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# `@metamask/nonce-tracker`

How metamask calculates nonces

```js
const NonceTracker = require('@metamask/nonce-tracker');

const nonceTracker = new NonceTracker(config);

nonceLock = nonceTracker.getNonceLock('0xselectedEthereumAddress');

nonce = nonceLock.nextNonce;
```

## NonceTracker

[index.js:13-159][13]

### Parameters

- `opts` **[Object][14]** {Object}
  - `opts.provider` **[Object][14]** a ethereum provider
  - `opts.getPendingTransactions` **[Function][15]** a function that returns an array of txMeta
    whose status is `submitted`
  - `opts.getConfirmedTransactions` **[Function][15]** a function that returns an array of txMeta
    whose status is `confirmed`
  - `opts.blockTracker`

### getGlobalLock

[index.js:27-32][16]

Returns **[Promise][17]&lt;[Object][14]>** with the key releaseLock (the gloabl mutex)

### getNonceLock

[index.js:48-82][18]

#### Parameters

- `address`

#### Properties

- `highestLocallyConfirmed` **[number][19]** A hex string of the highest nonce on a confirmed transaction.
- `nextNetworkNonce` **[number][19]** The next nonce suggested by the eth_getTransactionCount method.
- `highestSuggested` **[number][19]** The maximum between the other two, the number returned.

this will return an object with the `nextNonce` `nonceDetails`, and the releaseLock
Note: releaseLock must be called after adding a signed tx to pending transactions (or discarding).

#### Parameters

- `address` {string} the hex string for the address whose nonce we are calculating

Returns **[Promise][17]&lt;NonceDetails>**

## Running tests

```bash
yarn test
```

[13]: https://github.com/MetaMask/nonce-tracker/blob/587ee0b25e16543330830e71372e0a9b94c166c4/index.js#L13-L159 'Source code on GitHub'
[14]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
[15]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function
[16]: https://github.com/MetaMask/nonce-tracker/blob/587ee0b25e16543330830e71372e0a9b94c166c4/index.js#L27-L32 'Source code on GitHub'
[17]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise
[18]: https://github.com/MetaMask/nonce-tracker/blob/587ee0b25e16543330830e71372e0a9b94c166c4/index.js#L48-L82 'Source code on GitHub'
[19]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number

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