Static CURRENT_ENV 

pub static CURRENT_ENV: LocalKey<Env>

A well-known tokio::task_local napi::Env accessible without argument drilling.

This is a pseudo napi::CURRENT_ENV that can be relied upon in third-party code that can’t take a napi::Env argument, such as an isomorphic API across NAPI-RS, wasm-bindgen, and native implementation.

You should use sync_scope or scope at every NAPI-RS entry point that provides you with a napi::Env to ensure that this well-known global is set for all code within your task that might need it.

# use napi_derive::napi;
# use napi::bindgen_prelude::*;
# #[allow(unused_imports)]
# use std::{error::Error, result::Result};
use napi_current_env::CURRENT_ENV;
 
#[napi]
fn print_greeting(env: Env, name: &str) -> napi::Result<()> {
  CURRENT_ENV.sync_scope(env, || {
    // Your code here...
  })
}
 
#[napi]
async fn fetch_data(env: Env, name: &str) -> napi::Result<String> {
  CURRENT_ENV.scope(env, async || {
    // Your async code here...
  })
}
 
#[napi(module_exports)]
fn module_exports(mut exports: Object, env: Env) -> napi::Result<()> {
  CURRENT_ENV.sync_scope(env, || {
    // Your code here...
  })
}

Example

# use napi_derive::napi;
# use napi::bindgen_prelude::*;
# #[allow(unused_imports)]
# use std::{error::Error, result::Result};
use napi_current_env::CURRENT_ENV;
 
# fn main() {}
#
 
mod another_crate {
  // #[cfg(feature = "napi")]
  fn greet(name: &str) -> napi::Result<String> {
#   use napi::bindgen_prelude::*;
#   #[allow(unused_imports)]
#   use std::{error::Error, result::Result};
    use napi_current_env::CURRENT_ENV;
    let env = CURRENT_ENV.get();
    let file_url_string = env.get_module_file_name()?;
    let message = format!("Hello {} from {}!", name, file_url_string);
    Ok(message)
  }
  // #[cfg(feature = "wasm-bindgen")]
  // ...
  // #[cfg(not(any(feature = "napi", feature = "wasm-bindgen")))]
  // ...
}
 
#[napi]
fn print_greeting(env: Env, name: &str) -> napi::Result<()> {
  CURRENT_ENV.sync_scope(env, || {
    let greeting = another_crate::greet(name)?;
    println!("{}", greeting);
    Ok(())
  })
}