napi-rs/examples/napi/src/error.rs

use napi::bindgen_prelude::*;

#[napi]
pub fn throw_error() -> Result<()> {
  Err(Error::new(Status::InvalidArg, "Manual Error".to_owned()))
}

#[napi(catch_unwind)]
pub fn panic() {
  panic!("Don't panic");
}

#[napi]
pub fn receive_string(s: String) -> String {
  s
}

pub enum CustomError {
  NapiError(Error<Status>),
  Panic,
}

impl AsRef<str> for CustomError {
  fn as_ref(&self) -> &str {
    match self {
      CustomError::Panic => "Panic",
      CustomError::NapiError(e) => e.status.as_ref(),
    }
  }
}

#[napi]
pub fn custom_status_code() -> Result<(), CustomError> {
  Err(Error::new(CustomError::Panic, "don't panic"))
}