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---
# Product Roadmap: better-pwa

| Metadata | Details |
|----------|---------|
| **Project** | `better-pwa` |
| **Version** | 1.0 (Draft) |
| **Status** | 🟡 In Review |
| **Last Updated** | 2026-04-04 |
| **Owner** | Product & Engineering |
| **Target GA** | Q3 2026 (v1.0) |

---

Table of Contents

  1. Roadmap Overview
  2. Strategic Themes
  3. Phase 1: v0.1 — The Modern Core & State
  4. Phase 2: v0.2 — Update UX & Permissions
  5. Phase 3: v0.3 — Data Consistency & Storage
  6. Phase 4: v0.4 — Platform-Level Coordination
  7. Phase 5: v1.0 — The "Full Stack" Release
  8. Phase 6: v1.1 — Enterprise Control Layer
  9. Post-v1.0: Future Horizons
  10. Risk & Dependency Mapping
  11. Milestone Tracking
  12. Appendix

1. Roadmap Overview

1.1 Timeline Summary

Phase Version Theme Target Date Duration
Phase 1 v0.1 Modern Core & State April 2026 4 weeks
Phase 2 v0.2 Update UX & Permissions May 2026 4 weeks
Phase 3 v0.3 Data Consistency & Storage June 2026 4 weeks
Phase 4 v0.4 Platform-Level Coordination July 2026 4 weeks
Phase 5 v1.0 Full Stack Release August 2026 6 weeks

1.2 Release Philosophy

  • Semantic Versioning: v0.x denotes pre-1.0 (API may change). v1.0 is API-stable.
  • Incremental Value: Each phase delivers standalone production value. No phase is blocked by future work.
  • Dogfooding: Each phase is tested against a real PWA before release.
  • Feature Flags: Unstable features are gated; stable features remain unaffected by WIP.

2. Strategic Themes

Theme Description Phases
Foundation State engine, SW registration, lifecycle bus v0.1
Lifecycle Update strategies, permission batching v0.2
Data Offline queue, storage abstraction, conflict resolution v0.3
Platform Multi-tab sync, observability, plugin system v0.4
Production Security, distribution, CLI, growth engine v1.0

2.2 Dependency Graph

v0.1 (Core) ──────▶ v0.2 (Lifecycle) ──────▶ v0.3 (Data)
     │                      │                       │
     ▼                      ▼                       ▼
  State Engine          Update Controller       Offline Queue
  Lifecycle Bus         Permission Orch.        Storage Abstraction
  SW Builder            Fallback UI             Framework Adapters
                                                  │
                                                  ▼
                     v0.4 (Platform) ◀────────────┘
                          │
                          ▼
                    Multi-Tab Sync
                    Observability
                    Plugin System
                          │
                          ▼
                     v1.0 (Production)
                          │
                          ▼
                    Security Layer
                    Distribution Engine
                    Growth Engine
                    CLI

3. Phase 1: v0.1 — The Modern Core & State

Target Date: April 2026 | Duration: 4 weeks | Theme: Foundation

3.1 Objectives

Establish the foundational layer: reactive state engine, basic lifecycle management, and config-driven SW generation.

3.2 Deliverables

ID Deliverable Description Priority Status
D-01 Core Runtime SW registration, lifecycle event bus, basic error handling P0 🟡 Planned
D-02 State Engine (v1) isOffline, isInstalled, canInstall with reactive subscriptions P0 🟡 Planned
D-03 SW Builder Config-driven sw.js generation (precaching + basic cache strategies) P0 🟡 Planned
D-04 Manifest Engine Basic manifest.json generation from config P1 🟡 Planned
D-05 TypeScript Types Full type definitions for all public APIs P1 🟡 Planned
D-15 Opinionated Presets saas, ecommerce, offline-first, content — 100 decisions → 1 P0 🟡 Planned
D-16 Cold Start Strategy Staged boot: hydrate → sync → update → replay, with failure isolation P0 🟡 Planned

3.3 Technical Tasks

  • Core Runtime

    • Implement BetterPwaRuntime class with init/destroy lifecycle
    • SW registration wrapper with fallback handling
    • Lifecycle event bus (typed events, subscribe/unsubscribe)
    • Error boundary for SW registration failures

  • State Engine

    • Reactive state store (in-memory, immutable snapshots)
    • Network state listener (online/offline events, navigator.connection)
    • Install state listener (beforeinstallprompt, appinstalled)
    • IDB persistence layer for critical state keys
    • BroadcastChannel sync for cross-tab state propagation

  • SW Builder

    • esbuild integration for SW bundling
    • Workbox precaching setup
    • Config schema (better-pwa.config.ts)
    • Output to dist/sw.js with precache manifest injection

  • Manifest Engine

    • JSON manifest generator from config
    • Icon resizing pipeline (512x512 → all required sizes)
    • Output to dist/manifest.json

  • Opinionated Presets

    • Define saas, ecommerce, offline-first, content preset configs
    • Map each preset to update strategy, permission behavior, storage engine, conflict resolution, priority tiers
    • Preset override API (merge custom on top of preset)
    • better-pwa doctor validates preset config quality

  • Cold Start Strategy

    • Staged boot sequence: hydrate → sync → update → replay
    • Per-stage timeout and failure handling
    • Cache freshness validation (date header check)
    • DEGRADED state fallback if hydrate fails

3.4 Acceptance Criteria

  • pwa.state().snapshot() returns accurate isOffline, isInstalled
  • State updates propagate across tabs within 50ms
  • SW builds successfully with better-pwa build
  • Manifest passes basic Lighthouse PWA checks
  • Full TypeScript coverage for public API

3.5 Risk & Mitigation

Risk Likelihood Impact Mitigation
Safari OPFS incompatibility High Medium Graceful degradation to IDB in v0.1
Workbox version conflicts Medium High Pin Workbox version, isolate in SW bundle
Bundle size exceeds 15KB Medium High CI size-check gate, tree-shaking audit

4. Phase 2: v0.2 — Update UX & Permissions

Target Date: May 2026 | Duration: 4 weeks | Theme: Lifecycle

4.1 Objectives

Solve the two most painful parts of PWA development: update management and permission requests.

4.2 Deliverables

ID Deliverable Description Priority Status
D-06 Update Controller soft, hard, gradual, on-reload strategies with state machine P0 🟡 Planned
D-07 Permission Orchestrator Batched requests, state tracking, fallback UI hooks P0 🟡 Planned
D-08 Debug Mode pwa.debug() with real-time state visualization, console diagnostics P1 🟡 Planned
D-09 Logging System Structured logging with levels (debug, info, warn, error) P1 🟡 Planned
D-17 Deterministic State Machine Formal lifecycle: IDLE → BOOT → READY → OFFLINE → SYNCING → STABLE → UPDATING P0 🟡 Planned
D-18 State Migrations Versioned state schema with migration chain, rollback, atomicity P0 🟡 Planned
D-19 Dev-Time Simulator better-pwa simulate CLI + programmatic testing + DevTools panel P1 🟡 Planned

4.3 Technical Tasks

  • Update Controller

    • SW hash polling (configurable interval)
    • State machine: IDLE → DOWNLOADING → WAITING → ACTIVATING
    • Strategy implementations (soft, hard, gradual, on-reload)
    • Gradual rollout logic (deterministic user assignment via seed)
    • Rollback on activation failure
    • Update loop detection and prevention

  • Permission Orchestrator

    • Batch request API with deduplication (skip already-granted)
    • Exponential backoff retry logic (1s, 2s, 4s, 8s)
    • Fallback UI hook system (customizable prompts)
    • Permission state caching (IDB-backed)
    • State invalidation on visibilitychange
    • Pre-prompt hook for custom UI

  • Debug Mode

    • pwa.debug() toggle
    • Console state dump (formatted table)
    • Event stream logging
    • SW health check endpoint

  • Deterministic State Machine

    • Define all states: IDLE, BOOT, READY, OFFLINE, SYNCING, UPDATING, STABLE, DEGRADED
    • Implement transition guards (guard fn, action fn, fallback state)
    • State exposure API: pwa.lifecycle.state(), onTransition()
    • Blocked transition tracking: pwa.lifecycle.blockedTransitions()
    • Plugin integration: plugins declare state-dependent behavior

  • State Migrations

    • Migration registry: pwa.migrations.register(version, fn)
    • Auto-chaining (v1 → v2 → v3)
    • Atomic execution with rollback on failure
    • Migration gate (no reads until migrations complete)
    • Configurable migration window (default: 3 versions back)

  • Dev-Time Simulator

    • CLI: better-pwa simulate offline|slow-network|update|permission-denied|multi-tab|cold-start|storage-full
    • Programmatic API: simulate.offline(pwa), simulate.online(pwa) for test suites
    • Dev server integration: simulation panel in better-pwa preview
    • Tree-shakeable (zero cost in production builds)

4.4 Acceptance Criteria

  • Update detection within 1 SW lifecycle tick (~60s)
  • No update loops or double-activations in multi-tab scenarios
  • Batch permission requests reduce prompts by 60%+
  • Fallback UI shown within 200ms of denial
  • pwa.debug() outputs actionable diagnostics

4.5 Risk & Mitigation

Risk Likelihood Impact Mitigation
Gradual rollout edge cases Medium High Deterministic assignment via hash(seed + userId)
Permission batching unsupported by browser High Medium Fallback to sequential requests with UX explanation
Debug mode leaks to production Low High Tree-shakeable in production builds

5. Phase 3: v0.3 — Data Consistency & Storage

Target Date: June 2026 | Duration: 4 weeks | Theme: Data

5.1 Objectives

Build robust offline data capabilities: mutation queuing, replay engine, and unified storage abstraction.

5.2 Deliverables

ID Deliverable Description Priority Status
D-10 Offline Data Layer Mutation queue, replay engine, optimistic update hooks P0 🟡 Planned
D-11 Storage Abstraction Unified API for OPFS, IDB, memory with engine selection P0 🟡 Planned
D-12 Quota & Eviction Dynamic monitoring, LRU/LFU/TTL eviction policies P1 🟡 Planned
D-13 Framework Adapters @better-pwa/next and @better-pwa/vite support P1 🟡 Planned
D-20 Conflict Resolution Extensibility Custom resolver registration, CRDT-style merging, wildcard patterns P1 🟡 Planned
D-21 Resource Priority System Priority tiers (critical/high/normal/low) affecting replay, eviction, sync P1 🟡 Planned

5.3 Technical Tasks

  • Offline Data Layer

    • IDB-backed mutation queue (FIFO, durable)
    • Replay engine (online event trigger, parallel execution)
    • Conflict resolution strategies (LWW, merge, manual)
    • Optimistic update API (apply locally, revert on failure)
    • Queue persistence across page reloads and browser restarts

  • Storage Abstraction

    • OPFS engine implementation
    • IndexedDB engine implementation
    • Memory engine (fallback, with warning)
    • Automatic engine selection logic
    • Key pattern matching (keys("user:*"))

  • Quota & Eviction

    • navigator.storage.estimate() polling (5min interval)
    • Threshold-based eviction (60% warn, 80% evict, 95% block)
    • LRU, LFU, TTL eviction policies
    • Configurable eviction settings

  • Framework Adapters

    • React: usePwaState(), usePwaUpdate() hooks
    • Vue: usePwaState() composable
    • Svelte: pwaState store
    • Next.js: App Router integration
    • Vite: Plugin for SW injection

  • Conflict Resolution Extensibility

    • Custom resolver registration: pwa.conflicts.register(resource, resolver)
    • Wildcard pattern matching (/api/users/*)
    • CRDT-style merge types (g-counter, pn-counter, OR-set)
    • Fallback to manual queue on resolver failure

  • Resource Priority System

    • Priority tier definitions (critical, high, normal, low)
    • Priority-aware replay queue (critical dequeued first)
    • Priority-aware cache eviction (low evicted first)
    • Priority-aware sync scheduler (critical synced first)
    • Preset default priority mappings
    • Per-operation priority override API

5.4 Acceptance Criteria

  • Mutation queue survives browser restart
  • Replay engine guarantees at-least-once delivery
  • Conflict resolution strategy is configurable per queue
  • Storage engine selection is transparent and configurable
  • Framework adapters are tree-shakeable (0 cost if unused)
  • Quota monitoring triggers eviction before app breaks

5.5 Risk & Mitigation

Risk Likelihood Impact Mitigation
Replay engine drops mutations Low Critical At-least-once guarantee with IDB transaction safety
OPFS API changes in Chrome Medium High Abstract behind adapter, feature-detect
Framework adapter churn Medium Medium Pin peer dependency versions, test matrix

6. Phase 4: v0.4 — Platform-Level Coordination

Target Date: July 2026 | Duration: 4 weeks | Theme: Platform

6.1 Objectives

Enable app-like coordination across tabs, extensibility via plugins, and production observability.

6.2 Deliverables

ID Deliverable Description Priority Status
D-14 Multi-Tab Sync Leader election, state broadcasting, tab lifecycle events P0 🟡 Planned
D-15 Observability Layer Event bus, telemetry adapters, built-in metrics P0 🟡 Planned
D-16 Plugin System pwa.use() architecture, plugin isolation, lifecycle hooks P1 🟡 Planned
D-17 Fugu Bridge (v2) File System Access, File Handling, Window Controls Overlay P2 🟡 Planned
D-22 Capability Confidence Layer Per-API confidence score, browser issue database, adaptive behavior P2 🟡 Planned

6.3 Technical Tasks

  • Multi-Tab Sync

    • BroadcastChannel setup with tab ID generation
    • Leader election algorithm (random timeout, claim broadcast)
    • State synchronization (deduplication via revisionId)
    • Tab join/leave events
    • Leader re-election on disconnect
    • Leader responsibilities (mutation replay, SW activation)

  • Observability Layer

    • Unified event bus (pwa.observe())
    • Built-in metrics (activate_duration, queue_depth, replay_latency)
    • Telemetry adapter interface
    • Official adapters (Datadog, Sentry)
    • Async flush (non-blocking main thread)

  • Plugin System

    • pwa.use(plugin) registration
    • Plugin lifecycle hooks (onInit, onStateChange, onLifecycleEvent)
    • API extension mechanism (extend())
    • Error isolation (plugin errors don't crash runtime)
    • Runtime disable/enable (pwa.plugins.disable())

  • Fugu Bridge

    • File System Access API wrapper
    • File Handling API integration
    • Window Controls Overlay API
    • Badging API convenience methods
    • Feature detection and graceful fallbacks

  • Capability Confidence Layer

    • Confidence scoring: full, partial, fallback, none
    • Browser issue database (Safari BT limitations, Chrome Android quirks)
    • Hardware availability detection (camera/mic presence check)
    • Dynamic confidence updates (permission revoke, hardware disconnect)
    • pwa.capabilities.[api].inspect() detailed report API

6.4 Acceptance Criteria

  • Leader election completes within 100ms
  • State propagation latency <50ms across tabs
  • No duplicate mutation replays during leader transitions
  • All lifecycle events are observable and loggable
  • Plugins can extend API without modifying core
  • Plugin errors are isolated (no runtime crashes)

6.5 Risk & Mitigation

Risk Likelihood Impact Mitigation
Leader tab closes during replay Medium High Immediate re-election, resume from last checkpoint
Plugin API instability Medium High Strict plugin interface, runtime validation
Fugu API browser gaps High Medium Feature-detect, graceful degradation, clear docs

7. Phase 5: v1.0 — The "Full Stack" Release

Target Date: August 2026 | Duration: 6 weeks | Theme: Production

7.1 Objectives

Achieve production-grade stability: security hardening, distribution tooling, growth features, and comprehensive CLI.

7.2 Deliverables

ID Deliverable Description Priority Status
D-18 Security Layer CSP presets, scope isolation, permission policy headers P0 🟡 Planned
D-19 Distribution Engine better-pwa doctor CLI, Lighthouse CI checks, audit tools P0 🟡 Planned
D-20 Push & Background Sync Production-ready notification and sync management P0 🟡 Planned
D-21 Growth Engine Engagement-based install strategies, analytics hooks P1 🟡 Planned
D-22 Global CLI Full project scaffolding, audit tools, interactive debug panel P1 🟡 Planned
D-23 Documentation Complete API docs, guides, migration guides, troubleshooting P1 🟡 Planned
D-24 Runtime Guarantees Formal contract: data durability, update safety, cross-tab consistency, permission resilience, cold start integrity P0 🟡 Planned

7.3 Technical Tasks

  • Security Layer

    • CSP preset generator (strict, moderate, relaxed)
    • Permissions-Policy header generation
    • Manifest scope enforcement (subpath isolation)
    • Secure defaults audit (no unsafe-eval, no inline scripts)

  • Distribution Engine

    • better-pwa doctor CLI (configuration audit, health report)
    • Lighthouse CI integration (PWA score threshold)
    • Automated misconfiguration detection
    • CI/CD pipeline examples (GitHub Actions, GitLab CI)

  • Push & Background Sync

    • Push notification subscription management
    • Background sync event handling
    • Periodic background sync (Origin Trial support)
    • Notification click routing to app

  • Growth Engine

    • Install prompt optimization (engagement-based timing)
    • A/B testing framework for install prompts
    • Analytics hooks (install conversion, session length)
    • pwa.install.optimize() API

  • Global CLI

    • better-pwa init (project scaffolding)
    • better-pwa build (SW + manifest generation)
    • better-pwa preview (local dev server)
    • better-pwa audit (Lighthouse PWA check)
    • better-pwa debug (DevTools panel)

  • Documentation

    • API reference (auto-generated from TypeScript types)
    • Getting started guides (per framework)
    • Migration guides (Workbox → better-pwa)
    • Troubleshooting FAQ
    • Architecture decision records (ADRs)

  • Runtime Guarantees

    • Data durability enforcement (at-least-once delivery, crash durability, no silent drops)
    • Update safety enforcement (no mid-session interruption, no update loops, rollback)
    • Cross-tab consistency enforcement (atomic propagation, leader election, deduplication)
    • Permission resilience enforcement (no silent denials, batch deduplication, retry backoff)
    • Cold start integrity enforcement (staged boot, no race conditions, graceful degradation)
    • Runtime violation detection and reporting (guarantee:at_risk events)
    • CI integration tests for every guarantee (P0 release gate)

7.4 Acceptance Criteria

  • CSP presets pass Lighthouse security audit
  • doctor CLI catches 95% of misconfigurations
  • Push notifications work reliably across Chromium/Safari/Firefox
  • Install optimization improves prompt conversion by 2x
  • Full documentation coverage for all public APIs
  • Zero known P0/P1 bugs at GA

7.5 Risk & Mitigation

Risk Likelihood Impact Mitigation
Safari push incompatibility High High Abstract push notifications; clear feature matrix
Lighthouse PWA criteria changes Medium Medium Monitor Lighthouse releases, update audit logic
Documentation gaps Medium High Dedicated tech writer, dogfooding feedback loop

8. Phase 6: v1.1 — Enterprise Control Layer

Target Date: October 2026 | Duration: 6 weeks | Theme: Enterprise Adoption

8.1 Objectives

Enterprise teams don't adopt on features alone. They adopt on control, compliance, observability, and disaster recovery. This phase adds the layers that make better-pwa safe for Fortune 500 deployments.

8.2 Deliverables

ID Deliverable Description Priority Status
D-25 Auth Guard & Session Continuity Token persistence, cross-tab refresh, offline-aware auth desync prevention P0 🟡 Planned
D-26 Network Intelligence Layer Latency-aware sync, bandwidth profiling, adaptive retry policies P0 🟡 Planned
D-27 Audit Log System Exportable, structured audit trail for all lifecycle events, mutations, permission changes P0 🟡 Planned
D-28 Policy Engine Declarative policies for offline restrictions, storage quotas, permission allowlists P1 🟡 Planned
D-29 Feature Flags (runtime-level) pwa.flags.isEnabled() tied to rollout, update system, A/B testing P1 🟡 Planned
D-30 Disaster Recovery Layer pwa.recovery.reset(), storage corruption detection, queue overflow handling P0 🟡 Planned
D-31 SLA / Reliability Metrics pwa.metrics.get() — uptime, sync success rate, failure rate, mean replay time P0 🟡 Planned
D-32 Enterprise Capability Matrix pwa.capabilities.report() — browser-by-browser support grid with degradation levels P1 🟡 Planned

8.3 Technical Tasks

  • Auth Guard & Session Continuity

    • pwa.auth.guard({ refresh: true, persist: true, crossTabSync: true })
    • Token persistence in IDB with expiry tracking
    • Cross-tab token refresh coordination (only one tab refreshes)
    • Offline-aware auth: queue auth requests, replay on reconnect
    • Expired token detection before mutation replay (prevent 401 storms)
    • Auth state integration with pwa.state()

  • Network Intelligence Layer

    • pwa.network.profile() — returns slow | unstable | fast
    • NetworkRTT and bandwidth estimation via navigator.connection
    • Adaptive sync: defer sync on slow/unstable, aggressive on fast
    • Retry policies per network tier (slow: 3 retries, fast: 5 retries)
    • Network state integration with lifecycle state machine
    • Per-request network quality tagging

  • Audit Log System

    • pwa.audit.log({ action, actor, resource, status, timestamp })
    • Structured JSON audit trail in IndexedDB
    • Export to CSV/JSON for compliance teams
    • Audit events: mutation replay, permission changes, SW updates, sync events
    • Tamper-evident log entries (hash chaining)
    • Configurable retention period (default: 90 days)

  • Policy Engine

    • pwa.policy.enforce({ offline: "allowed", storageLimit: "500mb" })
    • Declarative policy config (JSON/YAML)
    • Admin-defined rules: block offline for certain apps, limit storage, restrict permissions
    • Policy violation events → audit log
    • Enterprise SSO integration for policy distribution
    • MDM (Mobile Device Management) compatibility

  • Feature Flags

    • pwa.flags.isEnabled("new_sync_engine")
    • Remote feature flag polling (configurable endpoint)
    • Integration with rollout/update system
    • A/B testing support (percentage-based flag activation)
    • Flag state visible in pwa.debug() and DevTools

  • Disaster Recovery Layer

    • pwa.recovery.reset({ preserve: ["auth"] }) — nuclear option with selective preservation
    • Storage corruption detection (IDB integrity checks)
    • Mutation queue overflow handling (cap at N entries, alert)
    • SW registration failure auto-recovery
    • Emergency rollback to known-good version
    • Recovery event audit trail

  • SLA / Reliability Metrics

    • pwa.metrics.get() returns: uptime, sync success rate, failure rate, mean replay time
    • SLA dashboard data export (Datadog, Grafana compatible)
    • Historical metrics persistence (survives page reloads)
    • Alerting thresholds (emit events when SLA degrades)
    • Weekly/monthly reliability report generation

  • Enterprise Capability Matrix

    • pwa.capabilities.report() — browser-by-browser feature support grid
    • Output: supported, degraded, fallback, unsupported
    • Maps to GUARANTEES.md — shows which guarantees apply per browser
    • Auto-generated from runtime feature detection

8.4 Acceptance Criteria

  • Auth guard prevents offline 401 storms
  • Network intelligence adapts sync behavior to connection quality
  • Audit logs exportable in compliance-ready format (JSON, CSV)
  • Policy engine enforces admin-defined rules at runtime
  • Disaster recovery resets app to clean state without data loss
  • SLA metrics accurate within 1% of actual performance
  • Capability matrix covers all supported browsers

8.5 Risk & Mitigation

Risk Likelihood Impact Mitigation
Enterprise policy complexity Medium High Start simple (3 policy types), expand based on feedback
Audit log storage bloat High Medium Automatic rotation, configurable retention
Network profiling overhead Low Medium Sample-based estimation, cached profiles

9. Post-v1.0: Future Horizons

9.1 v1.x (Post-GA Enhancements)

Feature Description Target
Widget API Web app widgets (Windows, macOS desktop widgets) Q4 2026
Advanced Caching Cache API streaming, custom SW middleware Q4 2026
AI-Powered Sync ML-based conflict resolution for offline mutations Q1 2027
Cross-Origin Sync Multi-origin state coordination (enterprise SSO) Q1 2027

8.2 Long-Term Vision

  • PWA Standardization: Contribute patterns back to W3C/WHATWG.
  • Framework Partnerships: First-class integration with React, Vue, Svelte, Angular.
  • Enterprise Platform: SSO, MDM integration, compliance reporting.
  • Plugin Marketplace: Community-driven plugin ecosystem.

9. Risk & Dependency Mapping

9.1 Cross-Phase Dependencies

Dependency Source Phase Target Phase Risk Level
State Engine v0.1 v0.2, v0.3, v0.4 Critical
SW Builder v0.1 v0.2, v0.3 High
Update Controller v0.2 v0.4 (multi-tab sync) Medium
Offline Queue v0.3 v0.4 (leader election) High
Plugin System v0.4 v1.0 (growth engine) Medium

9.2 External Dependencies

Dependency Status Impact Mitigation
Workbox v7+ Stable SW precaching Pin version, monitor releases
Chromium Fugu APIs Rolling Feature availability Abstract behind adapters
Safari OPFS Support Partial Storage engine Graceful degradation to IDB
Firefox Service Worker Stable SW lifecycle Test matrix includes Firefox

9.3 Resource Requirements

Role Phase 1 Phase 2 Phase 3 Phase 4 Phase 5
Engineers 2 2 3 3 4
QA 0.5 0.5 1 1 1.5
Tech Writer 0 0 0.5 0.5 1
Product 0.5 0.5 0.5 0.5 1

10. Milestone Tracking

10.1 Key Milestones

Milestone Target Date Success Criteria Status
Core Alpha Week 2, Phase 1 State engine functional, SW builds 🟡 Planned
v0.1 Beta Week 4, Phase 1 Public API stable, docs draft 🟡 Planned
v0.1 GA End of Phase 1 Production-ready for early adopters 🟡 Planned
v0.2 GA End of Phase 2 Update + permissions production-ready 🟡 Planned
v0.3 GA End of Phase 3 Offline data layer production-ready 🟡 Planned
v0.4 GA End of Phase 4 Multi-tab + plugins production-ready 🟡 Planned
v1.0 RC Week 5, Phase 5 Feature complete, bugfix-only 🟡 Planned
v1.0 GA End of Phase 5 Production-ready, docs complete 🟡 Planned

10.2 Go/No-Go Criteria (v1.0 GA)

  • All P0 features implemented and tested
  • Zero P0/P1 bugs open
  • Core bundle <15KB (gzip)
  • All acceptance criteria satisfied
  • Documentation complete (API ref, guides, migration)
  • Dogfooding feedback incorporated
  • Security audit passed
  • Lighthouse PWA score ≥95 for reference implementation
  • All runtime guarantees verified by CI integration tests
  • GUARANTEES.md contract is complete and signed off

11. Appendix

11.1 Glossary

Term Definition
GA General Availability
RC Release Candidate
P0/P1/P2 Priority levels (critical, high, medium)
SW Service Worker
Fugu Project Fugu (Chrome capability APIs)
OPFS Origin Private File System
IDB IndexedDB
CSP Content Security Policy
LWW Last Write Wins
LRU Least Recently Used
LFU Least Frequently Used
TTL Time To Live

11.2 Related Documents

11.3 Revision History

Version Date Author Changes
0.1 2026-03-XX Core Team Initial draft
1.0 2026-04-04 Core Team FAANG-grade structure, milestones, risks

This roadmap is living. Changes require product + engineering alignment and must be communicated to stakeholders.