napi-derive

js_function

```rust

[macro_use]

extern crate napi_rs as napi;

[macro_use]

extern crate napirsderive;

use napi::{CallContext, Error, JsNumber, JsUnknown, Module, Result, Status}; use std::convert::TryInto;

registermodule!(napiderive_example, init);

fn init(module: &mut Module) -> Result<()> { module.createnamedmethod("testThrow", test_throw)?;

module.createnamedmethod("fibonacci", fibonacci)?; Ok(()) }

[js_function]

fn testthrow(ctx: CallContext) -> Result { Err(Error::from_status(Status::GenericFailure)) }

[js_function(1)]

fn fibonacci(ctx: CallContext) -> Result { let n = ctx.get::(0)?.tryinto()?; ctx.env.createint64(fibonacci_native(n)) }

[inline]

fn fibonaccinative(n: i64) -> i64 { match n { 1 | 2 => 1, _ => fibonaccinative(n - 1) + fibonacci_native(n - 2), } } ```