meta - transactions - docs yo!

app/scripts/controllers/transactions/README.md

@@ -0,0 +1,92 @@
+# Transaction Controller
+
+Transaction Controller is an aggregate of sub-controllers and trackers
+composing them in a way to be exposed to the metamask controller
+
+- txStateManager
+    responsible for the state of a transaction and
+    storing the transaction
+- pendingTxTracker
+    watching blocks for transactions to be include
+    and emitting confirmed events
+- txGasUtil
+    gas calculations and safety buffering
+- nonceTracker
+    calculating nonces
+
+## flow digram of processing a transaction
+
+![transaction-flow](../../../../docs/transaction-flow.png)
+
+## txMeta's && txParams
+
+A txMeta is the "meta" object it has all the random bits of info we need about a transaction on it. txParams are sacred every thing on txParams gets signed so it must
+be a valid key and be hex prefixed except for the network number. Extra stuff must go on the txMeta!
+
+Here is a txMeta too look at:
+
+```js
+txMeta = {
+  "id": 2828415030114568, // unique id for this txMeta used for look ups
+  "time": 1524094064821, // time of creation
+  "status": "confirmed",
+  "metamaskNetworkId": "1524091532133", //the network id for the transaction
+  "loadingDefaults": false, // used to tell the ui when we are done calculatyig gass defaults
+  "txParams": { // the txParams object
+    "from": "0x8acce2391c0d510a6c5e5d8f819a678f79b7e675",
+    "to": "0x8acce2391c0d510a6c5e5d8f819a678f79b7e675",
+    "value": "0x0",
+    "gasPrice": "0x3b9aca00",
+    "gas": "0x7b0c",
+    "nonce": "0x0"
+  },
+  "history": [{ //debug
+            "id": 2828415030114568,
+            "time": 1524094064821,
+            "status": "unapproved",
+            "metamaskNetworkId": "1524091532133",
+            "loadingDefaults": true,
+            "txParams": {
+              "from": "0x8acce2391c0d510a6c5e5d8f819a678f79b7e675",
+              "to": "0x8acce2391c0d510a6c5e5d8f819a678f79b7e675",
+              "value": "0x0"
+            }
+          },
+          [
+            {
+              "op": "add",
+              "path": "/txParams/gasPrice",
+              "value": "0x3b9aca00"
+            },
+            ...], // I've removed most of history for this
+  "gasPriceSpecified": false, //weather or not the user/dapp has specified gasPrice
+  "gasLimitSpecified": false, //weather or not the user/dapp has specified gas
+  "estimatedGas": "5208",
+  "origin": "MetaMask", //debug
+  "nonceDetails": {
+    "params": {
+      "highestLocallyConfirmed": 0,
+      "highestSuggested": 0,
+      "nextNetworkNonce": 0
+    },
+    "local": {
+      "name": "local",
+      "nonce": 0,
+      "details": {
+        "startPoint": 0,
+        "highest": 0
+      }
+    },
+    "network": {
+      "name": "network",
+      "nonce": 0,
+      "details": {
+        "baseCount": 0
+      }
+    }
+  },
+  "rawTx": "0xf86980843b9aca00827b0c948acce2391c0d510a6c5e5d8f819a678f79b7e67580808602c5b5de66eea05c01a320b96ac730cb210ca56d2cb71fa360e1fc2c21fa5cf333687d18eb323fa02ed05987a6e5fd0f2459fcff80710b76b83b296454ad9a37594a0ccb4643ea90", // used for rebroadcast
+  "hash": "0xa45ba834b97c15e6ff4ed09badd04ecd5ce884b455eb60192cdc73bcc583972a",
+  "submittedTime": 1524094077902 // time of the attempt to submit the raw tx to the network, used in the ui to show the retry button
+}
+```

app/scripts/controllers/transactions/index.js

@@ -25,14 +25,15 @@ const txUtils = require('./lib/util')
 
 
 @param {object} opts -
-  - initState, initial transaction list default is an empty array<br>
+  @property  {object} opts.initState initial transaction list default is an empty array
-  - networkStore, an observable store for network number<br>
+  @property  {Object} opts.networkStore an observable store for network number
-  - blockTracker,<br>
+  @property  {Object} opts.blockTracker
-  - provider,<br>
+  @property  {Object} opts.provider
-  - signTransaction, function the signs an ethereumjs-tx<br>
+  @property  {Object} opts.signTransaction function the signs an ethereumjs-tx
-  - getGasPrice, optional gas price calculator<br>
+  @property  {function} opts.getGasPrice optional gas price calculator
-  - txHistoryLimit, number *optional* for limiting how many transactions are in state <br>
+  @property  {function} opts.signTransaction ethTx signer that returns a rawTx
-  - preferencesStore,
+  @property  {number} opts.txHistoryLimit number *optional* for limiting how many transactions are in state
+  @property  {Object} opts.preferencesStore
 @class
 */
 
@@ -50,12 +51,12 @@ class TransactionController extends EventEmitter {
     this.query = new EthQuery(this.provider)
     this.txGasUtil = new TxGasUtil(this.provider)
 
+    this._mapMethods()
     this.txStateManager = new TransactionStateManager({
       initState: opts.initState,
       txHistoryLimit: opts.txHistoryLimit,
       getNetwork: this.getNetwork.bind(this),
     })
-    this._mapMethods()
     this._onBootCleanUp()
 
     this.store = this.txStateManager.store
@@ -92,7 +93,10 @@ class TransactionController extends EventEmitter {
     }
   }
 
-/** Adds a tx to the txlist */
+/**
+  Adds a tx to the txlist
+  @emits ${txMeta.id}:unapproved
+*/
   addTx (txMeta) {
     this.txStateManager.addTx(txMeta)
     this.emit(`${txMeta.id}:unapproved`, txMeta)
@@ -172,6 +176,7 @@ add a new unapproved transaction to the pipeline
   async addTxGasDefaults (txMeta) {
     const txParams = txMeta.txParams
     // ensure value
+    txParams.value = txParams.value ? ethUtil.addHexPrefix(value) : '0x0',
     txMeta.gasPriceSpecified = Boolean(txParams.gasPrice)
     let gasPrice = txParams.gasPrice
     if (!gasPrice) {

app/scripts/controllers/transactions/lib/tx-state-history-helper.js

@@ -1,6 +1,6 @@
 const jsonDiffer = require('fast-json-patch')
 const clone = require('clone')
-
+/** @module*/
 module.exports = {
   generateHistoryEntry,
   replayHistory,
@@ -8,7 +8,11 @@ module.exports = {
   migrateFromSnapshotsToDiffs,
 }
 
-
+/**
+  converts non-initial history entries into diffs
+  @param longHistory {array}
+  @returns {array}
+*/
 function migrateFromSnapshotsToDiffs (longHistory) {
   return (
     longHistory
@@ -20,6 +24,17 @@ function migrateFromSnapshotsToDiffs (longHistory) {
   )
 }
 
+/**
+  generates an array of history objects sense the previous state.
+  The object has the keys opp(the operation preformed),
+  path(the key and if a nested object then each key will be seperated with a `/`)
+  value
+  with the first entry having the note
+  @param previousState {object} - the previous state of the object
+  @param newState {object} - the update object
+  @param note {string} - a optional note for the state change
+  @reurns {array}
+*/
 function generateHistoryEntry (previousState, newState, note) {
   const entry = jsonDiffer.compare(previousState, newState)
   // Add a note to the first op, since it breaks if we append it to the entry
@@ -27,11 +42,19 @@ function generateHistoryEntry (previousState, newState, note) {
   return entry
 }
 
+/**
+  Recovers previous txMeta state obj
+  @return {object}
+*/
 function replayHistory (_shortHistory) {
   const shortHistory = clone(_shortHistory)
   return shortHistory.reduce((val, entry) => jsonDiffer.applyPatch(val, entry).newDocument)
 }
 
+/**
+  @param txMeta {object}
+  @returns {object} a clone object of the txMeta with out history
+*/
 function snapshotFromTxMeta (txMeta) {
   // create txMeta snapshot for history
   const snapshot = clone(txMeta)

app/scripts/controllers/transactions/lib/util.js

@@ -3,11 +3,15 @@ const {
   isValidAddress,
 } = require('ethereumjs-util')
 
+/**
+@module
+*/
 module.exports = {
   normalizeTxParams,
   validateTxParams,
   validateFrom,
   validateRecipient,
+  getFinalStates,
 }
 
 
@@ -16,22 +20,30 @@ const normalizers = {
   from: from => addHexPrefix(from).toLowerCase(),
   to: to => addHexPrefix(to).toLowerCase(),
   nonce: nonce => addHexPrefix(nonce),
-  value: value =>  value ? addHexPrefix(value) : '0x0',
+  value: value => addHexPrefix(value),
   data: data => addHexPrefix(data),
   gas: gas => addHexPrefix(gas),
   gasPrice: gasPrice => addHexPrefix(gasPrice),
 }
+
  /**
+  normalizes txParams
+  @param txParams {object}
+  @returns {object} normalized txParams
  */
 function normalizeTxParams (txParams) {
   // apply only keys in the normalizers
   const normalizedTxParams = {}
-  for (let key in normalizers) {
+  for (const key in normalizers) {
     if (txParams[key]) normalizedTxParams[key] = normalizers[key](txParams[key])
   }
   return normalizedTxParams
 }
 
+ /**
+  validates txParams
+  @param txParams {object}
+ */
 function validateTxParams (txParams) {
   validateFrom(txParams)
   validateRecipient(txParams)
@@ -47,11 +59,19 @@ function validateTxParams (txParams) {
   }
 }
 
+ /**
+  validates the from field in  txParams
+  @param txParams {object}
+ */
 function validateFrom (txParams) {
   if (!(typeof txParams.from === 'string')) throw new Error(`Invalid from address ${txParams.from} not a string`)
   if (!isValidAddress(txParams.from)) throw new Error('Invalid from address')
 }
 
+ /**
+  validates the to field in  txParams
+  @param txParams {object}
+ */
 function validateRecipient (txParams) {
   if (txParams.to === '0x' || txParams.to === null) {
     if (txParams.data) {
@@ -64,3 +84,16 @@ function validateRecipient (txParams) {
   }
   return txParams
 }
+
+  /**
+    @returns an {array} of states that can be considered final
+  */
+function getFinalStates () {
+  return [
+    'rejected', // the user has responded no!
+    'confirmed', // the tx has been included in a block.
+    'failed', // the tx failed for some reason, included on tx data.
+    'dropped', // the tx nonce was already used
+  ]
+}
+

app/scripts/controllers/transactions/nonce-tracker.js

@@ -1,7 +1,15 @@
 const EthQuery = require('ethjs-query')
 const assert = require('assert')
 const Mutex = require('await-semaphore').Mutex
-
+/**
+  @param opts {object} -
+    @property {Object} opts.provider a ethereum provider
+    @property {function} opts.getPendingTransactions a function that returns an array of txMeta
+    whos status is `submitted`
+    @property {function} opts.getConfirmedTransactions a function that returns an array of txMeta
+    whos status is `confirmed`
+  @class
+*/
 class NonceTracker {
 
   constructor ({ provider, getPendingTransactions, getConfirmedTransactions }) {
@@ -12,6 +20,9 @@ class NonceTracker {
     this.lockMap = {}
   }
 
+  /**
+    @returns {object} with the key releaseLock (the gloabl mutex)
+  */
   async getGlobalLock () {
     const globalMutex = this._lookupMutex('global')
     // await global mutex free
@@ -19,8 +30,19 @@ class NonceTracker {
     return { releaseLock }
   }
 
-  // releaseLock must be called
+  /**
-  // releaseLock must be called after adding signed tx to pending transactions (or discarding)
+  this will return an object with the `nextNonce` `nonceDetails` which is an
+  object with:
+      highestLocallyConfirmed (nonce),
+      highestSuggested (either the network nonce or the highestLocallyConfirmed nonce),
+      nextNetworkNonce (the nonce suggested by the network),
+  and the releaseLock
+  <br>note: releaseLock must be called after adding signed tx to pending transactions
+  (or discarding)<br>
+
+  @param address {string} the hex string for the address whos nonce we are calculating
+  @returns {object}
+  */
   async getNonceLock (address) {
     // await global mutex free
     await this._globalMutexFree()

app/scripts/controllers/transactions/pending-tx-tracker.js

@@ -8,10 +8,10 @@ const EthQuery = require('ethjs-query')
   As well as continues broadcast while in the pending state
 <br>
 @param config {object} - non optional configuration object consists of:
-    <br>provider
+    @property {Object} config.provider
-    <br>nonceTracker: see nonce tracker
+    @property {Object} config.nonceTracker see nonce tracker
-    <br>getPendingTransactions: a function for getting an array of transactions,
+    @property {function} config.getPendingTransactions a function for getting an array of transactions,
-    <br>publishTransaction: a async function for publishing raw transactions,
+    @property {function} config.publishTransaction a async function for publishing raw transactions,
 
 
 @class

app/scripts/controllers/transactions/tx-gas-utils.js

@@ -11,6 +11,7 @@ const SIMPLE_GAS_COST = '0x5208' // Hex for 21000, cost of a simple send.
 tx-utils are utility methods for Transaction manager
 its passed ethquery
 and used to do things like calculate gas of a tx.
+@param provider {object}
 */
 
 module.exports = class TxGasUtil {

app/scripts/controllers/transactions/tx-state-manager.js

@@ -1,22 +1,33 @@
 const extend = require('xtend')
 const EventEmitter = require('events')
 const ObservableStore = require('obs-store')
-const createId = require('../../lib/random-id')
 const ethUtil = require('ethereumjs-util')
 const txStateHistoryHelper = require('./lib/tx-state-history-helper')
-
+const createId = require('../../lib/random-id')
-// STATUS METHODS
+const { getFinalStates } = require('./lib/util')
-  // statuses:
+/**
-  //    - `'unapproved'` the user has not responded
+  TransactionStateManager is responsible for the state of a transaction and
-  //    - `'rejected'` the user has responded no!
+  storing the transaction
-  //    - `'approved'` the user has approved the tx
+  it also has some convenience methods for finding subsets of transactions
-  //    - `'signed'` the tx is signed
+  *
-  //    - `'submitted'` the tx is sent to a server
+  *STATUS METHODS
-  //    - `'confirmed'` the tx has been included in a block.
+  <br>statuses:
-  //    - `'failed'` the tx failed for some reason, included on tx data.
+  <br>   - `'unapproved'` the user has not responded
-  //    - `'dropped'` the tx nonce was already used
+  <br>   - `'rejected'` the user has responded no!
-
+  <br>   - `'approved'` the user has approved the tx
-module.exports = class TransactionStateManager extends EventEmitter {
+  <br>   - `'signed'` the tx is signed
+  <br>   - `'submitted'` the tx is sent to a server
+  <br>   - `'confirmed'` the tx has been included in a block.
+  <br>   - `'failed'` the tx failed for some reason, included on tx data.
+  <br>   - `'dropped'` the tx nonce was already used
+  @param opts {object} -
+  @property {object} opts.initState with the key transaction {array}
+  @property {number} opts.txHistoryLimit limit for how many finished
+  transactions can hang around in state
+  @property {function} opts.getNetwork return network number
+  @class
+*/
+class TransactionStateManager extends EventEmitter {
   constructor ({ initState, txHistoryLimit, getNetwork }) {
     super()
 
@@ -28,6 +39,10 @@ module.exports = class TransactionStateManager extends EventEmitter {
     this.getNetwork = getNetwork
   }
 
+  /**
+    @param opts {object} - the object to use when overwriting defaults
+    @returns {txMeta} the default txMeta object
+  */
   generateTxMeta (opts) {
     return extend({
       id: createId(),
@@ -38,17 +53,25 @@ module.exports = class TransactionStateManager extends EventEmitter {
     }, opts)
   }
 
+  /**
+    @returns {array} of txMetas that have been filtered for only the current network
+  */
   getTxList () {
     const network = this.getNetwork()
     const fullTxList = this.getFullTxList()
     return fullTxList.filter((txMeta) => txMeta.metamaskNetworkId === network)
   }
 
+  /**
+    @returns {array} of all the txMetas in store
+  */
   getFullTxList () {
     return this.store.getState().transactions
   }
 
-  // Returns the tx list
+  /**
+    @returns {array} the tx list whos status is unapproved
+  */
   getUnapprovedTxList () {
     const txList = this.getTxsByMetaData('status', 'unapproved')
     return txList.reduce((result, tx) => {
@@ -57,18 +80,35 @@ module.exports = class TransactionStateManager extends EventEmitter {
     }, {})
   }
 
+  /**
+    @param address {string} - hex prefixed address to sort the txMetas for [optional]
+    @returns {array} the tx list whos status is submitted
+  */
   getPendingTransactions (address) {
     const opts = { status: 'submitted' }
     if (address) opts.from = address
     return this.getFilteredTxList(opts)
   }
 
+  /**
+    @param address {string} - hex prefixed address to sort the txMetas for [optional]
+    @returns {array} the tx list whos status is confirmed
+  */
   getConfirmedTransactions (address) {
     const opts = { status: 'confirmed' }
     if (address) opts.from = address
     return this.getFilteredTxList(opts)
   }
 
+  /**
+    Adds the txMeta to the list of transactions in the store.
+    if the list is over txHistoryLimit it will remove a transaction that
+    is in its final state
+    it will allso add the key `history` to the txMeta with the snap shot of the original
+    object
+    @param txMeta {object}
+    @returns {object} the txMeta
+  */
   addTx (txMeta) {
     this.once(`${txMeta.id}:signed`, function (txId) {
       this.removeAllListeners(`${txMeta.id}:rejected`)
@@ -93,7 +133,7 @@ module.exports = class TransactionStateManager extends EventEmitter {
     // not tx's that are pending or unapproved
     if (txCount > txHistoryLimit - 1) {
       const index = transactions.findIndex((metaTx) => {
-        return this.getFinalStates().includes(metaTx.status)
+        return getFinalStates().includes(metaTx.status)
       })
       if (index !== -1) {
         transactions.splice(index, 1)
@@ -103,12 +143,21 @@ module.exports = class TransactionStateManager extends EventEmitter {
     this._saveTxList(transactions)
     return txMeta
   }
-  // gets tx by Id and returns it
+  /**
+    @param txId {number}
+    @returns {object} the txMeta who matches the given id if none found
+    for the network returns undefined
+  */
   getTx (txId) {
     const txMeta = this.getTxsByMetaData('id', txId)[0]
     return txMeta
   }
 
+  /**
+    updates the txMeta in the list and adds a history entry
+    @param txMeta {object} - the txMeta to update
+    @param note {string} - a not about the update for history
+  */
   updateTx (txMeta, note) {
     // validate txParams
     if (txMeta.txParams) {
@@ -136,15 +185,22 @@ module.exports = class TransactionStateManager extends EventEmitter {
   }
 
 
-  // merges txParams obj onto txData.txParams
+  /**
-  // use extend to ensure that all fields are filled
+    merges txParams obj onto txMeta.txParams
+    use extend to ensure that all fields are filled
+    @param txId {number} - the id of the txMeta
+    @param txParams {object} - the updated txParams
+  */
   updateTxParams (txId, txParams) {
     const txMeta = this.getTx(txId)
     txMeta.txParams = extend(txMeta.txParams, txParams)
     this.updateTx(txMeta, `txStateManager#updateTxParams`)
   }
 
-  // validates txParams members by type
+  /**
+    validates txParams members by type
+    @param txParams {object} - txParams to validate
+  */
   validateTxParams (txParams) {
     Object.keys(txParams).forEach((key) => {
       const value = txParams[key]
@@ -161,17 +217,18 @@ module.exports = class TransactionStateManager extends EventEmitter {
     })
   }
 
-/*
+/**
-  Takes an object of fields to search for eg:
+  @param opts {object} -  an object of fields to search for eg:<br>
-  let thingsToLookFor = {
+  let <code>thingsToLookFor = {<br>
-    to: '0x0..',
+    to: '0x0..',<br>
-    from: '0x0..',
+    from: '0x0..',<br>
-    status: 'signed',
+    status: 'signed',<br>
-    err: undefined,
+    err: undefined,<br>
-  }
+  }<br></code>
-  and returns a list of tx with all
+  @returns a {array} of txMeta with all
   options matching
-
+  */
+  /*
   ****************HINT****************
   | `err: undefined` is like looking |
   | for a tx with no err             |
@@ -192,7 +249,14 @@ module.exports = class TransactionStateManager extends EventEmitter {
     })
     return filteredTxList
   }
+  /**
 
+    @param key {string} - the key to check
+    @param value - the value your looking for
+    @param txList {array} - [optional] the list to search. default is the txList
+    from txStateManager#getTxList
+    @returns {array} a list of txMetas who matches the search params
+  */
   getTxsByMetaData (key, value, txList = this.getTxList()) {
     return txList.filter((txMeta) => {
       if (txMeta.txParams[key]) {
@@ -205,33 +269,51 @@ module.exports = class TransactionStateManager extends EventEmitter {
 
   // get::set status
 
-  // should return the status of the tx.
+  /**
+    @param txId {number} - the txMeta Id
+    @return {string} the status of the tx.
+  */
   getTxStatus (txId) {
     const txMeta = this.getTx(txId)
     return txMeta.status
   }
 
-  // should update the status of the tx to 'rejected'.
+  /**
+    should update the status of the tx to 'rejected'.
+    @param txId {number} - the txMeta Id
+  */
   setTxStatusRejected (txId) {
     this._setTxStatus(txId, 'rejected')
   }
 
-  // should update the status of the tx to 'unapproved'.
+  /**
+    should update the status of the tx to 'unapproved'.
+    @param txId {number} - the txMeta Id
+  */
   setTxStatusUnapproved (txId) {
     this._setTxStatus(txId, 'unapproved')
   }
-  // should update the status of the tx to 'approved'.
+  /**
+    should update the status of the tx to 'approved'.
+    @param txId {number} - the txMeta Id
+  */
   setTxStatusApproved (txId) {
     this._setTxStatus(txId, 'approved')
   }
 
-  // should update the status of the tx to 'signed'.
+  /**
+    should update the status of the tx to 'signed'.
+    @param txId {number} - the txMeta Id
+  */
   setTxStatusSigned (txId) {
     this._setTxStatus(txId, 'signed')
   }
 
-  // should update the status of the tx to 'submitted'.
+  /**
-  // and add a time stamp for when it was called
+    should update the status of the tx to 'submitted'.
+    and add a time stamp for when it was called
+    @param txId {number} - the txMeta Id
+  */
   setTxStatusSubmitted (txId) {
     const txMeta = this.getTx(txId)
     txMeta.submittedTime = (new Date()).getTime()
@@ -239,17 +321,29 @@ module.exports = class TransactionStateManager extends EventEmitter {
     this._setTxStatus(txId, 'submitted')
   }
 
-  // should update the status of the tx to 'confirmed'.
+  /**
+    should update the status of the tx to 'confirmed'.
+    @param txId {number} - the txMeta Id
+  */
   setTxStatusConfirmed (txId) {
     this._setTxStatus(txId, 'confirmed')
   }
 
-  // should update the status dropped
+  /**
+    should update the status of the tx to 'dropped'.
+    @param txId {number} - the txMeta Id
+  */
   setTxStatusDropped (txId) {
     this._setTxStatus(txId, 'dropped')
   }
 
 
+  /**
+    should update the status of the tx to 'failed'.
+    and put the error on the txMeta
+    @param txId {number} - the txMeta Id
+    @param err {erroObject} - error object
+  */
   setTxStatusFailed (txId, err) {
     const txMeta = this.getTx(txId)
     txMeta.err = {
@@ -260,16 +354,11 @@ module.exports = class TransactionStateManager extends EventEmitter {
     this._setTxStatus(txId, 'failed')
   }
 
-  // returns an array of states that can be considered final
+  /**
-  getFinalStates () {
+    Removes transaction from the given address for the current network
-    return [
+    from the txList
-      'rejected', // the user has responded no!
+    @param address {string} - hex string of the from address on the txParams to remove
-      'confirmed', // the tx has been included in a block.
+  */
-      'failed', // the tx failed for some reason, included on tx data.
-      'dropped', // the tx nonce was already used
-    ]
-  }
-
   wipeTransactions (address) {
     // network only tx
     const txs = this.getFullTxList()
@@ -295,6 +384,14 @@ module.exports = class TransactionStateManager extends EventEmitter {
   //    - `'confirmed'` the tx has been included in a block.
   //    - `'failed'` the tx failed for some reason, included on tx data.
   //    - `'dropped'` the tx nonce was already used
+
+  /**
+    @param txId {number} - the txMeta Id
+    @param status {string} - the status to set on the txMeta
+    @emits tx:status-update - passes txId and status
+    @emits ${txMeta.id}:finished - if it is a finished state. Passes the txMeta
+    @emits update:badge
+  */
   _setTxStatus (txId, status) {
     const txMeta = this.getTx(txId)
     txMeta.status = status
@@ -307,9 +404,14 @@ module.exports = class TransactionStateManager extends EventEmitter {
     this.emit('update:badge')
   }
 
-  // Saves the new/updated txList.
+  /**
+    Saves the new/updated txList.
+    @param transactions {array} - the list of transactions to save
+  */
   // Function is intended only for internal use
   _saveTxList (transactions) {
     this.store.updateState({ transactions })
   }
 }
+
+module.exports = TransactionStateManager