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“Ledger Live Common” @ledgerhq/live-common

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Ledger Live Common (@ledgerhq/live-common) is a JavaScript library available via a NPM package.

This library depends on a bunch of ledgerjs packages and put together the core business logic behind Ledger Live Desktop and Ledger Live Mobile.

The stack is pretty standard for a ES6 and FlowType library. The notable dependencies are libraries like RxJS and BigNumber.js. There is also a bit of React and Redux but exposed in agnostic ways (meaning it's not mandatory to use – there will be dedicated entry point for them to offer utilities like React Hooks).

Table of Contents

• Introduction, Goals and Tradeoffs
• Getting started
  • Setup to use @ledgerhq/live-common
  • ledger-live CLI
  • tools web playground
  • mobile-test-app test project
• Learn by example
  • gist: transaction with a Ledger device
  • gist: Update firmware of a Ledger device
  • ...
• The Currency models and utilities
• The Account models and portfolio logic
• The CurrencyBridge: scan accounts with a device
• The AccountBridge: synchronize an account and perform transaction
• Hardware Wallet logic
• Apps store logic
• Firmware Update logic
• Countervalues logic
• Coin integration specifics
  • Introduction
  • Bridge implementations, where to start? (JS, Mock)
  • Implementing the hardware wallet logic of a new coin
  • The account derivation (BIP44 and exceptions)
• Advanced
  • api/socket createDeviceSocket and script runner
  • env.js: live-common configuration system
  • Serialization and reconciliation
  • cross.js and "LiveQR" protocol
  • cache.js helpers
  • Tokens management and ERC20

Developing with Ledger Live Common

• Developing setup
• The different test approaches
  • Unit test of live-common logic
  • End-to-end tests of the ledger-live command
  • Bridge dataset tests
  • Providing mocks to implement UI tests