feat(estree/compat): Remove dependency on rayon (#9393)

Co-authored-by: Donny/강동윤 <kdy1997.dev@gmail.com>

.changeset/fresh-windows-kick.md

@@ -0,0 +1,6 @@
+---
+swc_estree_compat: patch
+swc_core: patch
+---
+
+feat(estree/compat): Add concurrent feature

crates/swc_estree_compat/Cargo.toml

@@ -15,17 +15,17 @@ version       = "0.208.0"
 [lib]
 bench = false
 
+[features]
+
 [dependencies]
 ahash      = { workspace = true, features = ["compile-time-rng"] }
 anyhow     = { workspace = true }
 copyless   = { workspace = true }
-rayon      = { workspace = true }
 serde      = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }
 
 swc_atoms = { version = "0.6.5", path = "../swc_atoms" }
 swc_common = { version = "0.37.0", path = "../swc_common", features = [
-  "concurrent",
   "sourcemap",
   "tty-emitter",
 ] }

crates/swc_estree_compat/src/babelify/mod.rs

@@ -1,6 +1,3 @@
-use std::sync::Arc;
-
-use rayon::prelude::*;
 use serde::{de::DeserializeOwned, Serialize};
 use swc_common::{
     comments::{CommentKind, Comments},
@@ -28,7 +25,7 @@ mod typescript;
 
 #[derive(Clone)]
 pub struct Context {
-    pub fm: Arc<SourceFile>,
+    pub fm: Lrc<SourceFile>,
     pub cm: Lrc<SourceMap>,
     pub comments: SwcComments,
 }
@@ -150,15 +147,7 @@ where
     type Output = Vec<T::Output>;
 
     fn babelify(self, ctx: &Context) -> Self::Output {
-        if T::parallel(self.len()) {
-            let flavor = Flavor::current();
-
-            self.into_par_iter()
-                .map(|v| flavor.with(|| v.babelify(ctx)))
-                .collect()
-        } else {
-            self.into_iter().map(|v| v.babelify(ctx)).collect()
-        }
+        self.into_iter().map(|v| v.babelify(ctx)).collect()
     }
 }
 

crates/swc_estree_compat/src/swcify/ctx.rs

@@ -1,13 +1,11 @@
-use std::sync::Arc;
-
-use swc_common::{BytePos, FileName, SourceFile, SourceMap, Span, DUMMY_SP};
+use swc_common::{sync::Lrc, BytePos, FileName, SourceFile, SourceMap, Span, DUMMY_SP};
 use swc_estree_ast::{BaseNode, LineCol, Loc};
 use swc_node_comments::SwcComments;
 
 pub struct Context {
     #[allow(unused)]
-    pub(crate) cm: Arc<SourceMap>,
-    pub(crate) fm: Arc<SourceFile>,
+    pub(crate) cm: Lrc<SourceMap>,
+    pub(crate) fm: Lrc<SourceFile>,
     #[allow(unused)]
     pub(crate) comments: SwcComments,
 }
@@ -57,15 +55,15 @@ impl Context {
     /// stored as interned.
     ///
     /// This method allocate a new [SourceFile] in the given `cm`.
-    pub fn new(cm: Arc<SourceMap>, comments: SwcComments, filename: FileName, src: String) -> Self {
+    pub fn new(cm: Lrc<SourceMap>, comments: SwcComments, filename: FileName, src: String) -> Self {
         let fm = cm.new_source_file(filename.into(), src);
         Self::new_without_alloc(cm, comments, fm)
     }
 
     pub fn new_without_alloc(
-        cm: Arc<SourceMap>,
+        cm: Lrc<SourceMap>,
         comments: SwcComments,
-        fm: Arc<SourceFile>,
+        fm: Lrc<SourceFile>,
     ) -> Self {
         Self { cm, comments, fm }
     }