SKILL.md
Leather Monorepo Navigation
This is a Turborepo monorepo with 3 apps and packages organized in a CLEAN architecture.
Architecture Layers
Presentation → apps/, @leather.io/ui, @leather.io/features, @leather.io/provider Application → @leather.io/queries, @leather.io/services, @leather.io/rpc, @leather.io/sdk, @leather.io/cms Domain → @leather.io/models, @leather.io/bitcoin, @leather.io/stacks State → @leather.io/state (Redux Toolkit) Foundation → @leather.io/utils, @leather.io/constants, @leather.io/tokens, @leather.io/crypto, @leather.io/analytics
Apps
| App | Path | Purpose |
|---|---|---|
| extension | apps/extension/ |
Chrome/Firefox browser extension |
| mobile | apps/mobile/ |
React Native iOS/Android app (Expo) |
| web | apps/web/ |
React Router web app at app.leather.io |
Domain Layer Packages
| Package | Path | Scope |
|---|---|---|
@leather.io/models |
packages/models/ |
Domain types and interfaces |
@leather.io/bitcoin |
packages/bitcoin/ |
Bitcoin protocol utilities, address handling, PSBTs |
@leather.io/stacks |
packages/stacks/ |
Stacks protocol utilities, transactions |
Import rules for domain peers:
- All three can import types from each other
bitcoin/stacksshould NOT import logic frommodels(only types)
Application Layer Packages
| Package | Path | Scope |
|---|---|---|
@leather.io/services |
packages/services/ |
Orchestration only — API calls, DI, caching, multi-service coordination |
@leather.io/queries |
packages/queries/ |
React Query configurations |
@leather.io/query |
packages/query/ |
Legacy query package (migrate to @leather.io/queries) |
@leather.io/rpc |
packages/rpc/ |
RPC client abstraction |
@leather.io/sdk |
packages/sdk/ |
SDK utilities |
@leather.io/cms |
packages/cms/ |
CMS integration |
Services should NOT contain:
- Pure domain logic (move to
models,bitcoin, orstacks) - Utility functions (move to
utils)
State Management
| Package | Path | Scope |
|---|---|---|
@leather.io/state |
packages/state/ |
Shared Redux Toolkit slices (wallet, keychains) |
App-specific state:
- Extension:
apps/extension/src/app/store/—{feature}.slice.tsconvention - Mobile:
apps/mobile/src/store/—{feature}.write.ts(slice + actions) and{feature}.read.ts(selectors + hooks)
Foundation Packages
| Package | Path | Scope |
|---|---|---|
@leather.io/utils |
packages/utils/ |
Generic utilities (money, formatting, guards) |
@leather.io/constants |
packages/constants/ |
Shared constants, currency decimals |
@leather.io/crypto |
packages/crypto/ |
Cryptographic primitives, key derivation |
@leather.io/tokens |
packages/tokens/ |
Token metadata |
@leather.io/analytics |
packages/analytics/ |
Mixpanel analytics |
Presentation Layer Packages
| Package | Path | Scope |
|---|---|---|
@leather.io/ui |
packages/ui/ |
Shared UI components (React) |
@leather.io/features |
packages/features/ |
View models, UI transforms |
@leather.io/provider |
packages/provider/ |
App provider utilities |
Decision Tree: Where Does New Code Go?
Is it PURE business logic (no I/O, no async, no side effects)?
├─ Yes → Is it chain-specific protocol code?
│ ├─ Bitcoin protocol → packages/bitcoin/src/
│ ├─ Stacks protocol → packages/stacks/src/
│ └─ No → packages/models/src/
│
Is it orchestration (API calls, DI, caching, coordination)?
├─ Yes → packages/services/src/{domain}/
│
Is it a domain type/interface?
├─ Yes → packages/models/src/
│
Is it a generic utility (not domain-specific)?
├─ Yes → packages/utils/src/
│
Is it a UI component?
├─ Yes → packages/ui/src/components/
│
Is it React Query configuration?
├─ Yes → packages/queries/src/
│
Is it app-specific?
└─ Yes → apps/{app}/src/Key Conventions
- Barrel exports: Each package has
src/index.tsexporting public API - Internal imports: Use
@leather.io/{package}not relative paths across packages - Co-located tests:
{file}.spec.tsnext to source file - Kebab-case filenames:
bitcoin-address.tsnotbitcoinAddress.ts - Platform suffixes:
.web.tsx,.native.tsx,.shared.tsfor cross-platform code
Common Tasks
Adding a Bitcoin protocol utility
packages/bitcoin/src/utils/{feature-name}.ts
packages/bitcoin/src/utils/{feature-name}.spec.tsExport from packages/bitcoin/src/utils/index.ts
Adding a domain type
packages/models/src/{area}.model.tsAdding orchestration logic
packages/services/src/{domain}/{domain}.service.tsShould only contain: API calls, DI, caching, multi-service coordination
Adding a UI component
packages/ui/src/components/{component-name}/
├─ {component-name}.tsx
├─ {component-name}.web.tsx (if platform-specific)
└─ index.ts