fix(transformer/typescript): declare class incorrectly preserved as runtime class (#3997)

fix: #3993

crates/oxc_transformer/src/typescript/annotations.rs

@@ -83,7 +83,10 @@ impl<'a> TypeScriptAnnotations<'a> {
                         });
 
                         !decl.specifiers.is_empty()
-                            || matches!(&decl.declaration, Some(decl) if !decl.is_typescript_syntax())
+                            || decl
+                                .declaration
+                                .as_ref()
+                                .is_some_and(|decl| !decl.is_typescript_syntax())
                     }
                 }
                 Statement::ExportAllDeclaration(decl) => !decl.export_kind.is_type(),
@@ -170,7 +173,6 @@ impl<'a> TypeScriptAnnotations<'a> {
         class.super_type_parameters = None;
         class.implements = None;
         class.r#abstract = false;
-        class.declare = false;
     }
 
     pub fn transform_class_body(&mut self, body: &mut ClassBody<'a>) {

tasks/transform_conformance/oxc.snap.md

@@ -1,6 +1,6 @@
 commit: 12619ffe
 
-Passed: 5/5
+Passed: 6/6
 
 # All Passed:
 * babel-plugin-transform-typescript

tasks/transform_conformance/tests/babel-plugin-transform-typescript/test/fixtures/elimination-declare/input.ts

@@ -0,0 +1,7 @@
+declare const ReactiveMarkerSymbol: unique symbol
+
+export declare class ReactiveMarker {
+  private [ReactiveMarkerSymbol]?: void
+}
+
+export declare const A = 1

tasks/transform_conformance/tests/babel-plugin-transform-typescript/test/fixtures/elimination-declare/output.js

@@ -0,0 +1 @@
+export {};