refactor(next-core): remove ast cloning in custom transform (#49560)

### What?

- closes WEB-1024.

Minor refactoring to avoid explicit AST cloning. Still visitors are
using fold though.

### Turbopack changes

* vercel/turbo#4869
* vercel/turbo#4879
* vercel/turbo#4881

Cargo.toml

@@ -41,11 +41,11 @@ swc_core = { version = "0.75.41" }
 testing = { version = "0.33.4" }
 
 # Turbo crates
-turbo-binding = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-230508.2" }
+turbo-binding = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-230510.1" }
 # [TODO]: need to refactor embed_directory! macro usages, as well as resolving turbo_tasks::function, macros..
-turbo-tasks = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-230508.2" }
+turbo-tasks = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-230510.1" }
 # [TODO]: need to refactor embed_directory! macro usage in next-core
-turbo-tasks-fs = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-230508.2" }
+turbo-tasks-fs = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-230510.1" }
 
 # General Deps
 

packages/next-swc/crates/next-core/src/next_shared/transforms/mod.rs

@@ -9,10 +9,6 @@ pub use next_dynamic::get_next_dynamic_transform_rule;
 pub use next_font::get_next_font_transform_rule;
 pub use next_strip_page_exports::get_next_pages_transforms_rule;
 pub use relay::get_relay_transform_plugin;
-use swc_core::{
-    common::util::take::Take,
-    ecma::ast::{Module, ModuleItem, Program},
-};
 use turbo_binding::turbopack::{
     core::reference_type::{ReferenceType, UrlReferenceSubType},
     turbopack::module_options::{ModuleRule, ModuleRuleCondition, ModuleRuleEffect, ModuleType},
@@ -53,18 +49,3 @@ pub(crate) fn module_rule_match_js_no_url() -> ModuleRuleCondition {
         ]),
     ])
 }
-
-pub(crate) fn unwrap_module_program(program: &mut Program) -> Program {
-    match program {
-        Program::Module(module) => Program::Module(module.take()),
-        Program::Script(s) => Program::Module(Module {
-            span: s.span,
-            body: s
-                .body
-                .iter()
-                .map(|stmt| ModuleItem::Stmt(stmt.clone()))
-                .collect(),
-            shebang: s.shebang.clone(),
-        }),
-    }
-}

packages/next-swc/crates/next-core/src/next_shared/transforms/modularize_imports.rs

@@ -77,18 +77,14 @@ impl ModularizeImportsTransformer {
 
 #[async_trait]
 impl CustomTransformer for ModularizeImportsTransformer {
-    async fn transform(
-        &self,
-        program: &mut Program,
-        _ctx: &TransformContext<'_>,
-    ) -> Result<Option<Program>> {
+    async fn transform(&self, program: &mut Program, _ctx: &TransformContext<'_>) -> Result<()> {
         let p = std::mem::replace(program, Program::Module(Module::dummy()));
         *program = p.fold_with(&mut modularize_imports(
             turbo_binding::swc::custom_transform::modularize_imports::Config {
                 packages: self.packages.clone(),
             },
         ));
 
-        Ok(None)
+        Ok(())
     }
 }