- client/ — main application clients, deployed as single-page React apps.
- packages/ — shared libraries across clients.
- apps/ — standalone mini-apps, deployed separately.
- Calypso — the classic WordPress.com hosting dashboard, sharing data using Redux and split via Webpack section chunks.
- client/my-sites — per-site management; deprecated in favor of the Dashboard client
- client/my-sites/checkout — checkout flow
- client/me/purchases — purchase management
- client/landing/stepper — onboarding/signup flows (site creation, domain purchase, migration wizards)
- client/reader — WordPress.com Reader: feed streams, discover, conversations, likes, lists, following management
- Shared infra: client/components, client/state, client/lib, client/layout
- Jetpack Cloud (client/jetpack-cloud) — reuses Calypso shared infra (client/state, client/components).
- A8C for Agencies (client/a8c-for-agencies) — reuses Calypso shared infra.
- Dashboard (client/dashboard) — the new multi-site dashboard. Self-contained: does not reuse Calypso client code. Has its own components, data fetching (TanStack Query), and routing (TanStack Router).
- client/dashboard/me/billing-purchases — billing & purchase management
- Help Center (
packages/help-center) — shared component library for WordPress.com support. Also deployed viaapps/help-center/towidgets.wp.com. - Image Studio (
packages/image-studio) — AI-powered image editing and generation - Block Notes (
packages/block-notes) — AI-powered block commenting system for WordPress
- Help Center (
apps/help-center) — build/deploy layer that bundlespackages/help-centerinto webpack entry points served fromwidgets.wp.com.
# Setup
yarn install
# Build and start the dev server
yarn start
# Build and start the dev server for the Dashboard client only.
yarn start-dashboardNote: E2E tests require a local Calypso development instance to be running.
# JavaScript tests
yarn test # Run unit tests for client, packages, server, and build-tools
yarn test-build-tools # Run unit tests for build-tools
yarn test-client # Run unit tests for client
yarn test-integration # Run integration tests
yarn test-apps # Run apps unit tests
yarn test-packages # Run packages unit tests
yarn test-server # Run server unit tests
yarn test-server:coverage # Run server unit tests with coverage info
yarn test-client:watch # Run unit tests for client in watch mode
yarn test-client <path_to_test_directory> # Run client unit tests from a specific directory
yarn test-client --testNamePattern="<TestName>" # Run a specific client unit test
# E2E tests - refer to: test/e2e/AGENTS.md
# Code Quality
yarn lint # Lint everything
yarn lint:css # Lint CSS
yarn lint:js # Lint JavaScript
yarn reformat-files # Fix formatting with Prettier- Create PRs as draft. Follow the template in .github/PULL_REQUEST_TEMPLATE.md.
- Follow the branch naming conventions in docs/git-workflow.md.
- In the PR description:
- Use Linear issue IDs (e.g.,
LIN-123) instead of full Linear URLs. - Avoid mentioning people's names.
- Do not link to wordpress.com URLs.
- Include all checklist items from .github/PULL_REQUEST_TEMPLATE.md. Only mark items as completed (
[x]) if they actually apply; leave inapplicable items unchecked ([ ]).
- Use Linear issue IDs (e.g.,