44 lines
1.2 KiB
Markdown
44 lines
1.2 KiB
Markdown
# napi-derive
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<a href="https://docs.rs/crate/napi-derive"><img src="https://docs.rs/napi-derive/badge.svg"></img></a>
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<a href="https://crates.io/crates/napi-derive"><img src="https://img.shields.io/crates/v/napi-derive.svg"></img></a>
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<a href="https://discord.gg/SpWzYHsKHs">
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<img src="https://img.shields.io/discord/874290842444111882.svg?logo=discord&style=flat-square"
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alt="chat" />
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</a>
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## js_function
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```rust
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#[macro_use]
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extern crate napi_derive;
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use napi::{CallContext, Error, JsNumber, JsUnknown, Module, Result, Status};
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use std::convert::TryInto;
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#[module_exports]
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fn init(mut exports: JsObject) -> Result<()> {
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exports.create_named_method("testThrow", test_throw)?;
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exports.create_named_method("fibonacci", fibonacci)?;
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Ok(())
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}
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#[js_function]
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fn test_throw(_ctx: CallContext) -> Result<JsUnknown> {
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Err(Error::from_status(Status::GenericFailure))
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}
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#[js_function(1)]
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fn fibonacci(ctx: CallContext) -> Result<JsNumber> {
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let n = ctx.get::<JsNumber>(0)?.try_into()?;
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ctx.env.create_int64(fibonacci_native(n))
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}
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#[inline]
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fn fibonacci_native(n: i64) -> i64 {
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match n {
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1 | 2 => 1,
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_ => fibonacci_native(n - 1) + fibonacci_native(n - 2),
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}
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}
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```
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