Packages

The packages/ directory hosts every shared workspace in the monorepo. Most are first-class workspaces (packages/<name>); a few are conceptual umbrellas (packages/embeds/, packages/platform/, packages/features/, packages/app-store/) that contain many sub-packages.

Catalog

Package	Purpose	Page
features	70+ domain modules — the business-logic layer	features
lib	Shared utilities (CalendarService, CalEventParser, crypto, dayjs, ssrfProtection, getIP, getSafeRedirectUrl, ...)	lib
ui	Shared design system (~50 components)	ui
prisma	Database schema, migrations, seeds, generated types	prisma
trpc	Type-safe API server + client	trpc
app-store	111 third-party integrations	app-store
app-store-cli	Code generator that wires apps in app-store	(covered in app-store)
embeds/embed-core + embed-react + embed-snippet	JS, React, and snippet embed runtimes	embeds
platform/atoms + libraries + types + examples	Cal.com Platform SDK	platform
emails	Transactional email templates (React Email)	emails
dayjs	Pre-configured Day.js bundle	misc
i18n	next-i18next locale bundles	misc
kysely	Generated Kysely types from Prisma	misc
sms	SMS providers (Twilio, etc.)	misc
types	Shared TypeScript types (Calendar, Booking, ...)	misc
tsconfig	Shared tsconfig presets	misc
testing	Test fixtures + booking scenario builder	misc
debugging	Logger and troubleshooter helpers	misc
di	Lightweight DI container helpers	misc
coss-ui	UI tokens / component primitives shared with the marketing site	misc
config	Shared runtime config helpers	misc
redis (under features)	Redis client wrappers	features

Layering

graph BT
    Prisma[prisma] --> Lib[lib]
    Prisma --> Types[types]
    Prisma --> Kysely[kysely]
    Lib --> UI[ui]
    Lib --> Features[features/*]
    Types --> Features
    UI --> Features
    Features --> TRPC[trpc]
    Features --> Web[apps/web]
    TRPC --> Web
    Features --> AppStore[app-store/*]
    AppStore --> Features
    PlatformLibs[platform/libraries] --> Features
    PlatformLibs --> TRPC
    PlatformLibs --> ApiV2[apps/api/v2]
    Features --> Embeds[embeds/*]

The general rule: prisma and types are the lowest layer; lib builds on them; features builds on lib/ui/prisma; apps consume features. Cycles are avoided by routing API-v2 imports through packages/platform/libraries.

Pages

• features
• lib
• ui
• prisma
• trpc
• app-store
• embeds
• platform
• emails
• misc