mosaic

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Work on Mosaic UI: styling a component with slot recipes (`defineSlotRecipe` / `useRecipe` / slots / variants), or building a flow — authoring a state machine…

npx skills add https://github.com/clerk/javascript --skill mosaic

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Mosaic UI

Two things live under Mosaic, and this skill covers the how-to for both:

Styled components are authored with StyleX — stylex.create declares the styles, themeProps emits the part's public identity (the .cl-<slot> class plus data-<axis> attrs), and mergeStyleProps fuses the two with the consumer's className/style.
Flows follow a machine → controller → view split that keeps Clerk resource logic out of visual components and makes behavior testable without a running Clerk app:

machine     Pure flow rules: states, events, guards, async invokes, errors.
            No React hooks. No Clerk hooks. No Clerk resource objects.

controller  Clerk/data adapter: reads Clerk hooks/resources, injects async
            effects into machine context, gates permissions, derives view props.
            The only layer that may import Clerk hooks or call resource methods.

view        Rendering only: receives a snapshot plus explicit props, renders UI,
            sends events. No Clerk imports. No data-fetching. No mutations.

references/mosaic-architecture.md (repo root, read by all agents) is the canonical contract for the whole design system — the --cl-* tokens, the .cl-<slot> + data-<axis> styling API, the CSS build, and the "Flow and data architecture" section that defines the split. Read it for the what; this skill is the how-to.

Which reference to read

You are…	Read
Building on / authoring a headless primitive (`@clerk/headless`)	`references/headless.md`
Styling a component (tokens, `stylex.create`, `themeProps`, CSS build)	`references/stylex.md`
Building an enter/exit transition, or any motion that reads as wrong	`references/motion.md`
Authoring or debugging a state machine, or wiring one to React	`references/machines.md` → in-tree `machine/README.md`
Writing the controller (Clerk adapter, permissions, revalidate)	`references/controllers.md`
Writing the view (rendering a snapshot, sending events)	`references/views.md`
Testing a machine, controller, or view	`references/testing.md`
Migrating a legacy component into Mosaic (the end-to-end workflow)	`references/migration.md`
Running the parity audit that guards a migration	`references/parity-audit.md`

The migration workflow (migration.md) ties the flow references together: it treats the legacy component as the spec and drives you through the machine, controller, and view layers, then verifies parity with parity-audit.md.