Declaring types within the repos packages itself

packages/web3-utils/README.md

@@ -39,6 +39,10 @@ console.log(Utils);
 }
 ```
 
+## Types 
+
+If you are using TypeScript all the types are defined in the `index.d.ts` - please use them :)
+
 
 [docs]: http://web3js.readthedocs.io/en/1.0/
 [repo]: https://github.com/ethereum/web3.js

packages/web3-utils/index.d.ts

@@ -0,0 +1,137 @@
+import BigNumber from "bn.js";
+import us from "underscore";
+
+export type Unit =
+    | "noether"
+    | "wei"
+    | "kwei"
+    | "Kwei"
+    | "babbage"
+    | "femtoether"
+    | "mwei"
+    | "Mwei"
+    | "lovelace"
+    | "picoether"
+    | "gwei"
+    | "Gwei"
+    | "shannon"
+    | "nanoether"
+    | "nano"
+    | "szabo"
+    | "microether"
+    | "micro"
+    | "finney"
+    | "milliether"
+    | "milli"
+    | "ether"
+    | "kether"
+    | "grand"
+    | "mether"
+    | "gether"
+    | "tether";
+
+export type Mixed =
+    | string
+    | number
+    | BigNumber
+    | {
+        type: string;
+        value: string;
+    }
+    | {
+        t: string;
+        v: string;
+    };
+
+export type Hex = string | number;
+
+export declare class BN extends BigNumber {
+    constructor(
+        number: number | string | number[] | Buffer | BN,
+        base?: number | 'hex',
+        endian?: 'le' | 'be'
+    )
+    super(number, base, endian);
+ }
+
+export interface _ extends us.UnderscoreStatic { }
+
+// utils types
+export declare function isBN(value: string | number): boolean;
+export declare function isBigNumber(value: BigNumber): boolean;
+export declare function toBN(number: number | string): BigNumber;
+export declare function toTwosComplement(number: number | string | BigNumber): string;
+export declare function isAddress(address: string): boolean;
+export declare function isHex(hex: Hex): boolean;
+export declare function isHexStrict(hex: Hex): boolean;
+export declare function asciiToHex(string: string): string;
+export declare function hexToAscii(string: string): string;
+export declare function toAscii(string: string): string;
+export declare function bytesToHex(bytes: number[]): string;
+export declare function numberToHex(value: number | string | BigNumber): string;
+export declare function checkAddressChecksum(address: string): boolean;
+export declare function fromAscii(string: string): string;
+export declare function fromDecimal(value: string | number | BigNumber): string;
+export declare function fromUtf8(string: string): string;
+export declare function fromWei(value: BigNumber, unit?: Unit): BigNumber | string;
+export declare function hexToBytes(hex: Hex): number[];
+export declare function hexToNumber(hex: Hex): number;
+export declare function hexToNumberString(hex: Hex): string;
+export declare function hexToString(hex: Hex): string;
+export declare function hexToUtf8(string: string): string;
+export declare function keccak256(string: string): string;
+export declare function padLeft(string: string, characterAmount: number, sign?: string): string;
+export declare function leftPad(string: string, characterAmount: number, sign?: string): string;
+export declare function rightPad(string: string, characterAmount: number, sign?: string): string;
+export declare function padRight(string: string, characterAmount: number, sign?: string): string;
+export declare function sha3(value: Mixed): string;
+export declare function randomHex(bytesSize: number): string;
+export declare function utf8ToHex(string: string): string;
+export declare function stringToHex(string: string): string;
+export declare function toChecksumAddress(address: string): string;
+export declare function toDecimal(hex: Hex): number;
+export declare function toHex(value: Mixed): string;
+export declare function toUtf8(string: string): string;
+export declare function toWei(value: number | string | BigNumber, unit?: Unit): BigNumber | string;
+export declare function isBloom(bloom: string): boolean;
+export declare function isTopic(topic: string): boolean;
+export declare function _fireError(error: Object, emitter: Object, reject: Function, callback: Function): Object;
+export declare function _jsonInterfaceMethodToString(json: Object): string;
+export declare function _flattenTypes(includeTuple: boolean, puts: Object): string[];
+export declare function soliditySha3(...val: Mixed[]): string;
+export declare function getUnitValue(unit: string): string;
+export declare function unitMap(): IUnits;
+
+// bloom types
+export declare function testAddress(bloom: string, address: string): boolean;
+export declare function testTopic(bloom: string, topic: string): boolean;
+
+export interface IUnits {
+    noether: string;
+    wei: string;
+    kwei: string;
+    Kwei: string;
+    babbage: string;
+    femtoether: string;
+    mwei: string;
+    Mwei: string;
+    lovelace: string;
+    picoether: string;
+    gwei: string;
+    Gwei: string;
+    shannon: string;
+    nanoether: string;
+    nano: string;
+    szabo: string;
+    microether: string;
+    micro: string;
+    finney: string;
+    milliether: string;
+    milli: string;
+    ether: string;
+    kether: string;
+    grand: string;
+    mether: string;
+    gether: string;
+    tether: string;
+}

packages/web3-utils/package.json

@@ -5,7 +5,13 @@
     "description": "Collection of utility functions used in web3.js.",
     "repository": "https://github.com/ethereum/web3.js/tree/master/packages/web3-utils",
     "license": "LGPL-3.0",
-    "main": "src/index.js",
+    "main": "dist/web3-utils.cjs.js",
+    "module": "dist/web3-utils.esm.js",
+    "browser": "dist/web3-utils.umd.js",
+    "scripts": {
+        "build": "rollup -c",
+        "dev": "rollup -c -w"
+    },
     "dependencies": {
         "bn.js": "4.11.8",
         "eth-lib": "0.2.8",

packages/web3-utils/src/Utils.js

@@ -256,7 +256,7 @@ export const hexToUtf8 = (hex) => {
  *
  * @param {String|Number|BN} value
  *
- * @returns {String}
+ * @returns {Number}
  */
 export const hexToNumber = (value) => {
     if (!value) {

packages/web3-utils/src/index.js

@@ -25,7 +25,7 @@ import {isObject, isString, isArray, isFunction} from 'underscore';
 import * as utils from './Utils';
 
 export {soliditySha3} from './SoliditySha3';
-export randomHex from 'randomhex';
+export {randomHex} from 'randomhex';
 export * from './Utils';
 
 export const unitMap = {