---
title: "Overview"
slug: "overview-3"
updated: 2026-08-26T07:52:02Z
published: 2026-08-26T07:52:02Z
canonical: "docs.viewlift.com/overview-3"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.viewlift.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

## Overview

These are the core internal libraries that power platform functionality. They are not module-specific — they provide shared infrastructure that modules consume.

| Library | Source | Purpose |
| --- | --- | --- |
| Upload Engine | `UploadEngine/` | Centralized file upload orchestration |
| Command Center | `CommandCenter/` | Unified intent surface for navigation and actions |
| Save and Load Preset Manager | `SaveAndLoadPresetManager/` | Versioned preset transport serialization and parsing |
| Feature Flags | `FeatureFlag/` | Feature flag evaluation and management |
| Shortcut Manager | `ShortcutManager/` | Scoped keyboard shortcut engine |
| Live Stream Runtime | `LiveStreamRuntime/` | Live stream state management |
| Polling Manager | `PollingManager/` | Centralized keyed polling registry and lifecycle |
| Activity Beacon | `ActivityBeacon/` | User activity tracking and heartbeat |
| Cookie Manager | `CookieManager.ts` | Cookie read/write abstraction |
| Theme Manager | `ThemeManager.ts` | Runtime theme switching |
| Tour Manager | `TourManager.ts` | Guided product tour orchestration |
| Permissions | `Permission.ts` | Permission checking and guards |
| Validations | `Validations.ts` | Shared validation utilities |
| AppError | `AppError.ts` | Typed error class (see Platform) |
| AsyncHandler | `AsyncHandler.ts` | Safe async execution (see Platform) |