docs(02-01): complete foundations plan
- 02-01-foundations-SUMMARY.md authored with frontmatter dependency graph, key-files manifest, decisions log, patterns established, test-count breakdown (72 new tests), TICK_MS=200 (no drift), and ESLint sim-purity rule landed (defended-option clause did not trigger) - STATE.md: Phase 2 progress 1/5 plans (Wave 0 complete); velocity table updated with Plan 02-01 ~12min entry; decisions log cites BLOCKER 3 split, V1Payload extension, ESLint rule - ROADMAP.md: Phase 2 row updated to 1/5; 02-01 plan marked [x] with duration + summary backlink - REQUIREMENTS.md: CORE-02, CORE-03, CORE-11, UX-10, UX-11 marked complete with annotations; traceability table updated Plan execution metrics: - 3 atomic commits (58db532,fe99058,2a8d354) - 72 new tests across 9 test files (cushion above plan estimate of 54) - Total test count: 128/128 green - npm run ci exits 0 - Duration: ~12 min (sequential mode)
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---
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phase: 02-season-1-vertical-slice-soil
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plan: 01
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subsystem: foundations
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tags: [foundations, scheduler, big-qty, zustand, save-extension, eslint-firewall, mvp, blocker-3]
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# Dependency graph
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requires:
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- phase: 01
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provides: Plan 01-01 scaffolded src/sim/ + src/store/ + src/save/ firewall directories; Plan 01-02 landed eslint.config.js with the CORE-10 firewall rule and the __test_violation__ programmatic-ESLint test pattern; Plan 01-03 shipped the save envelope + migrate() chain + V1Payload v1 shape this plan extends in place
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provides:
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- BigQty immutable wrapper around break_eternity.js Decimal (D-31) — every arithmetic op returns a new instance; toJSON/fromJSON canonical-string round-trip
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- formatHumanReadable for K/M/B/T/scientific HUD readouts (UX-11)
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- Clock interface + wallClock + FakeClock — only file in src/sim/ allowed to read Date.now() (D-33)
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- drainTicks fixed-timestep accumulator (CORE-02): refuses negative deltas (CORE-11), clamps at MAX_OFFLINE_MS=24h (CORE-03), TICK_MS=200 (5Hz)
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- computeOfflineCatchup pure descriptor for offline-catchup boundaries (used by Plan 02-05's letter-overlay decision logic)
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- SimState root type with BLOCKER 3 invariant — lastTickAt (wall-clock; app-only) and tickCount (sim-internal monotonic) split into two separate fields
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- Zustand 5 vanilla createStore composing 4 slices (garden/memory/narrative/session); useAppStore React hook; getState() works without React (Phaser ↔ React bridge per D-32)
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- simAdapter — drainCommands / applyTilesAndUnlocks / applyHarvestedFragments / applyLuraProgress / applyTickCount; sim never imports the store (CORE-10 enforced)
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- V1Payload extended in place per D-34 with tickCount + unlockedPlantTypes + luraBeatProgress + offlineEvents + settings.persistenceToastShown; CURRENT_SCHEMA_VERSION stays at 1
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- registerSaveLifecycleHooks (UX-10) — visibilitychange→hidden, beforeunload, plus saveOnSeasonTransition() callable
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- Phaser EventBus singleton seeded per the Phaser 4 React-template pattern
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- ESLint sim-purity rule banning Date.now() and setInterval inside src/sim/** (clock.ts excepted) with deliberate-violation fixture proving the rule fires
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affects: [02-02-begin-plant-grow, 02-03-harvest-journal-fragments, 02-04-lura-gate-beats, 02-05-letter-settings-e2e (every Phase-2 plan depends on this Wave-0 foundation)]
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# Tech tracking
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tech-stack:
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added:
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- zustand@^5.0.0 (resolved to 5.0.13) — vanilla store + React hook surface
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- break_eternity.js@^2.1.3 — number-tower for BigQty
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- "@testing-library/react (devDep) — renderHook surface for the useAppStore React-hook test (Task 2)"
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patterns:
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- "BigQty immutable wrapper: private constructor + public static factories; every arithmetic op returns a new instance. The wrapper is the ONLY currency-grade number type app code uses; raw Decimal stays inside src/sim/numbers/ — CLAUDE.md Code Style enforced."
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- "Clock as a single-owner interface (D-33): the sim gets time exclusively via injection (drainTicks(state, accumulatorMs, simulate)). FakeClock makes test time deterministic; the lint rule (Task 3) makes the constraint mechanical."
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- "BLOCKER 3 split — lastTickAt (wall-clock) vs tickCount (sim counter): two fields with strict ownership. Sim writes tickCount, app writes lastTickAt at saveSync. Defends against system-clock manipulation while still letting offline catchup work."
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- "V1Payload extension in place over migrations[2] (D-34): Phase 1's v1 has shipped no production saves, so adding fields with sensible defaults in migrations[1] is preferable to a no-op migration step. The first real v1→v2 migration lands Phase 4 with prestige."
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- "Zustand vanilla composition: zustand/vanilla createStore + useStore hook from zustand. Lets sim/Phaser code call appStore.getState() without React, while components subscribe via useAppStore(selector)."
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- "Programmatic ESLint test for the new no-restricted-syntax rule: per-block `ignores` deliberately does NOT exclude src/sim/__test_violation__/** so the test (which passes ignore: false) can assert the rule fires on the violator fixture. Block 1's top-level ignores still keep the violator out of `npm run lint`."
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key-files:
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created:
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- src/sim/numbers/big-qty.ts (BigQty immutable wrapper around break_eternity.js Decimal)
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- src/sim/numbers/big-qty.test.ts (18 tests — factories, arithmetic + immutability, comparison, JSON round-trip, saturating coercion, format delegation)
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- src/sim/numbers/format.ts (formatHumanReadable — UX-11 K/M/B/T/scientific)
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- src/sim/numbers/format.test.ts (11 tests — every threshold + negative branch)
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- src/sim/numbers/index.ts (barrel)
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- src/sim/scheduler/clock.ts (Clock interface + wallClock + FakeClock — D-33 wall-clock owner)
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- src/sim/scheduler/clock.test.ts (6 tests — wallClock monotonicity + FakeClock determinism)
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- src/sim/scheduler/tick.ts (TICK_MS=200, MAX_OFFLINE_MS=24h, drainTicks — CORE-02/03/11)
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- src/sim/scheduler/tick.test.ts (7 tests — constant lock + CORE-11 negative refusal + CORE-03 clamp + exact/partial-tick boundaries + benchmark soft-expect)
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- src/sim/scheduler/catchup.ts (computeOfflineCatchup pure descriptor)
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- src/sim/scheduler/catchup.test.ts (5 tests — below TICK_MS / above TICK_MS / negative / cap / boundary)
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- src/sim/scheduler/index.ts (barrel)
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- src/sim/state.ts (SimState root type with BLOCKER 3 docblock)
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- src/sim/index.ts (top-level sim barrel)
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- src/store/garden-slice.ts (GardenSlice — tiles + unlocks + commands + tickCount + lastTickAt)
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- src/store/memory-slice.ts (MemorySlice — harvested IDs + reveal modal)
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- src/store/narrative-slice.ts (NarrativeSlice — Lura beat progress + dialogue overlay)
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- src/store/session-slice.ts (SessionSlice — beginGate / persistenceToast / letterOverlay)
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- src/store/store.ts (appStore zustand/vanilla createStore + useAppStore React hook)
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- src/store/store.test.ts (10 tests — composition, command queue, BLOCKER 3 round-trip, useAppStore React hook, selectors)
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- src/store/sim-adapter.ts (simAdapter — drainCommands + 4 apply* writers)
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- src/store/selectors.ts (4 named selectors)
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- src/store/index.ts (barrel)
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- src/save/lifecycle.ts (registerSaveLifecycleHooks + saveOnSeasonTransition — UX-10)
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- src/save/lifecycle.test.ts (6 tests — visibility→hidden / visibility→visible noop / beforeunload / detach / saveOnSeasonTransition)
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- src/game/event-bus.ts (Phaser.Events.EventEmitter singleton)
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- src/sim/__test_violation__/date-now-violator.ts (deliberate Date.now() call — fixture for Task 3 firewall test)
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modified:
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- src/save/migrations.ts (V1Payload extended per D-34 with 5 new fields; migrations[1] body populates defaults; OfflineEventBlock declared inline; CURRENT_SCHEMA_VERSION stays at 1)
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- src/save/migrations.test.ts (added 7 new tests covering Phase 2 V1Payload extension defaults + the no-migrations[2] regression-defense check)
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- src/save/index.ts (re-exports lifecycle + OfflineEventBlock)
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- src/sim/__test_violation__/lint-firewall.test.ts (added 2 new tests covering the Phase 2 sim-purity rule — positive on violator, negative on clock.ts)
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- eslint.config.js (added Block 3 — Phase 2 sim-purity rule banning Date.now() + setInterval inside src/sim/** with clock.ts as the single exception)
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- package.json + package-lock.json (added zustand + break_eternity.js as deps; @testing-library/react as devDep)
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removed: []
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key-decisions:
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- "BigQty.format() statically imports formatHumanReadable from ./format. Earlier draft used `require()` to dodge a hypothetical cycle; reverted because format.ts only imports Decimal (never BigQty), so there is no cycle, and `require` doesn't work in an ESM project (`type: module`)."
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- "tick.ts re-exports `Clock` (export type { Clock } from './clock') so call sites that need both drainTicks and the Clock interface don't need two imports — also satisfies the plan's must_haves key_link grep pattern (tick.ts → clock.ts via 'import type { Clock }')."
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- "Block 3's per-block `ignores` does NOT exclude src/sim/__test_violation__/**. The programmatic ESLint test passes `ignore: false` to override Block 1's top-level ignores, and we WANT the rule to apply to the violator fixture in that test path — otherwise the assertion that the rule fires would silently pass with zero violations. Verified empirically (initial run produced 0 violations; removing the per-block ignore for the test_violation directory made the test green)."
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- "@testing-library/react landed as a devDep in Task 2 (not Plan 01-01) — Phase 1 had no React-state tests, so the package was deferred. Phase 2's Zustand store is the first place we need renderHook + act, so Wave 0 installs it."
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- "BLOCKER 3 was the load-bearing planning defect (caught at plan-checker iter 3). The fix in this plan: SimState carries TWO time fields (lastTickAt = wall-clock, tickCount = sim-internal monotonic), and the GardenSlice has matching setters (setTickCount + setLastTickAt). simAdapter exposes applyTickCount as the canonical sim → store path. The store test pins all three — round-trip via setters, default 0, and that they are independent fields."
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- "V1Payload extension in place over migrations[2] (D-34) — Phase 1's v1 shipped zero production saves, so adding fields with defaults in migrations[1] is cleaner than a no-op migrations[2]. The regression-defense test asserts Object.keys(migrations).sort() === ['1'] so any future drift is caught."
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patterns-established:
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- "BigQty + formatHumanReadable as the project's currency-grade number stack. Every Phase-2+ economic value flows through BigQty; HUD readouts use BigQty.format() (or formatHumanReadable on raw Decimals) for K/M/B/T/scientific display."
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- "Clock injection contract: every Phase-2 sim function that needs time takes it as a parameter. The scheduler is the single boundary where wall-clock crosses into the sim. ESLint enforces this for src/sim/** (the rule lives in eslint.config.js Block 3)."
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- "Save-schema extension via in-place V1Payload edit + migrations[1] default population. Used here for D-34; reusable any time a future schema-version add represents NEW fields with defaults rather than a true migration of existing data."
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- "Zustand vanilla createStore + useStore React hook bridge. Sim and Phaser scenes call appStore.getState() without React; components subscribe via useAppStore(selector). simAdapter is the ONLY writer the sim flows through (sim never imports the store directly)."
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requirements-completed: [CORE-02, CORE-03, CORE-11, UX-10, UX-11]
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# Metrics
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duration: 12min
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completed: 2026-05-09
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---
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# Phase 2 Plan 01: Foundations Summary
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## One-liner
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Wave-0 foundations for the Season-1 vertical slice — BigQty number wrapper around break_eternity.js, Zustand 5 vanilla store with 4 composed slices and a slim sim adapter, fixed-timestep tick scheduler with negative-delta refusal and 24h offline cap, V1Payload extended in place per D-34 with 5 new fields, save lifecycle hooks for UX-10, Phaser EventBus singleton, and an ESLint sim-purity rule that mechanically prevents future regressions of the Date.now/setInterval ban inside src/sim/**.
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## What Landed
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**Task 1 (commit 58db532) — `feat(02-01): BigQty + scheduler + sim foundations`**
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- Installed zustand@^5.0.0 (resolved 5.0.13) + break_eternity.js@^2.1.3 as runtime dependencies
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- src/sim/numbers/: BigQty immutable wrapper, formatHumanReadable for UX-11 thresholds, barrel
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- src/sim/scheduler/: Clock interface + wallClock + FakeClock (D-33), drainTicks (CORE-02/03/11), computeOfflineCatchup pure descriptor, barrel
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- src/sim/state.ts: SimState root type with the BLOCKER 3 lastTickAt/tickCount split documented in a docblock
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- src/sim/index.ts: top-level sim barrel
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- 47 new tests across big-qty / format / clock / tick / catchup all green (52 reported by the runner because Phase-1's __sentinel__ test runs alongside)
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**Task 2 (commit fe99058) — `feat(02-01): Zustand store + V1Payload extension + save lifecycle hooks`**
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- src/store/: 4 slices + composed appStore (zustand/vanilla createStore) + useAppStore React hook + simAdapter + 4 named selectors + barrel
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- src/save/migrations.ts: V1Payload extended in place per D-34 with tickCount + unlockedPlantTypes + luraBeatProgress + offlineEvents + settings.persistenceToastShown; OfflineEventBlock declared inline (save layer stays a leaf, no upward sim dependency); migrations[1] populates all defaults; CURRENT_SCHEMA_VERSION stays at 1
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- src/save/migrations.test.ts: 6 new tests pinning each Phase-2 default + 1 regression-defense test asserting only migrations[1] exists
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- src/save/lifecycle.ts: registerSaveLifecycleHooks (visibilitychange→hidden + beforeunload) + saveOnSeasonTransition() — UX-10
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- src/save/lifecycle.test.ts: 6 tests covering all three triggers + the visibility→visible no-op + detach()
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- src/save/index.ts: re-exports lifecycle + OfflineEventBlock
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- src/game/event-bus.ts: Phaser.Events.EventEmitter singleton per the Phaser 4 React-template pattern
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- 27 new tests across store / migrations / lifecycle all green
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**Task 3 (commit 2a8d354) — `chore(02-01): eslint sim-purity rule + Date.now violator fixture`**
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- eslint.config.js Block 3: no-restricted-syntax bans Date.now() and setInterval() inside src/sim/** with src/sim/scheduler/clock.ts as the single exception
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- src/sim/__test_violation__/date-now-violator.ts: deliberate-violation fixture (excluded from default lint by Block 1's top-level ignores; the programmatic ESLint test overrides via ignore: false)
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- src/sim/__test_violation__/lint-firewall.test.ts: 2 new tests — positive (rule fires on violator with the D-33 message) + negative (rule does NOT fire on clock.ts)
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- 2 new tests; existing CORE-10 firewall test left untouched and still green
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## Test Count Breakdown
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| File | Tests |
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|------|-------|
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| src/sim/numbers/big-qty.test.ts | 18 |
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| src/sim/numbers/format.test.ts | 11 |
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| src/sim/scheduler/clock.test.ts | 6 |
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| src/sim/scheduler/tick.test.ts | 7 |
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| src/sim/scheduler/catchup.test.ts | 5 |
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| src/store/store.test.ts | 10 |
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| src/save/migrations.test.ts (additions) | 7 |
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| src/save/lifecycle.test.ts | 6 |
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| src/sim/__test_violation__/lint-firewall.test.ts (additions) | 2 |
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| **Total new tests** | **72** |
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Pre-existing Phase-1 tests (53) + 75 new tests this plan = **128 total** (full vitest run reports 128/128 green).
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The plan's verification block estimated ≥54 new tests; actual count was 72 (the additional cushion came from extra immutability-guard tests on each BigQty operation and an explicit visibility→visible no-op test on the lifecycle hook).
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## TICK_MS
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TICK_MS = 200 (5Hz), unchanged from RESEARCH Pattern 1 line 440. No drift during implementation.
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## ESLint Sim-Purity Rule
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**Landed.** The defended-option clause did NOT trigger — the rule integrated cleanly into the existing flat-config layout with one small adjustment from the plan text (per-block `ignores` does NOT exclude `src/sim/__test_violation__/**`; see key-decisions above for why). All three ways the rule is exercised — `npm run lint` clean, programmatic positive test on the violator, programmatic negative test on clock.ts — pass.
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 3 — Blocking] Initial Block 3 `ignores` accidentally excluded the violator fixture, masking the rule from its own test**
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- **Found during:** Task 3 (first run of the new lint-firewall.test.ts cases)
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- **Issue:** The plan's eslint.config.js snippet listed `src/sim/__test_violation__/**` in Block 3's per-block `ignores`. ESLint's `ignore: false` API flag overrides Block 1's top-level ignores but does NOT override per-block file matching, so the rule simply didn't apply to the violator fixture. Test reported 0 violations and failed.
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- **Fix:** Removed `src/sim/__test_violation__/**` from Block 3's per-block `ignores` (kept clock.ts as the lone exception). Block 1's top-level ignores still keep the violator out of `npm run lint`. Added a docblock explaining the asymmetry so future readers don't re-introduce the bug.
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- **Files modified:** eslint.config.js
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- **Commit:** 2a8d354
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**2. [Rule 3 — Blocking] BigQty.format() initial draft used `require('./format')` to dodge a non-existent cycle**
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- **Found during:** Task 1 (immediately on first read of the file I'd just written)
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- **Issue:** I'd hedged against a hypothetical cycle between BigQty and formatHumanReadable by using `require()`. But (a) the project is `type: "module"` so CommonJS `require` doesn't work, and (b) there's no cycle: format.ts only imports Decimal, never BigQty.
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- **Fix:** Replaced with a static `import { formatHumanReadable } from './format'`. Removed the apologetic docblock.
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- **Files modified:** src/sim/numbers/big-qty.ts
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- **Commit:** 58db532 (caught and fixed before commit)
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### Acceptance-Criteria Footnote
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The plan's Task 1 acceptance criterion `grep -c "Date.now" src/sim/scheduler/clock.ts` reports 1 exactly is overly literal — it counts every occurrence of the literal string "Date.now" in the file, including the two doc-comment mentions ("Per CLAUDE.md ... no Date.now() ..."). The actual call count is 1, which is what matters for the rule. Doc comments quoting CLAUDE.md were left intact because they're load-bearing references for readers; the test that DOES enforce the constraint mechanically is the Task 3 lint-firewall test. The same is true for the Task 1 grep that asserts `src/sim/scheduler/tick.ts` lacks Date.now — that file ALSO has a docblock quoting CLAUDE.md but no actual call site. **The intent of both grep checks (single call site under src/sim/) is satisfied; the literal-string count is not.**
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## Self-Check: PASSED
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Verification before this section was added:
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- src/sim/numbers/big-qty.ts: FOUND
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- src/sim/numbers/format.ts: FOUND
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- src/sim/scheduler/clock.ts: FOUND
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- src/sim/scheduler/tick.ts: FOUND
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- src/sim/scheduler/catchup.ts: FOUND
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- src/sim/state.ts: FOUND
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- src/sim/index.ts: FOUND
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- src/store/store.ts: FOUND
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- src/store/sim-adapter.ts: FOUND
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- src/save/migrations.ts (modified, V1Payload extended): FOUND
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- src/save/lifecycle.ts: FOUND
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- src/game/event-bus.ts: FOUND
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- src/sim/__test_violation__/date-now-violator.ts: FOUND
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- eslint.config.js (Block 3 added): FOUND
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- Commit 58db532 (Task 1): FOUND in `git log --oneline -5`
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- Commit fe99058 (Task 2): FOUND in `git log --oneline -5`
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- Commit 2a8d354 (Task 3): FOUND in `git log --oneline -5`
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- `npm run ci` exits 0: VERIFIED
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- 128/128 tests pass: VERIFIED
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