emnapiCurrently you can use napi-rs like this, more work is working in progress.
Note: WASI target require rust nightly toolchain.
toml
[package]
edition = "2021"
name = "binding"
version = "0.0.0"
# We should build binary for WASI reactor
# https://github.com/rust-lang/rust/pull/79997
# https://github.com/WebAssembly/WASI/issues/24
# for wasm
[[bin]]
name = "binding"
path = "src/main.rs"
# for native
# [lib]
# name = "binding"
# path = "src/lib.rs"
# crate-type = ["cdylib"]
[dependencies]
napi = { version = "2.12.1", default-features = false, features = ["napi8"] }
napi-sys = { version = "2.2.3", features = ["napi8"] }
napi-derive = "2.12.2"
[build-dependencies]
napi-build = "2.0.1"
[profile.release]
strip = "symbols"[package]
edition = "2021"
name = "binding"
version = "0.0.0"
# We should build binary for WASI reactor
# https://github.com/rust-lang/rust/pull/79997
# https://github.com/WebAssembly/WASI/issues/24
# for wasm
[[bin]]
name = "binding"
path = "src/main.rs"
# for native
# [lib]
# name = "binding"
# path = "src/lib.rs"
# crate-type = ["cdylib"]
[dependencies]
napi = { version = "2.12.1", default-features = false, features = ["napi8"] }
napi-sys = { version = "2.2.3", features = ["napi8"] }
napi-derive = "2.12.2"
[build-dependencies]
napi-build = "2.0.1"
[profile.release]
strip = "symbols"toml
[build]
target = [
"wasm32-unknown-unknown",
"wasm32-wasi"
]
[target.wasm32-unknown-unknown]
rustflags = [
"-L./node_modules/emnapi/lib/wasm32",
"-lemnapi",
"-ldlmalloc", # "-lemmalloc",
"-C", "link-arg=--no-entry",
"-C", "link-arg=--initial-memory=16777216",
"-C", "link-arg=--export-dynamic",
"-C", "link-arg=--export=malloc",
"-C", "link-arg=--export=free",
"-C", "link-arg=--export=napi_register_wasm_v1",
"-C", "link-arg=--export-table",
"-C", "link-arg=--import-undefined",
]
[target.wasm32-wasi]
rustflags = [
"-L./node_modules/emnapi/lib/wasm32-wasi",
"-lemnapi",
"-C", "link-arg=--initial-memory=16777216",
"-C", "link-arg=--export-dynamic",
"-C", "link-arg=--export=malloc",
"-C", "link-arg=--export=free",
"-C", "link-arg=--export=napi_register_wasm_v1",
"-C", "link-arg=--export-table",
"-C", "link-arg=--import-undefined",
"-Z", "wasi-exec-model=reactor", # +nightly
][build]
target = [
"wasm32-unknown-unknown",
"wasm32-wasi"
]
[target.wasm32-unknown-unknown]
rustflags = [
"-L./node_modules/emnapi/lib/wasm32",
"-lemnapi",
"-ldlmalloc", # "-lemmalloc",
"-C", "link-arg=--no-entry",
"-C", "link-arg=--initial-memory=16777216",
"-C", "link-arg=--export-dynamic",
"-C", "link-arg=--export=malloc",
"-C", "link-arg=--export=free",
"-C", "link-arg=--export=napi_register_wasm_v1",
"-C", "link-arg=--export-table",
"-C", "link-arg=--import-undefined",
]
[target.wasm32-wasi]
rustflags = [
"-L./node_modules/emnapi/lib/wasm32-wasi",
"-lemnapi",
"-C", "link-arg=--initial-memory=16777216",
"-C", "link-arg=--export-dynamic",
"-C", "link-arg=--export=malloc",
"-C", "link-arg=--export=free",
"-C", "link-arg=--export=napi_register_wasm_v1",
"-C", "link-arg=--export-table",
"-C", "link-arg=--import-undefined",
"-Z", "wasi-exec-model=reactor", # +nightly
]rust
#![no_main]
use napi_derive::napi;
#[napi]
fn fibonacci(n: u32) -> u32 {
match n {
1 | 2 => 1,
_ => fibonacci(n - 1) + fibonacci(n - 2),
}
}#![no_main]
use napi_derive::napi;
#[napi]
fn fibonacci(n: u32) -> u32 {
match n {
1 | 2 => 1,
_ => fibonacci(n - 1) + fibonacci(n - 2),
}
}js
const fs = require('fs')
const path = require('path')
const useWASI = false
let wasi
if (useWASI) {
const { WASI } = require('wasi')
wasi = new WASI({ /* ... */ })
}
const { instantiateNapiModule } = require('@emnapi/core')
const wasmBuffer = useWASI
? fs.readFileSync(path.join(__dirname, './target/wasm32-wasi/release/binding.wasm'))
: fs.readFileSync(path.join(__dirname, './target/wasm32-unknown-unknown/release/binding.wasm'))
instantiateNapiModule(wasmBuffer, {
context: require('@emnapi/runtime').getDefaultContext(),
wasi,
beforeInit ({ instance }) {
for (const sym in instance.exports) {
if (sym.startsWith('__napi_register__')) {
instance.exports[sym]()
}
}
},
overwriteImports (importObject) {
importObject.env = {
...importObject.env,
...importObject.napi,
...importObject.emnapi
}
}
}).then(({ napiModule }) => {
const binding = napiModule.exports
// output: 5
console.log(binding.fibonacci(5))
})const fs = require('fs')
const path = require('path')
const useWASI = false
let wasi
if (useWASI) {
const { WASI } = require('wasi')
wasi = new WASI({ /* ... */ })
}
const { instantiateNapiModule } = require('@emnapi/core')
const wasmBuffer = useWASI
? fs.readFileSync(path.join(__dirname, './target/wasm32-wasi/release/binding.wasm'))
: fs.readFileSync(path.join(__dirname, './target/wasm32-unknown-unknown/release/binding.wasm'))
instantiateNapiModule(wasmBuffer, {
context: require('@emnapi/runtime').getDefaultContext(),
wasi,
beforeInit ({ instance }) {
for (const sym in instance.exports) {
if (sym.startsWith('__napi_register__')) {
instance.exports[sym]()
}
}
},
overwriteImports (importObject) {
importObject.env = {
...importObject.env,
...importObject.napi,
...importObject.emnapi
}
}
}).then(({ napiModule }) => {
const binding = napiModule.exports
// output: 5
console.log(binding.fibonacci(5))
})