cellog

// the example from typescript's docs
// The type T is never explicitly specified and can be any type that supports keyof
function getProperty<T, K extends keyof T>(obj: T, key: K) {
    return obj[key];
}

let x = { a: 1, b: 2, c: 3, d: 4 };

getProperty(x, "a"); // okay
getProperty(x, "m"); // error: Argument of type 'm' isn't assignable to 'a' | 'b' | 'c' | 'd'.

cellog

// basic type inference
function inferred() {
  const a = 'hi'
  return a
}

// inferred from interface definition
interface DefinesTypes {
  inferred: (first: number, second: string) => number
}

cellog

import BlockchainHandler from './blockchainHandler/BlockchainHandler'
import {
  ConstantsType,
  BlockchainData,
  FetchWindow,
  SetTimeoutWindow,
} from './blockchainHandler/blockChainTypes'
import { isValidPaywallConfig } from '../utils/validators'
import { PaywallConfig, PurchaseKeyRequest } from '../unlockTypes'
import { IframePostOfficeWindow } from '../windowTypes'

cellog

import { PaywallConfig, Locks, Lock, Transactions } from '../../unlockTypes'
import { EventEmitter } from 'events'
import linkKeysToLocks from './linkKeysToLocks'
import { POLLING_INTERVAL } from '../../constants'

type Web3ProviderType = string | Object

export interface WalletServiceType extends EventEmitter {
  ready: boolean
  connect: (provider: Web3ProviderType) => Promise<void>

cellog

gregorybeaver@Gregorys-MacBook-Pro ~/Documents/GitHub/unlock (greg-1882-show-lock-int-test) $ scripts/build-image.sh unlock
Sending build context to Docker daemon  89.34MB
Step 1/53 : FROM node:8.11.4-alpine
8.11.4-alpine: Pulling from library/node
a073c86ecf9e: Pull complete 
db7179d8c6cd: Pull complete 
66b9cfaecc8c: Pull complete 
Digest: sha256:1c38d992f89ae389450bc69799a0f2b7d1f9f2e6c445080a4648448e6449e8e4
Status: Downloaded newer image for node:8.11.4-alpine
 ---> 8adf3c3eb26c

cellog

regorybeaver@Gregorys-MacBook-Pro ~/Documents/GitHub/unlock (greg-1882-show-lock-int-test) $ scripts/build-image.sh unlock
Sending build context to Docker daemon  89.34MB
Step 1/53 : FROM node:8.11.4-alpine
8.11.4-alpine: Pulling from library/node
a073c86ecf9e: Pull complete 
db7179d8c6cd: Pull complete 
66b9cfaecc8c: Pull complete 
Digest: sha256:1c38d992f89ae389450bc69799a0f2b7d1f9f2e6c445080a4648448e6449e8e4
Status: Downloaded newer image for node:8.11.4-alpine
 ---> 8adf3c3eb26c

cellog

export function makeGetTransactionInfo({
  web3,
  transactionHash,
  mineTransaction,
  failTransaction,
}) {
  const getTransactionInfo = async transaction => {
    if (!transactionHash) return
    const [blockNumber, blockTransaction] = await Promise.all([
      web3.eth.getBlockNumber(),

cellog

export function sendNewKeyPurchaseTransaction({
  to,
  from,
  data,
  value,
  gas,
  wallet,
  newTransaction,
  mineTransaction,
  failTransaction,

cellog

export function makeGetTransactionInfo({
  web3,
  transactionHash,
  startTransaction,
  mineTransaction,
  failTransaction,
}) {
  const getTransactionInfo = async transaction => {
    if (!transactionHash) return
    const [blockNumber, blockTransaction] = await Promise.all([

cellog

https://codesandbox.io/s/73w2kq8mvj