perf: skip empty chunk asset hooks

Author: LingyuCoder

crates/rspack_core/src/compilation/create_chunk_assets/mod.rs

@@ -1,8 +1,12 @@
 use async_trait::async_trait;
-use rustc_hash::FxHashSet;
+use rustc_hash::{FxHashMap, FxHashSet};
 
 use super::*;
-use crate::{cache::Cache, compilation::pass::PassExt, logger::Logger};
+use crate::{
+  cache::Cache,
+  compilation::{CompilationChunkAssetHook, pass::PassExt},
+  logger::Logger,
+};
 
 pub struct CreateChunkAssetsPass;
 
@@ -114,7 +118,7 @@ pub async fn create_chunk_assets(
       let s = unsafe { token.used((compilation_ref, &plugin_driver, chunk)) };
 
       s.spawn(|(this, plugin_driver, chunk)| async {
-        let mut manifests = Vec::new();
+        let mut manifests = Vec::with_capacity(2);
         let mut diagnostics = Vec::new();
         plugin_driver
           .compilation_hooks
@@ -134,12 +138,14 @@ pub async fn create_chunk_assets(
   })
   .await;
 
-  let mut chunk_render_results = ChunkRenderArtifact::default();
+  let mut chunk_render_results =
+    FxHashMap::with_capacity_and_hasher(results.len(), Default::default());
   for result in results {
     let item = result.to_rspack_result()?;
     let (key, value) = item?;
     chunk_render_results.insert(key, value);
   }
+  let chunk_render_results = ChunkRenderArtifact::from(chunk_render_results);
   let chunk_ukey_and_manifest = if compilation
     .incremental
     .passes_enabled(IncrementalPasses::CHUNK_ASSET)
@@ -152,6 +158,51 @@ pub async fn create_chunk_assets(
     chunk_render_results
   };
 
+  let has_chunk_asset_hook =
+    has_chunk_asset_taps(&plugin_driver.compilation_hooks.chunk_asset).await;
+
+  if !has_chunk_asset_hook {
+    for (
+      chunk_ukey,
+      ChunkRenderResult {
+        manifests,
+        diagnostics,
+      },
+    ) in chunk_ukey_and_manifest
+    {
+      if !diagnostics.is_empty() {
+        compilation.extend_diagnostics(diagnostics);
+      }
+
+      if manifests.is_empty() {
+        continue;
+      }
+
+      let current_chunk = compilation
+        .build_chunk_graph_artifact
+        .chunk_by_ukey
+        .expect_get_mut(&chunk_ukey);
+
+      current_chunk.set_rendered(true);
+      for file_manifest in &manifests {
+        if file_manifest.auxiliary {
+          current_chunk.add_auxiliary_file(file_manifest.filename.clone());
+        } else {
+          current_chunk.add_file(file_manifest.filename.clone());
+        }
+      }
+
+      for file_manifest in manifests {
+        compilation.emit_asset(
+          file_manifest.filename,
+          CompilationAsset::new(Some(file_manifest.source), file_manifest.info),
+        );
+      }
+    }
+
+    return Ok(());
+  }
+
   for (
     chunk_ukey,
     ChunkRenderResult {
@@ -160,7 +211,13 @@ pub async fn create_chunk_assets(
     },
   ) in chunk_ukey_and_manifest
   {
-    compilation.extend_diagnostics(diagnostics);
+    if !diagnostics.is_empty() {
+      compilation.extend_diagnostics(diagnostics);
+    }
+
+    if manifests.is_empty() {
+      continue;
+    }
 
     for file_manifest in manifests {
       let filename = file_manifest.filename;
@@ -201,3 +258,20 @@ async fn chunk_asset(
     .await?;
   Ok(())
 }
+
+async fn has_chunk_asset_taps(hook: &CompilationChunkAssetHook) -> bool {
+  if !hook.taps.is_empty() {
+    return true;
+  }
+
+  for interceptor in hook.interceptors.iter() {
+    let Ok(taps) = interceptor.call(hook).await else {
+      return true;
+    };
+    if !taps.is_empty() {
+      return true;
+    }
+  }
+
+  false
+}