wasm-bindgen-cli panics with "no entry found for key"

[sanbox-irl]

Describe the Bug

A clear and concise description of what the bug is.

Steps to Reproduce

Using a particular WASM file (I've attached it, but I understand that that could be sketchy), wasm-bindgen panics when I run:

wasm-bindgen calm-clamming.wasm --out-dir server

Expected Behavior

I expected it to make the JS glue file.

Actual Behavior

Crashed with:

❯ wasm-bindgen target/wasm32-unknown-unknown/debug/calm-clamming.wasm --out-dir server
thread 'main' panicked at /Users/jjspira/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasm-bindgen-cli-support-0.2.99/src/wit/mod.rs:481:52:
no entry found for key
stack backtrace:
   0: _rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::option::expect_failed
   3: wasm_bindgen_cli_support::wit::Context::program
   4: wasm_bindgen_cli_support::wit::process
   5: wasm_bindgen_cli_support::Bindgen::generate_output
   6: wasm_bindgen_cli_support::Bindgen::generate
   7: wasm_bindgen::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

calm-clamming.wasm.zip

[daxpedda]

Interesting, its unable to find the main function even though you seem to have marked it with a descriptor. What attributes did you put on your main function and did you compile as a binary or cdylib?

[sanbox-irl]

@daxpedda appreciate your insight! I had forgotten to pass --lib when compiling it (which I do as a cdylib...I think? I just say --lib and I have ["rlib", "cdylib"] in my Cargo.toml, so I'm not sure what happens there).

Correctly passing lib and using the resulting (calm_clamming_lib.wasm) this error goes away.

Should I close the issue?

To answer your question about the main function, it is:

#[cfg(target_family = "wasm")]
use wasm_bindgen::prelude::*;

#[cfg(target_family = "wasm")]
#[wasm_bindgen(start)]
fn main() -> Result<(), JsValue> {
    real_main().unwrap();

    Ok(())
}

[daxpedda]

I was unable to reproduce this. Would you mind creating a minimal reproducable example in a repo? It would be good if we produce a good error message instead of "no entry found for key".

But glad you solved your problem!