clockworklabs/SpacetimeDB · error · anyhow::Error

The --features option is only supported for Rust modules.

Error message

The --features option is only supported for Rust modules.

What it means

Error "The --features option is only supported for Rust modules." thrown in clockworklabs/SpacetimeDB.

Source

Thrown at crates/cli/src/tasks/mod.rs:23

use self::cpp::build_cpp;
use self::csharp::build_csharp;
use self::javascript::build_javascript;
use self::rust::build_rust;

use duct::cmd;

// TODO: Replace the returned `&'static str` with a copy of `HostType` from core.
pub fn build(
    project_path: &Path,
    lint_dir: Option<&Path>,
    build_debug: bool,
    features: Option<&std::ffi::OsString>,
    native_aot: bool,
    dotnet_version: Option<u8>,
) -> anyhow::Result<(PathBuf, &'static str)> {
    let lang = util::detect_module_language(project_path)?;
    if features.is_some() && lang != ModuleLanguage::Rust {
        anyhow::bail!("The --features option is only supported for Rust modules.");
    }
    let output_path = match lang {
        ModuleLanguage::Rust => build_rust(project_path, features, lint_dir, build_debug),
        ModuleLanguage::Csharp => build_csharp(project_path, build_debug, native_aot, dotnet_version),
        ModuleLanguage::Javascript => build_javascript(project_path, build_debug),
        ModuleLanguage::Cpp => build_cpp(project_path, build_debug),
    }?;

    if lang == ModuleLanguage::Javascript {
        Ok((output_path, "Js"))
    } else if build_debug {
        Ok((output_path, "Wasm"))
    } else {
        // for release builds, optimize wasm modules with wasm-opt
        let mut wasm_path = output_path;
        eprintln!("Optimising module with wasm-opt...");
        let wasm_path_opt = wasm_path.with_extension("opt.wasm");
        match cmd!("wasm-opt", "-all", "-g", "-O2", &wasm_path, "-o", &wasm_path_opt).run() {

View on GitHub (pinned to 524b4487d9)

When it happens

Trigger: Thrown at crates/cli/src/tasks/mod.rs:23 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of clockworklabs/SpacetimeDB@524b4487d9 (2026-08-16). Data as JSON: /api/errors/33815a83654439f1. Report an issue: GitHub.