@metamask/nonce-tracker

How metamask calculates nonces

constNonceTracker=require('@metamask/nonce-tracker');constnonceTracker=newNonceTracker(config);nonceLock=nonceTracker.getNonceLock('0xselectedEthereumAddress');nonce=nonceLock.nextNonce;

NonceTracker

index.js:13-159

Parameters

• optsObject {Object}
  • opts.providerObject a ethereum provider
  • opts.getPendingTransactionsFunction a function that returns an array of txMeta whose status is submitted
  • opts.getConfirmedTransactionsFunction a function that returns an array of txMeta whose status is confirmed
  • opts.blockTracker

getGlobalLock

index.js:27-32

Returns Promise<Object> with the key releaseLock (the gloabl mutex)

getNonceLock

index.js:48-82

Parameters

• address

Properties

• highestLocallyConfirmednumber A hex string of the highest nonce on a confirmed transaction.
• nextNetworkNoncenumber The next nonce suggested by the eth_getTransactionCount method.
• highestSuggestednumber The maximum between the other two, the number returned.

this will return an object with the nextNoncenonceDetails, 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<NonceDetails>

Running tests

yarn test