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Golang / GoLang Production Patterns and Web Standards Interview Questions

How do you embed static files into a Go binary using go:embed?

//go:embed (Go 1.16) embeds files and directories into the compiled binary at build time. This eliminates the need to distribute static assets separately — the binary is fully self-contained.

import "embed"

// Embed a single file as a string
//go:embed VERSION
var version string

// Embed a single file as bytes
//go:embed config/default.yaml
var defaultConfig []byte

// Embed multiple files as an FS
//go:embed static/*
var staticFiles embed.FS

// Embed entire directory tree (include hidden files with all:)
//go:embed all:templates
var templates embed.FS

// Serving embedded static files
func main() {
    // Serve from embedded FS
    staticFS, err := fs.Sub(staticFiles, "static")
    if err != nil { log.Fatal(err) }

    mux := http.NewServeMux()
    mux.Handle("/static/",
        http.StripPrefix("/static/", http.FileServer(http.FS(staticFS))))

    // HTML template from embedded FS
    tmpl := template.Must(
        template.New("").ParseFS(templates, "templates/*.html"))

    mux.HandleFunc("GET /", func(w http.ResponseWriter, r *http.Request) {
        tmpl.ExecuteTemplate(w, "index.html", map[string]any{
            "Version": version,
        })
    })

    http.ListenAndServe(":8080", mux)
}

// embed.FS implements fs.FS — compatible with all fs.FS consumers

What is the main advantage of using //go:embed for static assets?
What does 'all:templates' in '//go:embed all:templates' do differently from 'templates/*'?

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