Edwin van den Houdt
cf44bda0ce
8 template-generic skills in .claude/skills/ (new-feature, new-context, value-object, form-machine, bff-endpoint, mutation-command, ui-component, new-ssp), condensed from CLAUDE.md/ARCHITECTURE/fp-tea/ADRs and pointing at this repo's worked examples. CLAUDE.md gains a pointer. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
172 lines
10 KiB
Markdown
172 lines
10 KiB
Markdown
# CLAUDE.md
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Agent guide for this repo. The _why_ lives in `docs/ARCHITECTURE.md`,
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`docs/architecture/0001-bff-lite-decision-dtos.md`, and the learning guide
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`docs/fp-tea-atomic-design.md` (FP + The Elm Architecture + atomic design); this
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file is the _rules_. When a decision below and those docs disagree, the docs win —
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update this file.
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POC of a Dutch BIG-register self-service portal (healthcare professionals log in,
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view their registration, apply for re-registration). Angular 22, standalone,
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signals. Auth is faked; **data and business rules are served by a minimal ASP.NET
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Core backend** (`backend/`, see its README — in-memory seeded, no DB) and consumed
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through an NSwag-generated typed client. The FE renders the backend's decisions.
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## Commands
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```bash
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npm start # ng serve (proxies /api → backend) → http://localhost:4200
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npm test # vitest
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npm run lint # eslint — enforces `any`-free code + import/layer boundaries
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npm run build # ng build (must stay green)
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npm run storybook # component library by atomic layer
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npm run gen:api # regenerate the typed client from the backend OpenAPI doc
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docker compose up # run FE + backend together (Swagger at :5000/swagger)
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cd backend && dotnet test # backend rule + endpoint tests
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```
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`.npmrc` sets `legacy-peer-deps=true` (Storybook's peer range lags Angular 22).
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Do not run `npm audit fix --force` — it downgrades Angular 22→21. Dev-only
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advisories are pinned via `package.json` `overrides`; the shipped bundle audits clean.
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## The decisions (non-negotiable working agreements)
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### 1. DDD: contexts then layers, dependencies point inward
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`src/app/<context>/<layer>/`. Contexts: `shared`, `auth`, `registratie`,
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`herregistratie`, `brief` (letter-composition teaching slice), `showcase` (teaching
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page, not a feature; **sanctioned** to read every context — nothing imports it).
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| Layer | Job | Angular allowed? |
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| ----------------- | ----------------------------------------- | -------------------------------- |
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| `domain/` | business rules + data types | **No — pure TS.** Has `.spec.ts` |
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| `application/` | coordinate state/tasks (stores, commands) | yes (signals) |
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| `infrastructure/` | where data comes from (HTTP adapters) | yes (HTTP) |
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| `contracts/` | wire DTOs (the FE⇄BE seam) | no |
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| `ui/` | how it looks (components, pages) | yes |
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**Dependencies only point inward**: `ui → application → domain`; everyone may use
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`shared`; never the reverse. `ui`/`layout` never import `infrastructure` directly
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(reach data through an application store/command) — lint-enforced. Cross-context only
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`herregistratie → registratie → shared`, `auth → shared`, `brief → shared`. Imports use
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aliases as direction statements: `@shared/* @auth/* @registratie/* @herregistratie/*
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@brief/*`. `domain/` imports nothing from Angular.
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### 2. Atomic design: folder = layer
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`shared/ui` atoms → molecules → organisms; `shared/layout` templates (`shell`,
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`page-shell`); context `ui/` pages. Each level only uses levels below. A new page
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should be **composition of existing blocks** — adding building blocks is the
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exception, not the default. Atoms are thin wrappers over CIBG Huisstijl (Bootstrap 5.2)
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CSS classes (`btn`, `form-control`, `card`, …); we own only a small typed `input()` API,
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the design system does the visuals. (Where CIBG lacks a class — e.g. `alert` — the atom is a
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small hand-rolled surface built from the token bridge; see ADR-0003.)
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### 3. State: make illegal states unrepresentable
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Default reflex — **if you're about to add a second/third boolean to track state,
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model a discriminated union instead.** Three tools, all in `shared/application`:
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- **`RemoteData<E,T>`** (`remote-data.ts`) — `Loading | Empty | Failure{error} | Success{value}`.
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Combine sources with `map`/`map2`/`map3`/`andThen` (Failure > Loading > Success).
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Render it via the `<app-async>` molecule (`shared/ui/async`) — one of four
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templates, mutually exclusive by construction. Default loading spinner/skeleton
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is delay-gated (~250ms) so fast connections don't flash.
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- **Elm-style store** (`store.ts` → `createStore(initial, reduce)`) — all state in
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one Model; change only by `dispatch(msg)` → **pure** `reduce(model, msg)`. Models
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are tagged unions (see `herregistratie.machine.ts`, `intake.machine.ts`). Templates
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send messages, never mutate.
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- **`Result<E,T>` + value objects** ("parse, don't validate") — raw input becomes a
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branded type only via a parser returning `Result` (`registratie/domain/value-objects/`:
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`Postcode`, `Uren`, `BigNummer`). Once you hold the type, never re-check it.
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**Derive, don't store** what you can compute — e.g. the wizard's visible steps are
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`visibleSteps(answers)`, not a stored field (`intake.machine.ts`).
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**Side effects stay out of the reducer.** A _command_ (`application/submit-*.ts`)
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does the HTTP, then dispatches a message describing the outcome. Reducer = "what the
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new state is"; command = "go do it, then say what happened."
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**Shared cross-page state = one root singleton.** Stores are `providedIn: 'root'`
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(`BigProfileStore`, `SessionStore`). That single instance is the shared state — no
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NgRx, no extra lib. Optimistic update pattern: `begin*` (flip pending) →
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`confirm*` (clear + `resource.reload()`) / `rollback*` (undo).
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### 4. BFF-lite + decision DTOs (ADR-0001)
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`infrastructure/` is the **only** layer that touches the network — the
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anti-corruption boundary. Each screen gets one screen-shaped endpoint returning a
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decision-enriched DTO; **the FE renders decisions, it does not recompute business
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rules.** Per rule, pick: _decision flag_ (server computes the boolean — e.g.
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herregistratie eligibility) or _config value_ (server sends threshold, FE applies
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for instant feedback, server re-validates as authority — e.g. scholing threshold).
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FE keeps only **format** validation, never as authority.
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DTO lives in `contracts/`; a hand-written `parse*`/`toDomain` in `infrastructure/`
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validates the untrusted shape and maps DTO → domain. Wiring a real .NET backend
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touches only `infrastructure/` + `contracts/` (see ARCHITECTURE §6). Server-owned
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rules stay in `domain/*.policy.ts` as reference impl + unit test, marked server-owned,
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but the FE doesn't call them.
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### 5. Testing
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Vitest. Co-locate `*.spec.ts` next to the unit. **Domain and pure logic must have a
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spec** (reducers, combinators, `visibleSteps`, parsers, boundary `parse*` adapters).
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Test the pure function directly — no Angular TestBed for domain. UI is exercised via
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Storybook stories (`*.stories.ts` co-located, titled `Layer/Name`, a11y addon on),
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not heavy component tests.
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## Conventions
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- Standalone components only; no NgModules. Signal inputs (`input()`), `inject()` over
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constructor DI (constructor only for `effect()`/template-ref injection).
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- Angular-native control flow `@if/@for`; fetch via `resource({ loader })` over the
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generated `ApiClient` inside an `infrastructure/*.adapter.ts` (one place HTTP lives),
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with a `parse*` boundary; `withViewTransitions()` for page transitions (header/footer
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have stable `view-transition-name`, excluded from the fade).
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- **Naming:** shared/reusable UI is **English** (language-agnostic: `button`,
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`wizard-shell`); domain contexts are **Dutch** (`registratie`, `herregistratie`,
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`*.machine.ts`). Pick the language by which side of the seam the code is on.
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- **User-facing copy = `$localize`.** Every user-visible string is wrapped in Angular's
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first-party `$localize` (no third-party i18n lib), with a stable custom id
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(`` $localize`:@@context.key:Tekst` ``). Source locale is `nl`; a second locale is a
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translation file, not a code change (the seam). Shared/English components must **not**
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hardcode Dutch — expose copy as `input()`s with localizable defaults; the domain caller
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supplies the text (see `shared/ui/async`). Format-validation messages in
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`domain/value-objects/` stay co-located but are still `$localize`-wrapped.
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- **Forms = one idiom.** Any form with validation or submission uses a `*.machine.ts`
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(Model/Msg/reduce) + value objects + a `submit-*` command returning `Result` — the
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same shape as the wizards, whether it's one step or many. Don't hand-roll mutable
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fields + ad-hoc error signals.
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- Routes: lazy `loadComponent`, persistent `ShellComponent` parent, `canActivate:
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[authGuard]` on protected routes (`app.routes.ts`).
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- Theming: CIBG Huisstijl (a customized Bootstrap 5.2 build) is vendored under
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`public/cibg-huisstijl/` and loaded via a `<link>` in `index.html`; `src/styles.scss` holds a
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**token bridge** mapping the app's `--rhc-*` token vocabulary onto CIBG/`--bs-*` values (so
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components keep referencing tokens). System-font stack (licensed RO/Rijks fonts not shipped). See ADR-0003.
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- Scenario toggle (**dev-only**, not wired in prod builds): `?scenario=slow|loading|empty|error`
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on data pages (`scenario.interceptor.ts`) to see every async state.
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- Prettier; `.editorconfig`. tsconfig: `noImplicitReturns`,
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`noPropertyAccessFromIndexSignature`, `noFallthroughCasesInSwitch`, `isolatedModules`.
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- **Enforced, not just hoped-for:** `npm run lint` (`eslint.config.mjs`) fails the build
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on `any` and on illegal imports — `domain/` importing Angular, or a context importing
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"upward" (the `herregistratie → registratie → shared`, `auth → shared` direction).
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CI (`.github/workflows/ci.yml`) runs lint + `check:tokens` + test + build, backend
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`dotnet test`, and an API-client drift check.
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## Adding a feature (recipe)
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Domain first (types + pure rules + spec, no Angular) → infrastructure (adapter:
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`httpResource` or command returning `Result`) → application (store if shared state;
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union + pure reduce) → UI last (compose `shared/ui` atoms, wrap async in `<app-async>`,
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dispatch messages). Worked example: the intake wizard (`herregistratie/`).
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The recipes are also invocable skills in `.claude/skills/`: `new-feature`,
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`new-context`, `value-object`, `form-machine`, `bff-endpoint`, `mutation-command`,
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`ui-component`, `new-ssp` (bootstrap a new portal from this template).
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## Out of scope (POC, don't build unprompted)
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Real auth/DigiD, NgRx, licensed RO/Rijks fonts + logo (system-font stack; text wordmark),
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runtime DTO validation on every endpoint, multi-tab session sync.
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