feat: Add (experimental) nodejs interop crates (#9974)

**Description:**

I'm experimenting with various options.

crates/swc_interop_babel/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+authors       = ["강동윤 <kdy1997.dev@gmail.com>"]
+description   = "General interop for Babel"
+documentation = "https://rustdoc.swc.rs/swc_interop_babel/"
+edition       = { workspace = true }
+license       = { workspace = true }
+name          = "swc_interop_babel"
+repository    = { workspace = true }
+version       = "0.1.0"
+
+
+[dependencies]
+napi       = { workspace = true, features = ["napi4"] }
+serde      = { workspace = true, features = ["derive"] }
+serde_json = { workspace = true }
+
+swc_interop_nodejs = { version = "0.1.0", path = "../swc_interop_nodejs" }

crates/swc_interop_babel/src/lib.rs

@@ -0,0 +1 @@
+pub mod transform;

crates/swc_interop_babel/src/transform.rs

@@ -0,0 +1,26 @@
+use napi::JsFunction;
+use serde::{Deserialize, Serialize};
+use swc_interop_nodejs::{js_hook::JsHook, types::AsJsonString};
+
+pub struct JsTrasnform {
+    f: JsHook<AsJsonString<TransformOutput>, AsJsonString<TransformOutput>>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct TransformOutput {
+    pub code: String,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub map: Option<String>,
+}
+
+impl JsTrasnform {
+    pub fn new(env: &napi::Env, f: &JsFunction) -> napi::Result<Self> {
+        Ok(Self {
+            f: JsHook::new(env, f)?,
+        })
+    }
+
+    pub async fn transform(&self, input: TransformOutput) -> napi::Result<TransformOutput> {
+        Ok(self.f.call(AsJsonString(input)).await?.0)
+    }
+}

crates/swc_interop_nodejs/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+authors       = ["강동윤 <kdy1997.dev@gmail.com>"]
+description   = "General interop for Node.js"
+documentation = "https://rustdoc.swc.rs/swc_interop_nodejs/"
+edition       = { workspace = true }
+license       = { workspace = true }
+name          = "swc_interop_nodejs"
+repository    = { workspace = true }
+version       = "0.1.0"
+
+
+[dependencies]
+napi       = { workspace = true, features = ["napi4", "tokio_rt", "serde-json"] }
+serde      = { workspace = true }
+serde_json = { workspace = true }
+tokio      = { workspace = true }
+tracing    = { workspace = true }

crates/swc_interop_nodejs/src/js_hook.rs

@@ -0,0 +1,52 @@
+use std::marker::PhantomData;
+
+use napi::{
+    bindgen_prelude::Promise,
+    threadsafe_function::{ThreadSafeCallContext, ThreadsafeFunction},
+    JsFunction,
+};
+use tracing::trace;
+
+use crate::types::{JsInput, JsOutput};
+
+pub struct JsHook<I, O>
+where
+    I: JsInput,
+    O: JsOutput,
+{
+    f: ThreadsafeFunction<I>,
+    _marker: PhantomData<O>,
+}
+
+impl<I, O> JsHook<I, O>
+where
+    I: JsInput,
+    O: JsOutput,
+{
+    pub fn new(env: &napi::Env, f: &JsFunction) -> napi::Result<Self> {
+        Ok(Self {
+            f: env.create_threadsafe_function(f, 0, |cx: ThreadSafeCallContext<I>| {
+                let arg = cx.value.into_js(&cx.env)?.into_unknown();
+
+                if cfg!(debug_assertions) {
+                    trace!("Converted to js value");
+                }
+                Ok(vec![arg])
+            })?,
+            _marker: PhantomData,
+        })
+    }
+
+    #[tracing::instrument(skip_all, fields(perf = "JsHook::call"))]
+    pub async fn call(&self, input: I) -> napi::Result<O> {
+        if cfg!(debug_assertions) {
+            trace!("Calling js function");
+        }
+
+        let result: Promise<O> = self.f.call_async(Ok(input)).await?;
+
+        let res = result.await?;
+
+        Ok(res)
+    }
+}

crates/swc_interop_nodejs/src/lib.rs

@@ -0,0 +1,2 @@
+pub mod js_hook;
+pub mod types;

crates/swc_interop_nodejs/src/types.rs

@@ -0,0 +1,86 @@
+use std::fmt::Debug;
+
+use napi::{bindgen_prelude::FromNapiValue, Env, JsUnknown};
+use serde::{de::DeserializeOwned, Serialize};
+
+pub trait JsInput: 'static + Send + Debug {
+    fn into_js(self, env: &Env) -> napi::Result<JsUnknown>;
+}
+
+impl JsInput for String {
+    fn into_js(self, env: &Env) -> napi::Result<JsUnknown> {
+        Ok(env.create_string(&self)?.into_unknown())
+    }
+}
+
+impl JsInput for Vec<String> {
+    fn into_js(self, env: &Env) -> napi::Result<JsUnknown> {
+        let mut arr = env.create_array_with_length(self.len())?;
+
+        for (idx, s) in self.into_iter().enumerate() {
+            arr.set_element(idx as _, s.into_js(env)?)?;
+        }
+
+        Ok(arr.into_unknown())
+    }
+}
+
+impl JsInput for Vec<u8> {
+    fn into_js(self, env: &Env) -> napi::Result<JsUnknown> {
+        Ok(env.create_buffer_with_data(self)?.into_unknown())
+    }
+}
+
+impl<A, B> JsInput for (A, B)
+where
+    A: JsInput,
+    B: JsInput,
+{
+    fn into_js(self, env: &Env) -> napi::Result<JsUnknown> {
+        let mut arr = env.create_array(2)?;
+        arr.set(0, self.0.into_js(env)?)?;
+        arr.set(1, self.1.into_js(env)?)?;
+
+        Ok(arr.coerce_to_object()?.into_unknown())
+    }
+}
+
+/// Seems like Vec<u8> is buggy
+pub trait JsOutput: 'static + FromNapiValue + Send + Debug {}
+
+impl JsOutput for String {}
+
+impl JsOutput for bool {}
+
+/// Note: This type stringifies the output json string, because it's faster.
+#[derive(Debug, Default)]
+pub struct AsJsonString<T>(pub T)
+where
+    T: 'static + Send + Debug;
+
+impl<T> FromNapiValue for AsJsonString<T>
+where
+    T: 'static + Send + Debug + DeserializeOwned,
+{
+    unsafe fn from_napi_value(
+        env_raw: napi::sys::napi_env,
+        napi_val: napi::sys::napi_value,
+    ) -> napi::Result<Self> {
+        let env = Env::from_raw(env_raw);
+        let json: String = env.from_js_value(JsUnknown::from_napi_value(env_raw, napi_val)?)?;
+        let t = serde_json::from_str(&json)?;
+        Ok(Self(t))
+    }
+}
+
+impl<T> JsOutput for AsJsonString<T> where T: 'static + Send + Debug + DeserializeOwned {}
+
+impl<T> JsInput for AsJsonString<T>
+where
+    T: 'static + Send + Debug + Serialize,
+{
+    fn into_js(self, env: &napi::Env) -> napi::Result<napi::JsUnknown> {
+        let json = serde_json::to_string(&self.0)?;
+        Ok(env.create_string(json.as_str())?.into_unknown())
+    }
+}