🌐 Frontier

The world opens up. Cross the frontier.

Frontier is a Agnostic and Native Graphical User Interface (GUI) Framework. It allows developers to create interfaces using Web technologies (HTML5, CSS3, JavaScript) to control backends written in any language (C, Python, Rust, Go, Node.js), consolidating the result into a Single Static Executable for Windows.

📖 Documentation

• 🔭 MANUAL.md: Detailed technical documentation on how to build apps, configure modules, and use the IPC bridge.
• 🗺️ ROADMAP.md: Strategic overview of development phases, completed features, and the transition to a standalone framework.
• 📊 LOGS.md: Overview of the development logging system, event categorization (IPC, Routing, Assets), and zero-overhead production behavior.

How to Get Frontier?

Windows

irm "https://frontier-fw.dev/get.ps1" | iex

For more information about install or uses, refer to the MANUAL.md.

System Architecture

The architecture is based on two distinct Rust binaries that operate in different lifecycles:

🛠️ The Manager (manager.rs) - "The Builder"

Acts as CLI, build system and package orchestrator.

• Configuration: Reads the frontier.toml file to define metadata (version, copyright) and visual resources (icons).
• Module Management: Identifies languages in the app/backend folder and executes necessary pre-compilation based on each module's rules.
• Packaging: Groups assets (HTML, CSS, JS) and compiled binaries.
• Build Pipeline: Invokes the Rust compiler (Cargo) to generate the Core and organizes delivery to the dist/ folder.

🧠 The Core (core.rs) - "The Runtime"

Is the engine of the final executable (e.g. MyApp.exe).

• Native WebView: Renders the interface through the operating system's engine (Edge WebView2 on Windows), statically linked to eliminate external DLL dependencies.
• frontier:// Protocol: Virtual filesystem that serves content directly from memory (Production) or disk (Dev), mitigating CORS errors.
• IPC (Inter-Process Communication): Communication bridge that receives commands from JavaScript (window.ipc.postMessage) and dispatches execution to the backend binary or script in the background.
• Window Orchestration: Defines window properties (dimensions, icon, resizing, min/max constraints) dynamically via <meta> tags in HTML.
• URL Routing & Security: Implements multi-category URL handling (Frontier/Internal/Browser/Blocked) with atomic deduplication to prevent duplicate opens.
• State Persistence: Automatically stores window coordinates and state in %LOCALAPPDATA%, restoring user experience on restart.

Lifecycle and Data Flow

Development Mode (.\frontier dev)

1. Sets the FRONTIER_DEV environment flag.
2. The Core scans app/backend for sources (e.g. .c, .go).
3. On-the-fly Compilation: If detected, invokes the local compiler (e.g. GCC) to generate binaries in a temporary cache (.frontier/target/dev_cache).
4. Hot Reload: A watcher monitors changes. Changes in Front trigger a reload; changes in Back trigger a silent recompilation.

Production Mode (.\frontier build)

1. The Manager cleans and prepares the assets directory.
2. Backend scripts are compiled and moved into the internal bundle.
3. Resource Injection: Generates a dynamic build.rs to embed the .ico icon and metadata directly into the Windows executable manifest.
4. Static Compilation: Core is compiled in Release mode (Static MSVC).
5. Bundling: Uses the rust-embed macro to "consume" all assets, resulting in a single independent binary.

Features Matrix

Feature	Status	Technical Description
Single Executable	✅	A simple, small binary encompasses your entire application.
HTML Configuration	✅	Layout and behavior defined by <meta> tags (width, height, min/max constraints).
Hot Reload	✅	Real-time update for Front and Backend.
Polyglot Support	✅	Modular architecture that accepts any binary via manifest.toml.
URL Routing & Security	✅	Multi-category URL handling with whitelist support and atomic deduplication.
Window Size Constraints	✅	Configurable min/max width and height to control resizing behavior.
Multiple Windows	✅	Open independent windows with separate DOM, styles, and security policies.
Development Logs	✅	Detailed logging in dev mode without polluting production builds.

License

Licensed under the Apache License, Version 2.0 with LLVM Exceptions or The MIT License. See LICENSE-APACHE, LICENSE-MIT, NOTICE and LICENSE folder for details.

Copyright (c) 2026 The Frontier Framework Authors
SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR MIT