fix: join path

crates/rspack_core/src/compiler/mod.rs

@@ -8,7 +8,7 @@ use rspack_error::Result;
 use rspack_fs::{IntermediateFileSystem, NativeFileSystem, ReadableFileSystem, WritableFileSystem};
 use rspack_futures::FuturesResults;
 use rspack_hook::define_hook;
-use rspack_paths::{Utf8Path, Utf8PathBuf};
+use rspack_paths::{Utf8Component, Utf8Path, Utf8PathBuf};
 use rspack_sources::BoxSource;
 use rustc_hash::FxHashMap as HashMap;
 use tracing::instrument;
@@ -354,7 +354,22 @@ impl Compiler {
   ) -> Result<()> {
     if let Some(source) = asset.get_source() {
       let (target_file, query) = filename.split_once('?').unwrap_or((filename, ""));
-      let file_path = output_path.join(target_file);
+      let file_path = {
+        let target_path = Utf8Path::new(target_file);
+        if target_path.is_absolute() {
+          let mut relative_path = Utf8PathBuf::new();
+          for component in target_path.components() {
+            match component {
+              Utf8Component::Prefix(_) => continue,
+              Utf8Component::RootDir => continue,
+              _ => relative_path.push(component),
+            }
+          }
+          output_path.join(relative_path)
+        } else {
+          output_path.join(target_path)
+        }
+      };
       self
         .output_filesystem
         .create_dir_all(

crates/rspack_plugin_devtool/Cargo.toml

@@ -26,8 +26,8 @@ rspack_plugin_javascript = { workspace = true }
 rspack_util              = { workspace = true }
 rustc-hash               = { workspace = true }
 simd-json                = { workspace = true }
+sugar_path               = { workspace = true }
 tracing                  = { workspace = true }
-sugar_path                  = { workspace = true }
 
 [package.metadata.cargo-shear]
 ignored = ["tracing"]

crates/rspack_plugin_devtool/src/source_map_dev_tool_plugin.rs

@@ -453,6 +453,7 @@ impl SourceMapDevToolPlugin {
                 source_map_path.push(Component::RootDir);
                 source_map_path.extend(Path::new(&source_map_filename).components());
 
+                #[allow(clippy::unwrap_used)]
                 file_path
                   .parent()
                   .unwrap()

packages/rspack-test-tools/tests/configCases/compilation/emit-asset/rspack.config.js

@@ -0,0 +1,31 @@
+const path = require("path");
+const fs = require("fs");
+
+const PLUGIN_NAME = "plugin";
+
+class Plugin {
+    /**
+     * @param {import("@rspack/core").Compiler} compiler
+     */
+    apply(compiler) {
+        const { RawSource } = compiler.rspack.sources;
+
+        compiler.hooks.compilation.tap(PLUGIN_NAME, compilation => {
+            compilation.hooks.processAssets.tap(PLUGIN_NAME, () => {
+                compilation.emitAsset("/foo.txt", new RawSource(""));
+            });
+        });
+
+        compiler.hooks.afterCompile.tap(PLUGIN_NAME, () => {
+            const outputPath = path.join(compiler.options.output.path, "/foo.txt");
+            console.log("outputPath: ", outputPath);
+            expect(fs.existsSync(outputPath)).toBe(true);
+        });
+    }
+}
+
+/**@type {import("@rspack/core").Configuration}*/
+module.exports = {
+    entry: "./index.js",
+    plugins: [new Plugin()]
+};