PublicKey, withdrawer: PublicKey);
+  }
+
+  export class Lockup {
+    unixTimestamp: number;
+    epoch: number;
+    custodian: PublicKey;
+
+    constructor(unixTimestamp: number, epoch: number, custodian: PublicKey);
+  }
+
+  export class StakeProgram {
+    static programId: PublicKey;
+    static space: number;
+
+    static createAccount(
+      from: PublicKey,
+      stakeAccount: PublicKey,
+      authorized: Authorized,
+      lockup: Lockup,
+      lamports: number,
+    ): Transaction;
+    static createAccountWithSeed(
+      from: PublicKey,
+      stakeAccount: PublicKey,
+      seed: string,
+      authorized: Authorized,
+      lockup: Lockup,
+      lamports: number,
+    ): Transaction;
+    static delegate(
+      stakeAccount: PublicKey,
+      authorizedPubkey: PublicKey,
+      votePubkey: PublicKey,
+    ): Transaction;
+    static authorize(
+      stakeAccount: PublicKey,
+      authorizedPubkey: PublicKey,
+      newAuthorized: PublicKey,
+      stakeAuthorizationType: StakeAuthorizationType,
+    ): Transaction;
+    static split(
+      stakeAccount: PublicKey,
+      authorizedPubkey: PublicKey,
+      lamports: number,
+      splitStakePubkey: PublicKey,
+    ): Transaction;
+    static withdraw(
+      stakeAccount: PublicKey,
+      withdrawerPubkey: PublicKey,
+      to: PublicKey,
+      lamports: number,
+    ): Transaction;
+    static deactivate(
+      stakeAccount: PublicKey,
+      authorizedPubkey: PublicKey,
+    ): Transaction;
+  }
+
+  // === src/system-program.js ===
+  export class SystemProgram {
+    static programId: PublicKey;
+
+    static createAccount(
+      from: PublicKey,
+      newAccount: PublicKey,
+      lamports: number,
+      space: number,
+      programId: PublicKey,
+    ): Transaction;
+    static transfer(
+      from: PublicKey,
+      to: PublicKey,
+      amount: number,
+    ): Transaction;
+    static assign(from: PublicKey, programId: PublicKey): Transaction;
+    static createAccountWithSeed(
+      from: PublicKey,
+      newAccount: PublicKey,
+      base: PublicKey,
+      seed: string,
+      lamports: number,
+      space: number,
+      programId: PublicKey,
+    ): Transaction;
+  }
+
+  // === src/validator-info.js ===
+  export const VALIDATOR_INFO_KEY: PublicKey;
+  export type Info = {
+    name: string;
+    website?: string;
+    details?: string;
+    keybaseUsername?: string;
+  };
+
+  export class ValidatorInfo {
+    key: PublicKey;
+    info: Info;
+
+    constructor(key: PublicKey, info: Info);
+    static fromConfigData(buffer: Buffer): ValidatorInfo | null | undefined;
+  }
+
+  // === src/sysvar.js ===
+  export const SYSVAR_CLOCK_PUBKEY: PublicKey;
+  export const SYSVAR_RENT_PUBKEY: PublicKey;
+  export const SYSVAR_REWARDS_PUBKEY: PublicKey;
+  export const SYSVAR_STAKE_HISTORY_PUBKEY: PublicKey;
+
+  // === src/vote-account.js ===
+  export const VOTE_PROGRAM_ID: PublicKey;
+  export type Lockout = {
+    slot: number;
+    confirmationCount: number;
+  };
+
+  export type EpochCredits = {
+    epoch: number;
+    credits: number;
+    prevCredits: number;
+  };
+
+  export class VoteAccount {
+    votes: Array<Lockout>;
+    nodePubkey: PublicKey;
+    authorizedVoterPubkey: PublicKey;
+    commission: number;
+    rootSlot?: number;
+    epoch: number;
+    credits: number;
+    lastEpochCredits: number;
+    epochCredits: Array<EpochCredits>;
+    static fromAccountData(buffer: Buffer): VoteAccount;
+  }
+
+  // === src/instruction.js ===
+  export type InstructionType = {
+    index: number;
+    layout: typeof BufferLayout;
+  };
+
+  export function encodeData(
+    type: InstructionType,
+    fields: Record<string, object>,
+  ): Buffer;
+
+  // === src/transaction.js ===
+  export type TransactionSignature = string;
+
+  export type TransactionInstructionCtorFields = {
+    keys?: Array<{pubkey: PublicKey; isSigner: boolean; isWritable: boolean}>;
+    programId?: PublicKey;
+    data?: Buffer;
+  };
+
+  export class TransactionInstruction {
+    keys: Array<{
+      pubkey: PublicKey;
+      isSigner: boolean;
+      isWritable: boolean;
+    }>;
+    programId: PublicKey;
+    data: Buffer;
+
+    constructor(opts?: TransactionInstructionCtorFields);
+  }
+
+  export type SignaturePubkeyPair = {
+    signature?: Buffer;
+    publicKey: PublicKey;
+  };
+
+  export type TransactionCtorFields = {
+    recentBlockhash?: Blockhash;
+    signatures?: Array<SignaturePubkeyPair>;
+  };
+
+  export class Transaction {
+    signatures: Array<SignaturePubkeyPair>;
+    signature?: Buffer;
+    instructions: Array<TransactionInstruction>;
+    recentBlockhash?: Blockhash;
+
+    constructor(opts?: TransactionCtorFields);
+    add(
+      ...items: Array<
+        Transaction | TransactionInstruction | TransactionInstructionCtorFields
+      >
+    ): Transaction;
+    sign(...signers: Array<Account>): void;
+    signPartial(...partialSigners: Array<PublicKey | Account>): void;
+    addSigner(signer: Account): void;
+    serialize(): Buffer;
+  }
+
+  // === src/loader.js ===
+  export class Loader {
+    static getMinNumSignatures(dataLength: number): number;
+    static load(
+      connection: Connection,
+      payer: Account,
+      program: Account,
+      programId: PublicKey,
+      data: Array<number>,
+    ): Promise<PublicKey>;
+  }
+
+  // === src/bpf-loader.js ===
+  export class BpfLoader {
+    static programId: PublicKey;
+    static getMinNumSignatures(dataLength: number): number;
+    static load(
+      connection: Connection,
+      payer: Account,
+      elfBytes: Array<number>,
+    ): Promise<PublicKey>;
+  }
+
+  // === src/util/send-and-confirm-transaction.js ===
+  export function sendAndConfirmTransaction(
+    connection: Connection,
+    transaction: Transaction,
+    ...signers: Array<Account>
+  ): Promise<TransactionSignature>;
+
+  export function sendAndConfirmRecentTransaction(
+    connection: Connection,
+    transaction: Transaction,
+    ...signers: Array<Account>
+  ): Promise<TransactionSignature>;
+
+  // === src/util/send-and-confirm-raw-transaction.js ===
+  export function sendAndConfirmRawTransaction(
+    connection: Connection,
+    wireTransaction: Buffer,
+    commitment?: Commitment,
+  ): Promise<TransactionSignature>;
+
+  // === src/util/testnet.js ===
+  export function testnetChannelEndpoint(
+    channel?: string,
+    tls?: boolean,
+  ): string;
+
+  export const LAMPORTS_PER_SOL: number;
+}
diff --git a/web3.js/module.flow.js b/web3.js/module.flow.js
index 5a86d6693..647eb9ff1 100644
--- a/web3.js/module.flow.js
+++ b/web3.js/module.flow.js
@@ -1,7 +1,7 @@
 /**
  * Flow Library definition for @solana/web3.js
  *
- * This file is manually generated from the contents of src/
+ * This file is manually maintained
  *
  * Usage: add the following line under the [libs] section of your project's
  * .flowconfig:
diff --git a/web3.js/package-lock.json b/web3.js/package-lock.json
index fc6dd183d..9ca40b30b 100644
--- a/web3.js/package-lock.json
+++ b/web3.js/package-lock.json
@@ -5924,6 +5924,12 @@
         "@types/node": "*"
       }
     },
+    "@types/eslint-visitor-keys": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
+      "integrity": "sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==",
+      "dev": true
+    },
     "@types/estree": {
       "version": "0.0.39",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.39.tgz",
@@ -5939,6 +5945,26 @@
         "@types/range-parser": "*"
       }
     },
+    "@types/fs-extra": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/@types/fs-extra/-/fs-extra-8.0.1.tgz",
+      "integrity": "sha512-J00cVDALmi/hJOYsunyT52Hva5TnJeKP5yd1r+mH/ZU0mbYZflR0Z5kw5kITtKTRYMhm1JMClOFYdHnQszEvqw==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
+    "@types/glob": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.1.tgz",
+      "integrity": "sha512-1Bh06cbWJUHMC97acuD6UMG29nMt0Aqz1vF3guLfG+kHHJhy3AyohZFFxYk2f7Q1SQIrNwvncxAE0N/9s70F2w==",
+      "dev": true,
+      "requires": {
+        "@types/events": "*",
+        "@types/minimatch": "*",
+        "@types/node": "*"
+      }
+    },
     "@types/istanbul-lib-coverage": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.1.tgz",
@@ -6033,6 +6059,103 @@
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       "dev": true
     },
+    "@typescript-eslint/eslint-plugin": {
+      "version": "2.18.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.18.0.tgz",
+      "integrity": "sha512-kuO8WQjV+RCZvAXVRJfXWiJ8iYEtfHlKgcqqqXg9uUkIolEHuUaMmm8/lcO4xwCOtaw6mY0gStn2Lg4/eUXXYQ==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/experimental-utils": "2.18.0",
+        "eslint-utils": "^1.4.3",
+        "functional-red-black-tree": "^1.0.1",
+        "regexpp": "^3.0.0",
+        "tsutils": "^3.17.1"
+      },
+      "dependencies": {
+        "@typescript-eslint/experimental-utils": {
+          "version": "2.18.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-2.18.0.tgz",
+          "integrity": "sha512-J6MopKPHuJYmQUkANLip7g9I82ZLe1naCbxZZW3O2sIxTiq/9YYoOELEKY7oPg0hJ0V/AQ225h2z0Yp+RRMXhw==",
+          "dev": true,
+          "requires": {
+            "@types/json-schema": "^7.0.3",
+            "@typescript-eslint/typescript-estree": "2.18.0",
+            "eslint-scope": "^5.0.0"
+          }
+        },
+        "@typescript-eslint/typescript-estree": {
+          "version": "2.18.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-2.18.0.tgz",
+          "integrity": "sha512-gVHylf7FDb8VSi2ypFuEL3hOtoC4HkZZ5dOjXvVjoyKdRrvXAOPSzpNRnKMfaUUEiSLP8UF9j9X9EDLxC0lfZg==",
+          "dev": true,
+          "requires": {
+            "debug": "^4.1.1",
+            "eslint-visitor-keys": "^1.1.0",
+            "glob": "^7.1.6",
+            "is-glob": "^4.0.1",
+            "lodash": "^4.17.15",
+            "semver": "^6.3.0",
+            "tsutils": "^3.17.1"
+          }
+        },
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "eslint-utils": {
+          "version": "1.4.3",
+          "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-1.4.3.tgz",
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+          "dev": true,
+          "requires": {
+            "eslint-visitor-keys": "^1.1.0"
+          }
+        },
+        "eslint-visitor-keys": {
+          "version": "1.1.0",
+          "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-1.1.0.tgz",
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+          "dev": true
+        },
+        "glob": {
+          "version": "7.1.6",
+          "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.6.tgz",
+          "integrity": "sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==",
+          "dev": true,
+          "requires": {
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
+          }
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+          "version": "2.1.2",
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+          "dev": true
+        },
+        "regexpp": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-3.0.0.tgz",
+          "integrity": "sha512-Z+hNr7RAVWxznLPuA7DIh8UNX1j9CDrUQxskw9IrBE1Dxue2lyXT+shqEIeLUjrokxIP8CMy1WkjgG3rTsd5/g==",
+          "dev": true
+        },
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "dev": true
+        }
+      }
+    },
     "@typescript-eslint/experimental-utils": {
       "version": "1.13.0",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-1.13.0.tgz",
@@ -6056,6 +6179,87 @@
         }
       }
     },
+    "@typescript-eslint/parser": {
+      "version": "2.18.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-2.18.0.tgz",
+      "integrity": "sha512-SJJPxFMEYEWkM6pGfcnjLU+NJIPo+Ko1QrCBL+i0+zV30ggLD90huEmMMhKLHBpESWy9lVEeWlQibweNQzyc+A==",
+      "dev": true,
+      "requires": {
+        "@types/eslint-visitor-keys": "^1.0.0",
+        "@typescript-eslint/experimental-utils": "2.18.0",
+        "@typescript-eslint/typescript-estree": "2.18.0",
+        "eslint-visitor-keys": "^1.1.0"
+      },
+      "dependencies": {
+        "@typescript-eslint/experimental-utils": {
+          "version": "2.18.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-2.18.0.tgz",
+          "integrity": "sha512-J6MopKPHuJYmQUkANLip7g9I82ZLe1naCbxZZW3O2sIxTiq/9YYoOELEKY7oPg0hJ0V/AQ225h2z0Yp+RRMXhw==",
+          "dev": true,
+          "requires": {
+            "@types/json-schema": "^7.0.3",
+            "@typescript-eslint/typescript-estree": "2.18.0",
+            "eslint-scope": "^5.0.0"
+          }
+        },
+        "@typescript-eslint/typescript-estree": {
+          "version": "2.18.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-2.18.0.tgz",
+          "integrity": "sha512-gVHylf7FDb8VSi2ypFuEL3hOtoC4HkZZ5dOjXvVjoyKdRrvXAOPSzpNRnKMfaUUEiSLP8UF9j9X9EDLxC0lfZg==",
+          "dev": true,
+          "requires": {
+            "debug": "^4.1.1",
+            "eslint-visitor-keys": "^1.1.0",
+            "glob": "^7.1.6",
+            "is-glob": "^4.0.1",
+            "lodash": "^4.17.15",
+            "semver": "^6.3.0",
+            "tsutils": "^3.17.1"
+          }
+        },
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "eslint-visitor-keys": {
+          "version": "1.1.0",
+          "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-1.1.0.tgz",
+          "integrity": "sha512-8y9YjtM1JBJU/A9Kc+SbaOV4y29sSWckBwMHa+FGtVj5gN/sbnKDf6xJUl+8g7FAij9LVaP8C24DUiH/f/2Z9A==",
+          "dev": true
+        },
+        "glob": {
+          "version": "7.1.6",
+          "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.6.tgz",
+          "integrity": "sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==",
+          "dev": true,
+          "requires": {
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        },
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "dev": true
+        }
+      }
+    },
     "@typescript-eslint/typescript-estree": {
       "version": "1.13.0",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-1.13.0.tgz",
@@ -7963,6 +8167,12 @@
       "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
       "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU="
     },
+    "colorette": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/colorette/-/colorette-1.1.0.tgz",
+      "integrity": "sha512-6S062WDQUXi6hOfkO/sBPVwE5ASXY4G2+b4atvhJfSsuUUhIaUKlkjLe9692Ipyt5/a+IPF5aVTu3V5gvXq5cg==",
+      "dev": true
+    },
     "colors": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/colors/-/colors-1.0.3.tgz",
@@ -21301,6 +21511,47 @@
         }
       }
     },
+    "rollup-plugin-copy": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/rollup-plugin-copy/-/rollup-plugin-copy-3.3.0.tgz",
+      "integrity": "sha512-euDjCUSBXZa06nqnwCNADbkAcYDfzwowfZQkto9K/TFhiH+QG7I4PUsEMwM9tDgomGWJc//z7KLW8t+tZwxADA==",
+      "dev": true,
+      "requires": {
+        "@types/fs-extra": "^8.0.1",
+        "colorette": "^1.1.0",
+        "fs-extra": "^8.1.0",
+        "globby": "10.0.1",
+        "is-plain-object": "^3.0.0"
+      },
+      "dependencies": {
+        "fs-extra": {
+          "version": "8.1.0",
+          "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
+          "integrity": "sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==",
+          "dev": true,
+          "requires": {
+            "graceful-fs": "^4.2.0",
+            "jsonfile": "^4.0.0",
+            "universalify": "^0.1.0"
+          }
+        },
+        "graceful-fs": {
+          "version": "4.2.3",
+          "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.3.tgz",
+          "integrity": "sha512-a30VEBm4PEdx1dRB7MFK7BejejvCvBronbLjht+sHuGYj8PHs7M/5Z+rt5lw551vZ7yfTCj4Vuyy3mSJytDWRQ==",
+          "dev": true
+        },
+        "is-plain-object": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-plain-object/-/is-plain-object-3.0.0.tgz",
+          "integrity": "sha512-tZIpofR+P05k8Aocp7UI/2UTa9lTJSebCXpFFoR9aibpokDj/uXBsJ8luUu0tTVYKkMU6URDUuOfJZ7koewXvg==",
+          "dev": true,
+          "requires": {
+            "isobject": "^4.0.0"
+          }
+        }
+      }
+    },
     "rollup-plugin-json": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/rollup-plugin-json/-/rollup-plugin-json-4.0.0.tgz",
@@ -23819,6 +24070,15 @@
       "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
       "dev": true
     },
+    "tsutils": {
+      "version": "3.17.1",
+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.17.1.tgz",
+      "integrity": "sha512-kzeQ5B8H3w60nFY2g8cJIuH7JDpsALXySGtwGJ0p2LSjLgay3NdIpqq5SoOBe46bKDW2iq25irHCr8wjomUS2g==",
+      "dev": true,
+      "requires": {
+        "tslib": "^1.8.1"
+      }
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
diff --git a/web3.js/package.json b/web3.js/package.json
index 0fe95518f..d8b049e7d 100644
--- a/web3.js/package.json
+++ b/web3.js/package.json
@@ -21,6 +21,7 @@
   },
   "main": "lib/index.cjs.js",
   "module": "lib/index.esm.js",
+  "types": "lib/index.d.ts",
   "bin": {
     "solana-bpf-sdk-install": "bin/bpf-sdk-install.sh",
     "solana-localnet": "bin/localnet.sh"
@@ -49,7 +50,7 @@
     "flow": "set -ex; flow stop; flow-typed install jest@24; flow",
     "flow:stop": "flow stop",
     "flow:watch": "flow stop; watch 'flow' . --wait=1 --ignoreDirectoryPattern=/doc/",
-    "lint": "set -ex; npm run pretty; eslint .",
+    "lint": "set -ex; npm run pretty; eslint . --ext .js,.ts",
     "lint:fix": "npm run lint -- --fix",
     "lint:watch": "watch 'npm run lint:fix' . --wait=1 --ignoreDirectoryPattern=/doc/",
     "localnet:down": "bin/localnet.sh down",
@@ -58,7 +59,7 @@
     "localnet:update": "bin/localnet.sh update",
     "ok": "run-s lint flow test doc",
     "prepare": "run-s clean bpf-sdk:install bpf-sdk:remove-symlinks build",
-    "pretty": "prettier --write '{,{examples,src,test}/**/}*.js'",
+    "pretty": "prettier --write '{,{examples,src,test}/**/}*.{j,t}s'",
     "re": "semantic-release --repository-url git@github.com:solana-labs/solana-web3.js.git",
     "test": "npm run build:fixtures && cross-env NODE_ENV=test jest --useStderr",
     "test:cover": "npm run build:fixtures && cross-env NODE_ENV=test jest --coverage --useStderr",
@@ -90,6 +91,8 @@
     "@babel/preset-flow": "^7.0.0",
     "@commitlint/config-conventional": "^8.0.0",
     "@commitlint/travis-cli": "^8.0.0",
+    "@typescript-eslint/eslint-plugin": "^2.18.0",
+    "@typescript-eslint/parser": "^2.18.0",
     "acorn": "^7.0.0",
     "babel-eslint": "10.0.3",
     "babel-plugin-module-resolver": "3.2.0",
@@ -117,6 +120,7 @@
     "rollup": "1.15.2",
     "rollup-plugin-babel": "^4.3.2",
     "rollup-plugin-commonjs": "^10.0.0",
+    "rollup-plugin-copy": "^3.3.0",
     "rollup-plugin-json": "^4.0.0",
     "rollup-plugin-node-builtins": "^2.1.2",
     "rollup-plugin-node-globals": "^1.2.1",
diff --git a/web3.js/rollup.config.js b/web3.js/rollup.config.js
index 5d18f7936..4373053e0 100644
--- a/web3.js/rollup.config.js
+++ b/web3.js/rollup.config.js
@@ -1,6 +1,7 @@
 import babel from 'rollup-plugin-babel';
 import builtins from 'rollup-plugin-node-builtins';
 import commonjs from 'rollup-plugin-commonjs';
+import copy from 'rollup-plugin-copy';
 import globals from 'rollup-plugin-node-globals';
 import json from 'rollup-plugin-json';
 import nodeResolve from 'rollup-plugin-node-resolve';
@@ -22,6 +23,9 @@ function generateConfig(configType) {
         'process.env.NODE_ENV': JSON.stringify(env),
       }),
       commonjs(),
+      copy({
+        targets: [{src: 'module.d.ts', dest: 'lib', rename: 'index.d.ts'}],
+      }),
     ],
   };