46 lines
2 KiB
Markdown
46 lines
2 KiB
Markdown
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# Lit reference adapter
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Projects the technology-neutral IR (`ir/`) onto the Lit stack. This is the
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**reference** adapter — the contract every stack adapter implements lives in
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[`adapters/ADAPTER_CONTRACT.md`](../ADAPTER_CONTRACT.md).
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Run it with **`make adapt-lit`** (`adapters/lit/adapt.mjs`).
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## What it does
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Per the contract, an adapter is **scaffold + drift-detect**, never a rewrite:
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| Concern | Behaviour | Status |
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|---|---|---|
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| **Tokens** | **Fully generated** from `ir/tokens.json` into the `:root` block of `src/styles/colors_and_type.css`, between `@generated tokens` markers. Deterministic — re-running with an unchanged IR is a byte-identical no-op. The hand-authored type/utility CSS after the block is preserved. | **done (T06)** |
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| **New component** | Generate a `<wn-*>` Lit stub from the IR contract's prop→attribute map + a behaviour `TODO`. | T07 |
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| **Changed component** | Emit a **drift report** (`adapters/lit/drift/<Name>.md`) — never overwrite the hand-authored element. | T07 |
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## Directionality
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One-way: **React → `ir/` → Lit**. This adapter is downstream of the IR; it never
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writes back to `ir/` or to the React designbook. A change to the shared language is
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made in Claude Design and re-propagated (`make designbook-pull && make ir &&
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make adapt-lit`). See `.claude/rules/designbook-propagation.md`.
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## Token regeneration is a visual change
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Because tokens are fully generated, regenerating them can change rendered
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appearance when the canonical React designbook has moved (e.g. a font-stack or
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colour change). That makes the Playwright baselines diverge **by design** — it is a
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human review point, not an error:
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```
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make adapt-lit # regenerates tokens
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pnpm test:visual # will fail where appearance changed
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# review the change, then if correct:
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pnpm test:visual:update # accept new baselines
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```
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Never run `test:visual:update` to silence a token change without reviewing it — that
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defeats the parity gate (T08).
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## Exit codes
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`0` ok · `2` usage/config · `3` drift detected · `4` parity failure · `5` internal.
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