Pulsar Core

The core, framework-agnostic engine for real-time tracking of Web3 transaction lifecycles (pending, success, failed, replaced).

🏛️ What is @tuwaio/pulsar-core?

@tuwaio/pulsar-core is the central nervous system of the Pulsar ecosystem. It is a headless and framework-agnostic library, meaning it contains no UI components or framework-specific code (like React hooks).

Its sole purpose is to provide a powerful state machine for managing multi-chain transactions, built on top of Zustand (for state management) and Immer (for immutable updates). Think of it as a pre-configured, extensible "brain" that you can integrate into any JavaScript or TypeScript application to handle complex transaction tracking logic with ease.

This package exports one primary factory function: createPulsarStore.

✨ Key Features

• Framework-Agnostic: Use it with React, Vue, Svelte, or even in a Node.js environment.
• Multi-Chain by Design: Built to handle different blockchain architectures via a powerful adapter system.
• Persistent State: Automatically saves transaction state to localStorage, allowing tracking to resume after a page refresh.
• Extensible: Customize its behavior with adapters, callbacks, and custom trackers.
• Type-Safe: Written entirely in TypeScript for a robust developer experience.

💾 Installation

This package requires zustand, immer and dayjs as peer dependencies. You must install them alongside @tuwaio/pulsar-core.

# Using pnpm (recommended), but you can use npm, yarn or bun as well
pnpm add @tuwaio/pulsar-core @tuwaio/orbit-core zustand immer dayjs

🚀 API & Usage

createPulsarStore(config)

This is the main factory function that creates your transaction store. It takes a configuration object and returns a fully typed, ready-to-use vanilla Zustand store.

Configuration Example

import { createBoundedUseStore, createPulsarStore, Transaction } from '@tuwaio/pulsar-core';
import { pulsarEvmAdapter } from '@tuwaio/pulsar-evm';

import { appChains, config } from '@/configs/wagmiConfig';

const storageName = 'transactions-tracking-storage';

export enum TxType {
  example = 'example',
}

type ExampleTx = Transaction & {
  type: TxType.example;
  payload: {
    value: number;
  };
};

export type TransactionUnion = ExampleTx;

export const usePulsarStore = createBoundedUseStore(
  createPulsarStore<TransactionUnion>({
    name: storageName,
    adapter: pulsarEvmAdapter(config, appChains),
    maxTransactions: 100, // Optional: defaults to 50
  }),
);

Transaction Pool Management (FIFO)

To prevent the localStorage from growing indefinitely, Pulsar Core implements a FIFO (First-In, First-Out) Eviction Policy.

• Maximum Transactions: By default, the store keeps the last 50 transactions. You can customize this via the maxTransactions property in the createPulsarStore config.
• Eviction Process: When the pool exceeds the maxTransactions limit, the oldest transaction (based on localTimestamp) is automatically removed from the state and storage when a new one is added.

The Returned Store API

The createPulsarStore function returns a vanilla Zustand store with the following state and actions:

State

• transactionsPool: Record<string, T>: The primary state object. This is a map of all tracked transactions, where the key is the transaction's unique txKey (e.g., a transaction hash).
• initialTx?: InitialTransaction: Holds the state of a transaction that is currently being initiated (e.g., waiting for a user's signature) but is not yet submitted to the network. Useful for providing instant UI feedback.
• lastAddedTxKey?: string: The txKey of the most recently added transaction.

Actions

• executeTxAction(params): The primary, all-in-one function for initiating, sending, and tracking a new transaction. This is the main action you will use.
• initializeTransactionsPool(): An async function to re-initialize trackers for any pending transactions found in storage. This is crucial for resuming tracking after a page reload.
• addTxToPool(tx): Adds a new transaction directly to the tracking pool.
• updateTxParams(txKey, fields): Updates one or more properties of an existing transaction in the pool.
• removeTxFromPool(txKey): Removes a transaction from the pool by its key.
• closeTxTrackedModal(txKey?): A helper to manage UI state, which sets isTrackedModalOpen to false and clears the initialTx state.
• getLastTxKey(): Returns the txKey of the most recently added transaction.

Selectors

The package also provides a set of selector functions to help you efficiently query the transaction pool:

• selectAllTransactions(pool): Returns all transactions sorted chronologically.
• selectPendingTransactions(pool): Returns only transactions that are currently pending.
• selectTxByKey(pool, txKey): Retrieves a specific transaction by its key.
• selectAllTransactionsByActiveWallet(pool, address): Returns all transactions for a specific wallet.
• selectPendingTransactionsByActiveWallet(pool, address): Returns pending transactions for a specific wallet.

🛠️ Advanced Usage: initializePollingTracker

For custom tracking requirements (like server-side tracking or non-standard APIs), you can use the low-level initializePollingTracker utility. This is the same engine used internally by Pulsar adapters for Gelato, Safe, and Solana.

import { initializePollingTracker } from '@tuwaio/pulsar-core';

await initializePollingTracker({
  tx: myTransaction,
  fetcher: async ({ stopPolling, onSuccess, onFailure }) => {
    const status = await checkMyCustomApi(myTransaction.txKey);
    if (status === 'done') onSuccess(status);
    if (status === 'error') onFailure(status);
  },
  onSuccess: (status) => console.log('Success!', status),
  onFailure: (status) => console.error('Failed!', status),
});

✨ How It Connects to the Ecosystem

Pulsar is a modular ecosystem. Here’s how the pieces fit together:

• @tuwaio/pulsar-core: Provides the generic, headless state machine (createPulsarStore). It knows how to manage state but doesn't know anything about specific blockchains.
• @tuwaio/pulsar-evm: An adapter that plugs into the adapters config. It teaches the core store how to interact with EVM chains (e.g., how to check transaction receipts, get wallet info from Wagmi, etc.).
• @tuwaio/pulsar-solana: An adapter that plugs into the adapters config. It extends the core store to work with the Solana ecosystem, teaching it how to track transactions, get wallet info from @wallet-ui/react, and use Solana RPCs.
• @tuwaio/pulsar-react: Provides React bindings and hooks (like useInitializeTransactionsPool) to easily connect the Pulsar store to your React application's lifecycle.

🤝 Contributing & Support

Contributions are welcome! Please read our main Contribution Guidelines.

If you find this library useful, please consider supporting its development. Every contribution helps!

➡️ View Support Options

📄 License

This project is licensed under the Apache-2.0 License - see the LICENSE file for details.