DioxusLabs/dioxus · error · syn::Error

Async components are not supported

Error message

Async components are not supported

What it means

Error "Async components are not supported" thrown in DioxusLabs/dioxus.

Source

Thrown at packages/core-macro/src/component.rs:477

    // 1. Ensure the component returns *something*
    if item_fn.sig.output == ReturnType::Default {
        return Err(Error::new(
            item_fn.sig.output.span(),
            "Must return a <dioxus_core::Element>".to_string(),
        ));
    }

    // 2. make sure there's no lifetimes on the component - we don't know how to handle those
    if item_fn.sig.generics.lifetimes().count() > 0 {
        return Err(Error::new(
            item_fn.sig.generics.span(),
            "Lifetimes are not supported in components".to_string(),
        ));
    }

    // 3. we can't handle async components
    if item_fn.sig.asyncness.is_some() {
        return Err(Error::new(
            item_fn.sig.asyncness.span(),
            "Async components are not supported".to_string(),
        ));
    }

    // 4. we can't handle const components
    if item_fn.sig.constness.is_some() {
        return Err(Error::new(
            item_fn.sig.constness.span(),
            "Const components are not supported".to_string(),
        ));
    }

    // 5. no receiver parameters
    if item_fn
        .sig
        .inputs
        .iter()

View on GitHub (pinned to 393d190a80)

When it happens

Trigger: Thrown at packages/core-macro/src/component.rs:477 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of DioxusLabs/dioxus@393d190a80 (2026-08-16). Data as JSON: /api/errors/21a202b160f56860. Report an issue: GitHub.