fix(extractor): compile Devup UI re-exported by project modules and read through namespaces

.changepacks/changepack_log_barrel_namespace_imports.json

@@ -0,0 +1,7 @@
+{
+  "changes": {
+    "bindings/devup-ui-wasm/package.json": "Patch"
+  },
+  "note": "A project module re-exporting Devup UI (export { Box, css } from '@devup-ui/react', export * from '@devup-ui/react', export { styled as s }, export * as Devup, a default export of an import, chains of barrels and the compat entry) now works: a file importing Box or css from it compiles exactly as if it imported from the package, following the barrel through the resolver (relative paths, tsconfig paths, package exports), and hasDevupUI sees such a file. Members read from a namespace or default import of the package (Devup['css'], const { css } = Devup, Devup.css as a value) compile where the build can follow them, `Devup.x` for a name the package compiles being read like the named import. New build errors, located at the use: what a barrel re-exports but the build cannot read (an unresolvable `export *` or module, a namespace of modules re-exporting the package) is an error where its name is used instead of a runtime crash, and a namespace member read by a key the build cannot know (Devup[key]), written, or destructured in a form it cannot follow (a rest, a computed key, a default value, a nested pattern, an exported declaration, or members mixed with ones that stay at runtime) is an error that names the members to read. A namespace passed on whole (Object.keys(Devup), spyOn(Devup, 'css'), export default Devup) is left as it is",
+  "date": "2026-10-01T00:00:00.000Z"
+}

bindings/devup-ui-wasm/src/lib.rs

@@ -10,7 +10,7 @@ use css::file_map::{
 use extractor::extract_style::extract_style_value::ExtractStyleValue;
 use extractor::{
     ExtractOption, ImportAlias, ModuleResolver, ResolvedModule, extract, extract_with_modules,
-    extract_without_source_map, has_devup_ui,
+    extract_without_source_map, has_devup_ui, has_devup_ui_through,
 };
 use rustc_hash::FxHashSet;
 use sheet::StyleSheet;
@@ -549,6 +549,29 @@ fn call_module_resolver(
     })
 }
 
+/// The resolver set by `setModuleResolver`, if any
+#[cfg(not(tarpaulin_include))]
+fn resolver_from_js() -> Option<Box<ModuleResolver>> {
+    let resolver = MODULE_RESOLVER.with_borrow(Clone::clone)?;
+    Some(Box::new(move |specifier: &str, importer: &str| {
+        call_module_resolver(&resolver, specifier, importer)
+    }))
+}
+
+/// [`has_devup_ui`], also true for a file reaching the package through a
+/// project module when there is a resolver
+fn has_devup_ui_in(
+    filename: &str,
+    code: &str,
+    package: &str,
+    resolver: Option<&ModuleResolver>,
+) -> bool {
+    match resolver {
+        Some(resolver) => has_devup_ui_through(filename, code, package, resolver),
+        None => has_devup_ui(filename, code, package),
+    }
+}
+
 /// Extract with the resolver set by `setModuleResolver`, if any
 #[cfg(not(tarpaulin_include))]
 #[allow(clippy::too_many_arguments)]
@@ -730,7 +753,7 @@ pub fn get_theme_interface(
 #[cfg(not(tarpaulin_include))]
 #[must_use]
 pub fn has_devup_ui_wasm(filename: &str, code: &str, package: &str) -> bool {
-    has_devup_ui(filename, code, package)
+    has_devup_ui_in(filename, code, package, resolver_from_js().as_deref())
 }
 
 #[cfg(test)]
@@ -1400,6 +1423,29 @@ mod tests {
         ));
     }
 
+    #[test]
+    fn has_devup_ui_follows_a_barrel_only_with_a_resolver() {
+        let resolver = |specifier: &str, _: &str| {
+            (specifier == "./ui").then(|| ResolvedModule {
+                path: "/src/ui.ts".to_string(),
+                code: "export { Box } from '@devup-ui/react'".to_string(),
+            })
+        };
+        let code = "import { Box } from './ui';";
+        assert!(has_devup_ui_in(
+            "/src/app.tsx",
+            code,
+            "@devup-ui/react",
+            Some(&resolver)
+        ));
+        assert!(!has_devup_ui_in(
+            "/src/app.tsx",
+            code,
+            "@devup-ui/react",
+            None
+        ));
+    }
+
     #[test]
     #[serial]
     fn test_output_single_css_mode() {