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TURBOPACK: postcss windows transform path resolve #143

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Merged
fireairforce merged 1 commit into from
May 6, 2026
Merged

TURBOPACK: postcss windows transform path resolve #143

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26 changes: 15 additions & 11 deletions turbopack/crates/turbopack-node/src/transforms/postcss.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@ use turbo_tasks::{
};
use turbo_tasks_fs::{
File, FileContent, FileSystemEntryType, FileSystemPath, json::parse_json_with_source_context,
to_sys_path,
};
use turbopack_core::{
asset::{Asset, AssetContent},
Expand Down Expand Up @@ -606,17 +607,20 @@ impl PostCssTransformedAsset {
.to_resolved()
.await?;

let css_fs_path = self.source.ident().path();

// We need to get a path relative to the project because the postcss loader
// runs with the project as the current working directory.
let css_path =
if let Some(css_path) = project_path.get_relative_path_to(&*css_fs_path.await?) {
css_path.into_owned()
} else {
// This shouldn't be an error since it can happen on virtual assets
"".into()
};
let css_fs_path = self.source.ident().path().owned().await?;

// Prefer an absolute filesystem path for PostCSS `from`/`to`.
// Some plugins resolve dependencies relative to these fields, and on
// Windows a cwd-relative path can be joined against the wrong base when
// the project path and root path differ.
let css_path = if let Some(css_path) = to_sys_path(css_fs_path.clone()).await? {
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css_path.to_string_lossy().into_owned()
} else if let Some(css_path) = project_path.get_relative_path_to(&css_fs_path) {
css_path.into_owned()
} else {
// This shouldn't be an error since it can happen on virtual assets
"".into()
};

let config_value = evaluate_webpack_loader(WebpackLoaderContext {
entries,
Expand Down
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