feat(turbopack): Enable lightningcss for turbopack by default (#62565)

# Turbopack

* vercel/turbo#7682 <!-- Will Binns-Smith -
Turbopack HMR: url-encode sourceURLs -->
* vercel/turbo#7524 <!-- Donny/강동윤 -
feat(turbopack): Enable lightningcss for turbopack by default -->


### What?

Enable lightningcss by default, for `--turbo` mode.

### Why?

It's time to do it 😄 

### How?

Turbopack counterpart: vercel/turbo#7524


Closes PACK-2600

Cargo.toml

@@ -37,11 +37,11 @@ swc_core = { version = "0.90.17", features = [
 testing = { version = "0.35.20" }
 
 # Turbo crates
-turbopack-binding = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-240308.3" }
+turbopack-binding = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-240311.1" }
 # [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-240308.3" }
+turbo-tasks = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-240311.1" }
 # [TODO]: need to refactor embed_directory! macro usage in next-core
-turbo-tasks-fs = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-240308.3" }
+turbo-tasks-fs = { git = "https://github.com/vercel/turbo.git", tag = "turbopack-240311.1" }
 
 # General Deps
 

packages/next-swc/crates/next-core/src/next_client/context.rs

@@ -243,7 +243,7 @@ pub async fn get_client_module_options_context(
         .cell()
     });
 
-    let use_lightningcss = *next_config.use_lightningcss().await?;
+    let use_swc_css = *next_config.use_swc_css().await?;
     let target_browsers = env.runtime_versions();
 
     let mut next_client_rules =
@@ -321,7 +321,7 @@ pub async fn get_client_module_options_context(
             ),
         ],
         custom_rules: next_client_rules,
-        use_lightningcss,
+        use_swc_css,
         ..module_options_context
     }
     .cell();

packages/next-swc/crates/next-core/src/next_config.rs

@@ -390,6 +390,7 @@ pub struct ExperimentalTurboConfig {
     pub rules: Option<IndexMap<String, RuleConfigItem>>,
     pub resolve_alias: Option<IndexMap<String, JsonValue>>,
     pub resolve_extensions: Option<Vec<String>>,
+    pub use_swc_css: Option<bool>,
 }
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize, TraceRawVcs)]
@@ -504,8 +505,6 @@ pub struct ExperimentalConfig {
     /// (doesn't apply to Turbopack).
     webpack_build_worker: Option<bool>,
     worker_threads: Option<bool>,
-
-    use_lightningcss: Option<bool>,
 }
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize, TraceRawVcs)]
@@ -836,9 +835,14 @@ impl NextConfig {
     }
 
     #[turbo_tasks::function]
-    pub async fn use_lightningcss(self: Vc<Self>) -> Result<Vc<bool>> {
+    pub async fn use_swc_css(self: Vc<Self>) -> Result<Vc<bool>> {
         Ok(Vc::cell(
-            self.await?.experimental.use_lightningcss.unwrap_or(false),
+            self.await?
+                .experimental
+                .turbo
+                .as_ref()
+                .and_then(|turbo| turbo.use_swc_css)
+                .unwrap_or(false),
         ))
     }
 }