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initiative/specs/001-advance-turn/tasks.md

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Tasks: Advance Turn

Input: Design documents from /specs/001-advance-turn/ Prerequisites: plan.md (required), spec.md (required)

Organization: Tasks follow the phased structure from plan.md. There is only one user story (US1 — Advance Turn, P1), so phases map directly to the plan's milestones.

Format: [ID] [P?] [Story?] Description

  • [P]: Can run in parallel (different files, no dependencies)
  • [US1]: User Story 1 — Advance Turn
  • Exact file paths included in every task

Phase 1: Setup (Milestone 1 — Tooling)

Purpose: Initialize pnpm monorepo, Biome, TypeScript, Vitest, and layer boundary enforcement

  • T001 Initialize pnpm workspace and root config — create pnpm-workspace.yaml, .nvmrc (Node 22), root package.json (with packageManager pinning pnpm 10.6 and scripts: check, test, lint, format, typecheck), biome.json, and tsconfig.base.json (strict, composite, path aliases)
  • T002 [P] Create packages/domain package skeleton — packages/domain/package.json (@initiative/domain, no deps), packages/domain/tsconfig.json (extends base, composite), empty packages/domain/src/index.ts
  • T003 [P] Create packages/application package skeleton — packages/application/package.json (@initiative/application, depends on @initiative/domain), packages/application/tsconfig.json (extends base, references domain), empty packages/application/src/index.ts
  • T004 [P] Create apps/web package skeleton — apps/web/package.json (React 19, Vite 6.2, depends on both packages), apps/web/tsconfig.json, apps/web/vite.config.ts, apps/web/index.html, apps/web/src/main.tsx, apps/web/src/App.tsx (placeholder)
  • T005 Configure Vitest — add vitest as root dev dependency, create vitest.config.ts at root (workspace mode or per-package), verify pnpm test exits 0
  • T006 Create layer boundary check — scripts/check-layer-boundaries.mjs (scans domain/application for forbidden imports) and packages/domain/src/__tests__/layer-boundaries.test.ts (wraps script as Vitest test)

Checkpoint: pnpm install succeeds, biome check . runs, tsc --build compiles, pnpm test exits 0 with layer boundary test green.

Phase 2: Domain Implementation — User Story 1: Advance Turn (Priority: P1) (Milestone 1)

Goal: Implement the complete AdvanceTurn domain logic as a pure function with all 8 acceptance scenarios and invariant tests.

Independent Test: Pure state transition — given an Encounter value and AdvanceTurn action, assert resulting Encounter and emitted domain events. No I/O, persistence, or UI needed.

  • T007 [US1] Define domain types in packages/domain/src/types.ts — CombatantId (branded/opaque), Combatant, Encounter (combatants, activeIndex, roundNumber), factory createEncounter enforcing INV-1, INV-2, INV-3
  • T008 [P] [US1] Define domain events in packages/domain/src/events.ts — TurnAdvanced, RoundAdvanced, DomainEvent union (plain data, no classes)
  • T009 [US1] Implement advanceTurn in packages/domain/src/advance-turn.ts — pure function (Encounter) => { encounter, events } | DomainError, implements FR-001 through FR-005
  • T010 [US1] Write tests for all 8 acceptance scenarios + invariants in packages/domain/src/__tests__/advance-turn.test.ts — scenarios 1–8, INV-1 through INV-5, event ordering on round wrap
  • T011 [US1] Export public API from packages/domain/src/index.ts — re-export types, events, advanceTurn, createEncounter

Checkpoint (Milestone 1): pnpm check passes (format + lint + typecheck + test + layer boundaries). All 8 scenarios + invariants green. No React/Vite imports in domain or application.

Phase 3: Application + Web Shell (Milestone 2)

Goal: Wire up the application use case and minimal React UI with a "Next Turn" button.

  • T012 Define port interface in packages/application/src/ports.ts — EncounterStore port: get(): Encounter, save(e: Encounter)
  • T013 Implement AdvanceTurnUseCase in packages/application/src/advance-turn-use-case.ts — accepts EncounterStore, calls advanceTurn, saves result, returns events
  • T014 Export public API from packages/application/src/index.ts — re-export use case and port types
  • T015 Implement useEncounter hook in apps/web/src/hooks/use-encounter.ts — in-memory EncounterStore via React state, exposes encounter state + advanceTurn action, hardcoded 3-combatant demo
  • T016 Wire up apps/web/src/App.tsx — display current combatant, round number, combatant list with active indicator, "Next Turn" button, emitted events

Checkpoint (Milestone 2): pnpm check passes. vite build succeeds. Clicking "Next Turn" cycles combatants and increments rounds correctly.

Dependencies & Execution Order

Phase Dependencies

  • Phase 1 (Setup): No dependencies — start immediately
  • Phase 2 (Domain): Depends on Phase 1 completion
  • Phase 3 (App + Web): Depends on Phase 2 completion (needs domain types and advanceTurn)

Within Phase 1

  • T001 must complete first (workspace and root config)
  • T002, T003, T004 can run in parallel [P] after T001
  • T005 depends on T001 (needs root package.json)
  • T006 depends on T002 and T005 (needs domain package + Vitest)

Within Phase 2

  • T007 must complete first (types needed by everything)
  • T008 can run in parallel [P] with T007 (events are independent types)
  • T009 depends on T007 and T008 (uses types and events)
  • T010 depends on T009 (tests the implementation)
  • T011 depends on T007, T008, T009 (exports all public API)

Within Phase 3

  • T012 first (port interface)
  • T013 depends on T012 (uses port)
  • T014 depends on T013 (exports use case)
  • T015 depends on T014 (uses application layer)
  • T016 depends on T015 (uses hook)

Parallel Opportunities

# After T001 completes:
T002, T003, T004 — all package skeletons in parallel

# After T007 starts:
T008 — domain events can be written in parallel with types

# Independent stories: only one user story (US1), so parallelism is within-phase only

Implementation Strategy

MVP First (Milestone 1)

  1. Complete Phase 1: Setup (T001–T006)
  2. Complete Phase 2: Domain (T007–T011)
  3. STOP and VALIDATE: pnpm check passes, all 8 scenarios green

Full Feature (Milestone 2)

  1. Complete Phase 3: App + Web Shell (T012–T016)
  2. VALIDATE: pnpm check passes, app runs in browser

Notes

  • All task IDs (T001–T016) match plan.md — no scope expansion
  • Single user story (US1: Advance Turn) — no cross-story dependencies
  • Tests (T010) are included as specified in plan.md and spec.md
  • Domain package must have zero React/Vite imports (enforced by T006)
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