Add custom output type for emccStep function

[ilsadq]

Hello, I spent a long time trying to figure out whether it was possible to build an application without a generated HTML file. While studying the build, I tried adding .js instead of .html for this entry const out_file = emcc.addOutputFileArg(b.fmt("{s}.html", .{wasm.name}));, and it helped. I would like you to add the option to select the output type so that emcc generates only the necessary files.

There may be another solution to my problem, and I would be happy to hear it.

[maiconpintoabreu]

You can change the wasm.name to the file that you want. but I think it should be configurable as well.
Like:

        const wasm = b.addLibrary(.{
            .name = "index",
            .root_module = exe_mod,
        });

[ilsadq]

I created a separate thread where I added:

pub const StepOptions = struct {
    optimize: std.builtin.OptimizeMode,
    flags: EmccFlags,
    settings: EmccSettings,
    use_preload_plugins: bool = false,
    embed_paths: ?[]const EmccFilePath = null,
    preload_paths: ?[]const EmccFilePath = null,
    shell_file_path: ?std.Build.LazyPath = null,
    install_dir: std.Build.InstallDir,
    out_file_type: []const u8 = "html",                 <-- This
};

And

const out_file = emcc.addOutputFileArg(b.fmt("{s}.{s}", .{ wasm.name, options.out_file_type }));

And that solved my problem. Now I can choose which format to build the application in.

[ilsadq]

But I can't push the branch for PR