fix(directive): compile inputs:/outputs: declared in decorator metadata

crates/oxc_angular_compiler/Cargo.toml

@@ -42,6 +42,7 @@ cross_file_elision = ["oxc_resolver", "pathdiff"]
 
 [dev-dependencies]
 insta = { workspace = true, features = ["glob"] }
+serde_json = { workspace = true }
 tempfile = "3"
 
 [lints]

crates/oxc_angular_compiler/src/component/decorator.rs

@@ -19,7 +19,7 @@ use super::metadata::{
 use super::transform::ImportMap;
 use crate::directive::{
     StringConsts, extract_host_bindings, extract_host_listeners, extract_input_metadata,
-    extract_output_metadata,
+    extract_output_metadata, merge_by_class_property, parse_decorator_io,
 };
 use crate::output::oxc_converter::convert_oxc_expression;
 
@@ -261,11 +261,18 @@ pub fn extract_component_metadata<'a>(
     metadata.constructor_deps =
         extract_constructor_deps(allocator, class, import_map, has_superclass);
 
-    // Extract inputs from @Input decorators on class members
-    metadata.inputs = extract_input_metadata(allocator, class, source_text);
-
-    // Extract outputs from @Output decorators on class members
-    metadata.outputs = extract_output_metadata(allocator, class);
+    // Inputs/outputs from the `inputs:`/`outputs:` metadata, overridden by
+    // @Input/@Output/signal members ({...fromMeta, ...fromFields} in ngtsc).
+    let io = parse_decorator_io(allocator, config_obj, source_text, consts);
+    metadata.inputs = merge_by_class_property(
+        io.inputs,
+        extract_input_metadata(allocator, class, source_text),
+        |i| i.class_property_name.as_str(),
+    );
+    metadata.outputs =
+        merge_by_class_property(io.outputs, extract_output_metadata(allocator, class), |o| {
+            o.0.as_str()
+        });
 
     // Detect if ngOnChanges lifecycle hook is implemented
     // Similar to Angular's: const usesOnChanges = members.some(member => ...)

crates/oxc_angular_compiler/src/component/mod.rs

@@ -21,6 +21,7 @@ mod transform;
 #[cfg(feature = "cross_file_elision")]
 pub use cross_file_elision::CrossFileAnalyzer;
 pub use decorator::extract_component_metadata;
+pub(crate) use decorator::find_component_decorator;
 pub use definition::{
     ComponentDefinitions, const_value_to_expression, generate_component_definitions,
 };

crates/oxc_angular_compiler/src/component/transform.rs

@@ -41,7 +41,7 @@ use crate::class_metadata::{
 use crate::directive::collect_string_consts;
 use crate::directive::{
     R3QueryMetadata, create_content_queries_function, create_view_queries_function,
-    extract_content_queries, extract_directive_metadata, extract_view_queries,
+    decorator_io_errors, extract_content_queries, extract_directive_metadata, extract_view_queries,
     find_directive_decorator, find_directive_decorator_span, generate_directive_definitions,
 };
 use crate::dts;
@@ -2578,6 +2578,11 @@ pub fn transform_angular_file(
             // Compute implicit_standalone based on Angular version
             let implicit_standalone = options.implicit_standalone();
 
+            // `inputs:`/`outputs:` forms ngtsc rejects, rather than dropping them silently.
+            for error in decorator_io_errors(allocator, class, &string_consts) {
+                result.diagnostics.push(OxcDiagnostic::error(error));
+            }
+
             if let Some(mut metadata) = extract_component_metadata(
                 &allocator,
                 class,