feat(build): make global exports opt in

Default generated APIs to component-scoped modules and require global_exports(true) for legacy/global slot, handle, class, event, and lowering exports.

req: component/003

req: build/001

examples/v0/build.rs

@@ -1 +1,3 @@
-fn main() { slhx_build::app().run().unwrap(); }
+fn main() {
+    slhx_build::app().global_exports(true).run().unwrap();
+}

slhx-build/src/lib.rs

@@ -13,6 +13,7 @@ use std::sync::Arc;
 pub struct AppBuilder {
     out_dir: Option<PathBuf>,
     template_dir: PathBuf,
+    global_exports: bool,
 }
 
 impl AppBuilder {
@@ -26,6 +27,11 @@ impl AppBuilder {
         self
     }
 
+    pub fn global_exports(mut self, enabled: bool) -> Self {
+        self.global_exports = enabled;
+        self
+    }
+
     pub fn run(self) -> io::Result<()> {
         println!("cargo:rerun-if-changed={}", self.template_dir.display());
 
@@ -54,7 +60,10 @@ impl AppBuilder {
             resources.add_stylesheet(&self.template_dir, &path, &source)?;
         }
 
-        std::fs::write(out_dir.join("slhx.generated.rs"), resources.generated_rs())?;
+        std::fs::write(
+            out_dir.join("slhx.generated.rs"),
+            resources.generated_rs(self.global_exports),
+        )?;
         std::fs::write(out_dir.join("slhx.syms"), resources.syms())?;
         Ok(())
     }
@@ -64,6 +73,7 @@ pub fn app() -> AppBuilder {
     AppBuilder {
         out_dir: None,
         template_dir: PathBuf::from("templates"),
+        global_exports: false,
     }
 }
 
@@ -306,7 +316,7 @@ impl Resources {
         Ok(())
     }
 
-    fn generated_rs(&self) -> String {
+    fn generated_rs(&self, global_exports: bool) -> String {
         let mut out = String::new();
         out.push_str("// @generated by slhx-build. Do not edit.\n");
         out.push_str(&format!(
@@ -318,9 +328,11 @@ impl Resources {
                 .join(", ")
         ));
 
-        // req: build/001
-        self.push_resource_modules(&mut out, None, 0);
-        self.push_lowering_api(&mut out, None, 0);
+        // req: build/001 req: component/003
+        if global_exports {
+            self.push_resource_modules(&mut out, None, 0);
+            self.push_lowering_api(&mut out, None, 0);
+        }
 
         for component in self.component_names() {
             out.push_str("\n#[allow(non_upper_case_globals)]\n");
@@ -1020,7 +1032,7 @@ mod tests {
         )
         .unwrap();
 
-        app().template_dir(&templates).out_dir(&out).run().unwrap();
+        app().template_dir(&templates).out_dir(&out).global_exports(true).run().unwrap();
 
         let generated = std::fs::read_to_string(out.join("slhx.generated.rs")).unwrap();
         assert!(generated.contains("pub mod slots"));
@@ -1055,6 +1067,32 @@ mod tests {
         let _ = std::fs::remove_dir_all(&base);
     }
 
+    #[test]
+    fn global_resource_exports_are_explicit_opt_in() {
+        // req: component/003
+        let base = test_dir("slhx-build-no-global-exports-test");
+        let templates = base.join("templates");
+        let out = base.join("out");
+        let _ = std::fs::remove_dir_all(&base);
+        std::fs::create_dir_all(&templates).unwrap();
+        std::fs::write(
+            templates.join("todo.heml"),
+            r#"<button data-slhx-handle="create">Create</button><div data-slhx-slot="todos"></div>"#,
+        )
+        .unwrap();
+
+        app().template_dir(&templates).out_dir(&out).run().unwrap();
+
+        let generated = std::fs::read_to_string(out.join("slhx.generated.rs")).unwrap();
+        assert!(!generated.contains("\n#[allow(non_upper_case_globals)]\npub mod slots"));
+        assert!(!generated.contains("\npub fn lower_html"));
+        assert!(generated.contains("pub mod todo"));
+        assert!(generated.contains("    pub mod slots"));
+        assert!(generated.contains("    pub fn lower_html"));
+
+        let _ = std::fs::remove_dir_all(&base);
+    }
+
     #[test]
     fn emits_form_contract_metadata_from_surface_controls() {
         // req: codegen/004 req: form/001
@@ -1129,7 +1167,7 @@ mod tests {
         )
         .unwrap();
 
-        app().template_dir(&templates).out_dir(&out).run().unwrap();
+        app().template_dir(&templates).out_dir(&out).global_exports(true).run().unwrap();
 
         let generated = std::fs::read_to_string(out.join("slhx.generated.rs")).unwrap();
         assert!(generated.contains("pub mod classes"));
@@ -1260,7 +1298,7 @@ mod slhx {{
 }}
 {generated}
 fn main() {{
-    let html = lower_html(r#"<form data-slhx-handle="create"><input name="title"></form><li data-slhx-slot="row" data-slhx-key="7"></li>"#);
+    let html = todo::lower_html(r#"<form data-slhx-handle="create"><input name="title"></form><li data-slhx-slot="row" data-slhx-key="7"></li>"#);
     assert!(html.contains(r#"data-hid="#));
     assert!(html.contains(r#"name="__h""#));
     assert!(html.contains(r#"data-key="7""#));