Unused import Clippy warnings despite being used in a server function

[matous-volf]

Problem

Clippy emits warnings about unused imports, even though they are in fact used and required for a successful build. This happens when the code using the import is inside a Dioxus server function.

Steps To Reproduce

Steps to reproduce the behavior:

1. Run

dx new dioxus-unused-import

• bare-bones
• fullstack: true
• router: true
• Tailwind CSS: true
• platform: web

2. Run

cargo add dotenvy

3. Import dotenvy::dotenv and use it inside a Dioxus server function (the auto-generated one in this case):

use dotenvy::dotenv;

#[server(EchoServer)]
async fn echo_server(input: String) -> Result<String, ServerFnError> {
    let _ = dotenv();
    Ok(input)
}

4. Run

cargo clippy

5. Observe the warning:

warning: unused import: `dotenvy::dotenv`
 --> src/main.rs:2:5
  |
2 | use dotenvy::dotenv;
  |     ^^^^^^^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

I've done this in a reproduction repo. The warnings get emited for many more imports than just dotenv, e.g. in this repo.

Removing #[server(EchoServer)] fixes the warning, but of course breaks the functionality. This may be a Clippy issue – I don't have the insight into the macro to judge.

Expected behavior

The warning should not be emited, as the import is used.

Environment:

• Dioxus version: 0.6.1
• Rust version: 1.83.0
• OS info: Docker rust:1.83-bookworm image
• App platform: web

[ryo33]

This document would be helpful.

https://dioxuslabs.com/learn/0.6/guides/fullstack/managing_dependencies#managing-binary-specific-imports