Convert from Flow to Typescript (#816)

* convert to typescript
* add docs for custom node typing
* update webpack, gulpfile

src/api.ts

@@ -0,0 +1,153 @@
+import * as _ from 'lodash'
+import {EventEmitter} from 'events'
+import {Connection, errors, validate} from './common'
+import * as server from './server/server'
+const connect = server.connect
+const disconnect = server.disconnect
+const getServerInfo = server.getServerInfo
+const getFee = server.getFee
+const isConnected = server.isConnected
+const getLedgerVersion = server.getLedgerVersion
+import getTransaction from './ledger/transaction'
+import getTransactions from './ledger/transactions'
+import getTrustlines from './ledger/trustlines'
+import getBalances from './ledger/balances'
+import getBalanceSheet from './ledger/balance-sheet'
+import getPaths from './ledger/pathfind'
+import getOrders from './ledger/orders'
+import getOrderbook from './ledger/orderbook'
+import getSettings from './ledger/settings'
+import getAccountInfo from './ledger/accountinfo'
+import getPaymentChannel from './ledger/payment-channel'
+import preparePayment from './transaction/payment'
+import prepareTrustline from './transaction/trustline'
+import prepareOrder from './transaction/order'
+import prepareOrderCancellation from './transaction/ordercancellation'
+import prepareEscrowCreation from './transaction/escrow-creation'
+import prepareEscrowExecution from './transaction/escrow-execution'
+import prepareEscrowCancellation from './transaction/escrow-cancellation'
+import preparePaymentChannelCreate from './transaction/payment-channel-create'
+import preparePaymentChannelFund from './transaction/payment-channel-fund'
+import preparePaymentChannelClaim from './transaction/payment-channel-claim'
+import prepareSettings from './transaction/settings'
+import sign from './transaction/sign'
+import combine from './transaction/combine'
+import submit from './transaction/submit'
+import {generateAddressAPI} from './offline/generate-address'
+import computeLedgerHash from './offline/ledgerhash'
+import signPaymentChannelClaim from './offline/sign-payment-channel-claim'
+import verifyPaymentChannelClaim from './offline/verify-payment-channel-claim'
+import getLedger from './ledger/ledger'
+
+
+import RangeSet from './common/rangeset'
+import * as ledgerUtils from './ledger/utils'
+import * as schemaValidator from './common/schema-validator'
+
+type APIOptions = {
+  server?: string,
+  feeCushion?: number,
+  trace?: boolean,
+  proxy?: string,
+  timeout?: number
+}
+
+// prevent access to non-validated ledger versions
+class RestrictedConnection extends Connection {
+  request(request: any, timeout?: number) {
+    const ledger_index = request.ledger_index
+    if (ledger_index !== undefined && ledger_index !== 'validated') {
+      if (!_.isNumber(ledger_index) || ledger_index > this._ledgerVersion) {
+        return Promise.reject(new errors.LedgerVersionError(
+          `ledgerVersion ${ledger_index} is greater than server\'s ` +
+          `most recent validated ledger: ${this._ledgerVersion}`))
+      }
+    }
+    return super.request(request, timeout)
+  }
+}
+
+class RippleAPI extends EventEmitter {
+
+  _feeCushion: number
+  connection: RestrictedConnection
+
+  // these are exposed only for use by unit tests; they are not part of the API.
+  static _PRIVATE = {
+    validate: validate,
+    RangeSet,
+    ledgerUtils,
+    schemaValidator
+  }
+
+  constructor(options: APIOptions = {}) {
+    super()
+    validate.apiOptions(options)
+    this._feeCushion = options.feeCushion || 1.2
+    const serverURL = options.server
+    if (serverURL !== undefined) {
+      this.connection = new RestrictedConnection(serverURL, options)
+      this.connection.on('ledgerClosed', message => {
+        this.emit('ledger', server.formatLedgerClose(message))
+      })
+      this.connection.on('error', (errorCode, errorMessage, data) => {
+        this.emit('error', errorCode, errorMessage, data)
+      })
+      this.connection.on('connected', () => {
+        this.emit('connected')
+      })
+      this.connection.on('disconnected', code => {
+        this.emit('disconnected', code)
+      })
+    } else {
+      // use null object pattern to provide better error message if user
+      // tries to call a method that requires a connection
+      this.connection = new RestrictedConnection(null, options)
+    }
+  }
+
+  connect = connect
+  disconnect = disconnect
+  isConnected = isConnected
+  getServerInfo = getServerInfo
+  getFee = getFee
+  getLedgerVersion = getLedgerVersion
+
+  getTransaction = getTransaction
+  getTransactions = getTransactions
+  getTrustlines = getTrustlines
+  getBalances = getBalances
+  getBalanceSheet = getBalanceSheet
+  getPaths = getPaths
+  getOrders = getOrders
+  getOrderbook = getOrderbook
+  getSettings = getSettings
+  getAccountInfo = getAccountInfo
+  getPaymentChannel = getPaymentChannel
+  getLedger = getLedger
+
+  preparePayment = preparePayment
+  prepareTrustline = prepareTrustline
+  prepareOrder = prepareOrder
+  prepareOrderCancellation = prepareOrderCancellation
+  prepareEscrowCreation = prepareEscrowCreation
+  prepareEscrowExecution = prepareEscrowExecution
+  prepareEscrowCancellation = prepareEscrowCancellation
+  preparePaymentChannelCreate = preparePaymentChannelCreate
+  preparePaymentChannelFund = preparePaymentChannelFund
+  preparePaymentChannelClaim = preparePaymentChannelClaim
+  prepareSettings = prepareSettings
+  sign = sign
+  combine = combine
+  submit = submit
+
+  generateAddress = generateAddressAPI
+  computeLedgerHash = computeLedgerHash
+  signPaymentChannelClaim = signPaymentChannelClaim
+  verifyPaymentChannelClaim = verifyPaymentChannelClaim
+  errors = errors
+}
+
+export {
+  RippleAPI
+}