Chapter 21: Deployment

Wyn compiles to native binaries - deploy anywhere with zero dependencies.

Building for Production

wyn build src/main.wyn --release
# Produces: src/main (optimized binary, ~170KB)

The --release flag enables:

• -O3 optimization
• Slim runtime header (30% faster)
• System C compiler (clang/gcc)

Cross-Compilation

wyn cross linux src/main.wyn    # Linux x64
wyn cross macos src/main.wyn    # macOS
wyn cross windows src/main.wyn  # Windows (.exe)
wyn cross ios src/main.wyn      # iOS (arm64)
wyn cross android src/main.wyn  # Android (arm64)

Deploy with wyn.toml

[deploy.prod]
host = "myapp.example.com"
user = "deploy"
key = "~/.ssh/id_ed25519"
path = "/opt/myapp"
os = "linux"
pre = "systemctl stop myapp"
post = "systemctl start myapp"

wyn deploy prod
# Cross-compiles for target OS, uploads, runs pre/post commands

Docker

FROM ubuntu:22.04
COPY myapp /usr/local/bin/myapp
EXPOSE 3000
CMD ["myapp"]

Wyn binaries are statically linked - no runtime dependencies needed in the container.

Binary Size

Language	Hello World Binary
Wyn	~170 KB
Go	~2.3 MB
Rust	~3.5 MB

Systemd Service

[Unit]
Description=My Wyn App
After=network.target

[Service]
ExecStart=/opt/myapp/myapp
Restart=always
User=deploy

[Install]
WantedBy=multi-user.target

Health Checks

fn handle(method: string, path: string, body: string, fd: int) {
    if path == "/health" {
        Http.respond(fd, 200, "ok")
        return
    }
    // ... app routes
}