denoland-deno/cli/util/result.rs

// Copyright 2018-2025 the Deno authors. MIT license.

use std::convert::Infallible;
use std::fmt::Debug;
use std::fmt::Display;

use deno_core::error::AnyError;
use deno_core::error::CoreError;
use deno_error::JsErrorBox;
use deno_error::JsErrorClass;

pub trait InfallibleResultExt<T> {
  fn unwrap_infallible(self) -> T;
}

impl<T> InfallibleResultExt<T> for Result<T, Infallible> {
  fn unwrap_infallible(self) -> T {
    match self {
      Ok(value) => value,
      Err(never) => match never {},
    }
  }
}

pub fn any_and_jserrorbox_downcast_ref<
  E: Display + Debug + Send + Sync + 'static,
>(
  err: &AnyError,
) -> Option<&E> {
  err
    .downcast_ref::<E>()
    .or_else(|| {
      err
        .downcast_ref::<JsErrorBox>()
        .and_then(|e| e.as_any().downcast_ref::<E>())
    })
    .or_else(|| {
      err.downcast_ref::<CoreError>().and_then(|e| match e {
        CoreError::JsNative(e) => e.as_any().downcast_ref::<E>(),
        _ => None,
      })
    })
}