Zigsh - Binary build tools on the Zig build system

Even though zig is great at building everything from source, sometimes a build tool is easier to be reused as a binary distribution, especially if hermetic built versions are available.

We can use lazy Dependencies to switch the required binary

Bun

this build.zig offers a BunModuleStep to bundle a javascript file with its dependencies on the build graph. It works by creating a package.json in the zig's build cache, then running bun install and bun bun to download and install the js dependencies. The output is a std.Build.LazyPath that can be reused on other build steps

// build.zig
const zigsh = @import("zigsh");

// pub fn build(...
const bundled_js = zigsh.BunModuleStep.add(b, .{
    .name = "index.js",
    .out_basename = "index.js",
    .root_source_file = b.path("src/js/index.js"), // input js file
    .optimize = optimize, // 
    .verbose = b.verbose,
    .sourcemap = true,
    .dependencies = &.{
        .{
            .name = "hello-world-npm",
            .version = zigsh.semver("1.1.1"),
        },
    },
});
const bundled_js_path: std.Build.LazyPath = bundled_js.bun.output;