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Web3 Redux

This is the main Redux library that is meant to abstract state management regardless of the used UI Framework.


The project is built in Typescript and is transpiled to JS using esbuild. When developing we recommend building in watch mode which you can do using the command below.

cd packages/web3-redux
npm run build:watch

Project Layout

At the top level of our packages/web3-redux/src/ folder we have the following directory structure. You'll notice these are mostly organized by data model, where each folder contains all the logic to process a specific type of blockchain data or API data. Some important folders include:

  • crud/createCRUDModel.ts: General CRUD model factory function, this is the base for all data models for generic CREATE, READ, UPDATE, DELETE operations. Creates basic actions, sagas, hooks, and selectors used by all data models.
  • db.ts: Dexie.js IndexedDB persistent state
  • orm.ts: Redux-Orm in-memory state
  • store.ts: Redux store combing reducers, sagas, and other middleware
┣ 📜all.sol #Export relevant OpenZeppelin contracts (ERC20,ERC721,ERC1155,ERC165)
┣ 📂4byte API store sha-256 pre-images for events/function calls
┣ 📂abis #Import for artifacts & typechain types
┣ 📂artifacts #(generated) Artifacts for common contracts (ERC20,ERC721,ERC1155,ERC165)
┣ 📂block #Ethereum Block
┣ 📂config #Global Config (current account, IPFS url)
┣ 📂contract #Smart Contract or Externally Owned Account with an Ethereum address
┣ 📂contractevent #Smart Contract event log
┣ 📂contracteventquery #Cache event log queries across block ranges
┣ 📂contractsend #Smart Contract send signed transaction
┣ 📂crud #Generic CRUD Model
┣ 📂error #Store Redux Errors
┣ 📂ethcall #Ethereum Call
┣ 📂ipfs #IPFS read/write
┣ 📂network #Network configs, store web3 instance
┣ 📂sync #Dynamic Sync middleware. Quickly add logic to dispatch actions if a new Block/Event/Transaction matching filter parameters is detected.
┣ 📂test #Test data
┗📜mochaHooks.ts #Mocha hooks beforeAll, afterAll
┣ 📂transaction #Ethereum Transaction
┣ 📂typechain #(generated) Typechain types for common contracts (ERC20,ERC721,ERC1155,ERC165)
┣ 📂types #Typescript type annotations
┣ 📂utils #Utility functions
┣ 📜db.ts #Dexie.js IndexedDB persistent state
┣ 📜environment.ts #Environment variables and their defaults
┣ 📜index.ts #Root export all modules
┣ 📜orm.ts #Redux-Orm in-memory state
┣ 📜reducer.ts #Root reducer, dispatches reducer actions to corresponding model reducers
┣ 📜saga.ts #Root saga, spawns model root sagas
┣ 📜state.ts #redux-orm state interface, used for certain tests and give a high-level overview of the Redux store since redux-orm does not have tyypes
┗ 📜store.ts #default redux store and redux store factory functions, compose with custom reducers to integrate web3-redux to existing store

Data Models

Most of the model directories (block, transaction, contract...) then have the following structure:

┣ 📂actions #Custom Redux actions
┣ 📂hooks #Custom React hooks
┣ 📂middleware #Redux middleware
┣ 📂model #Define the model interface and any other utilities such as validation
┣📜interface.ts #Define model interface, Dexie indices
┣📜orm.ts #Define Redux-ORM Class
┗📜validate.ts #Define validation logic (sometimes included in interface.ts)
┣ 📂sagas #Custom Sagas (eg. RPC requests)
┣ 📂selectors #Custom Redux selectors
┣ 📜crud.ts #Basic CRUD model created using factory createCRUDModel()
┗ 📜index.ts #Export all modules (actions, sagas, hooks, selectors)


We use the following libraries for testing:

  • mocha As a testing framework. Our .mocharc.json file is configured to run tests in parallel on 8 processes.
  • chai As an test assertion library

Common actions in the before() or beforeEach() step of test suites include:

  • Setting up the store
  • Dispatching actions to the store to populate with test data (eg. Configure Network)
  • Setting up a ganache-core test Web3 provider (test blockchain)
  • Deploying test smart contracts (eg. Deploy ERC20 contract)

When running tests we recommend the following best practices:

  • Run individual test files with mocha lib/<path-to-file>
  • Run tests with event logging middleware LOG_REDUX_ACTIONS=1 mocha lib/<path-to-file>
  • If a test files contains many unit tests consider temporarily skipping sum by refactoring them to use it.skip('MyTest, () => ...). Mocha will the test description but won't execute the test.

Testing Hooks web3-redux supports React hooks to simplify integration with React components. These are NOT required however, and other non-React projects can still integrate all of the other Redux-based features for state management (actions, sagas, selectors). Testing React Hooks requires introducing additional libraries to simulate the DOM and how hooks update: