clockworklabs/SpacetimeDB · error · anyhow::Error

getrandom usage detected. It seems like either you or a cra

Error message

getrandom usage detected.

It seems like either you or a crate in your dependency tree is depending on
the `getrandom` crate for random number generation. getrandom is the default
randomness source for the `rand` crate, and is used when you call
`rand::random()` or `rand::thread_rng()`. If this is you, you should instead
use `ctx.rng()` on a `ReducerContext`. If this is a crate in your
tree, you should try to see if the crate provides a way to pass in a custom
`Rng` type, and pass it the rng returned from `ctx.rng()`.

What it means

Error "getrandom usage detected. It seems like either you or a crate in your dependency tree is depending on the `getrandom` crate for random number generation. getrandom is the default randomness source for the `rand` crate, and is used when you call `rand::random()` or `rand::thread_rng()`. If this is you, you should instead use `ctx.rng()` on a `ReducerContext`. If this is a crate in your tree, you should try to see if the crate provides a way to pass in a custom `Rng` type, and pass it the rng returned from `ctx.rng()`." thrown in clockworklabs/SpacetimeDB.

Source

Thrown at crates/cli/src/tasks/rust.rs:133

    };
    let Ok(module) = wasmbin::Module::decode_from(&mut io::BufReader::new(file)) else {
        return Ok(());
    };
    if has_wasm_bindgen(&module) {
        anyhow::bail!(
            "wasm-bindgen detected.\n\
             \n\
             It seems like either you or a crate in your dependency tree is depending on\n\
             wasm-bindgen. wasm-bindgen is only for webassembly modules that target the web\n\
             platform, and will not work in the context of SpacetimeDB.\n\
             \n\
             To find the offending dependency, run `cargo tree -i wasm-bindgen`. Try checking\n\
             its cargo features for 'js' or 'web' or 'wasm-bindgen' to see if there's a way\n\
             to disable it."
        )
    }
    if has_getrandom(&module) {
        anyhow::bail!(
            "getrandom usage detected.\n\
             \n\
             It seems like either you or a crate in your dependency tree is depending on\n\
             the `getrandom` crate for random number generation. getrandom is the default\n\
             randomness source for the `rand` crate, and is used when you call\n\
             `rand::random()` or `rand::thread_rng()`. If this is you, you should instead\n\
             use `ctx.rng()` on a `ReducerContext`. If this is a crate in your\n\
             tree, you should try to see if the crate provides a way to pass in a custom\n\
             `Rng` type, and pass it the rng returned from `ctx.rng()`."
        )
    }
    Ok(())
}

const WBINDGEN_PREFIX: &str = "__wbindgen";
fn has_wasm_bindgen(module: &wasmbin::Module) -> bool {
    let check_import = |import: &wasmbin::sections::Import| {
        import.path.module.starts_with(WBINDGEN_PREFIX) || import.path.name.starts_with(WBINDGEN_PREFIX)

View on GitHub (pinned to 524b4487d9)

When it happens

Trigger: Thrown at crates/cli/src/tasks/rust.rs:133 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/e633513e0fad29ce. Report an issue: GitHub.