refactor(syntax): remove ModuleRecord::export_default_duplicated because it is a syntax error (#7576)

crates/oxc_linter/src/module_record.rs

@@ -89,9 +89,6 @@ pub struct ModuleRecord {
     /// `export default name`
     ///         ^^^^^^^ span
     pub export_default: Option<Span>,
-
-    /// Duplicated span of `export default` for diagnostics
-    pub export_default_duplicated: Vec<Span>,
 }
 
 impl fmt::Debug for ModuleRecord {
@@ -117,7 +114,6 @@ impl fmt::Debug for ModuleRecord {
             .field("exported_bindings_duplicated", &self.exported_bindings_duplicated)
             .field("exported_bindings_from_star_export", &self.exported_bindings_from_star_export)
             .field("export_default", &self.export_default)
-            .field("export_default_duplicated", &self.export_default_duplicated)
             .finish()
     }
 }
@@ -477,21 +473,7 @@ impl ModuleRecord {
                 .iter()
                 .map(NameSpan::from)
                 .collect(),
-            exported_bindings_from_star_export: other
-                .exported_bindings_from_star_export
-                .iter()
-                .map(|(name, values)| {
-                    (
-                        PathBuf::from(name.as_str()),
-                        values
-                            .into_iter()
-                            .map(|v| CompactStr::from(v.as_str()))
-                            .collect::<Vec<_>>(),
-                    )
-                })
-                .collect(),
             export_default: other.export_default,
-            export_default_duplicated: other.export_default_duplicated.iter().copied().collect(),
             ..ModuleRecord::default()
         }
     }

crates/oxc_linter/src/rules/import/export.rs

@@ -108,17 +108,6 @@ impl Rule for Export {
                 );
             }
         }
-
-        if !module_record.export_default_duplicated.is_empty() {
-            let mut spans = module_record.export_default_duplicated.clone();
-            if let Some(span) = module_record.export_default {
-                spans.push(span);
-                let labels = spans.into_iter().map(LabeledSpan::underline).collect::<Vec<_>>();
-                ctx.diagnostic(
-                    OxcDiagnostic::warn("Multiple default exports.").with_labels(labels),
-                );
-            }
-        }
     }
 }
 

crates/oxc_linter/src/rules/import/no_default_export.rs

@@ -46,19 +46,12 @@ declare_oxc_lint!(
 impl Rule for NoDefaultExport {
     fn run_once(&self, ctx: &LintContext<'_>) {
         let module_record = ctx.module_record();
-        write_diagnostic_optional(ctx, module_record.export_default);
-        module_record.export_default_duplicated.iter().for_each(|it| write_diagnostic(ctx, *it));
-        write_diagnostic_optional(ctx, module_record.exported_bindings.get("default").copied());
-    }
-}
-
-fn write_diagnostic(ctx: &LintContext<'_>, span: Span) {
-    ctx.diagnostic(no_default_export_diagnostic(span));
-}
-
-fn write_diagnostic_optional(ctx: &LintContext<'_>, span_option: Option<Span>) {
-    if let Some(span) = span_option {
-        write_diagnostic(ctx, span);
+        if let Some(span) = module_record.export_default {
+            ctx.diagnostic(no_default_export_diagnostic(span));
+        }
+        if let Some(span) = module_record.exported_bindings.get("default") {
+            ctx.diagnostic(no_default_export_diagnostic(*span));
+        }
     }
 }
 

crates/oxc_parser/src/module_record.rs

@@ -11,11 +11,17 @@ pub struct ModuleRecordBuilder<'a> {
     allocator: &'a Allocator,
     module_record: ModuleRecord<'a>,
     export_entries: Vec<ExportEntry<'a>>,
+    export_default_duplicated: Vec<Span>,
 }
 
 impl<'a> ModuleRecordBuilder<'a> {
     pub fn new(allocator: &'a Allocator) -> Self {
-        Self { allocator, module_record: ModuleRecord::new(allocator), export_entries: vec![] }
+        Self {
+            allocator,
+            module_record: ModuleRecord::new(allocator),
+            export_entries: vec![],
+            export_default_duplicated: vec![],
+        }
     }
 
     pub fn build(mut self) -> ModuleRecord<'a> {
@@ -36,7 +42,7 @@ impl<'a> ModuleRecordBuilder<'a> {
             errors.push(diagnostics::duplicate_export(&name_span.name, name_span.span, old_span));
         }
 
-        for span in &module_record.export_default_duplicated {
+        for span in &self.export_default_duplicated {
             let old_span = module_record.export_default.unwrap();
             errors.push(diagnostics::duplicate_export("default", *span, old_span));
         }
@@ -88,7 +94,7 @@ impl<'a> ModuleRecordBuilder<'a> {
 
     fn add_default_export(&mut self, span: Span) {
         if let Some(old_node) = self.module_record.export_default.replace(span) {
-            self.module_record.export_default_duplicated.push(old_node);
+            self.export_default_duplicated.push(old_node);
         }
     }
 

crates/oxc_syntax/src/module_record.rs

@@ -59,16 +59,9 @@ pub struct ModuleRecord<'a> {
     /// Local duplicated exported bindings, for diagnostics
     pub exported_bindings_duplicated: Vec<'a, NameSpan<'a>>,
 
-    /// Reexported bindings from `export * from 'specifier'`
-    /// Keyed by resolved path
-    pub exported_bindings_from_star_export: FxHashMap<Atom<'a>, Vec<'a, Atom<'a>>>,
-
     /// `export default name`
     ///         ^^^^^^^ span
     pub export_default: Option<Span>,
-
-    /// Duplicated span of `export default` for diagnostics
-    pub export_default_duplicated: Vec<'a, Span>,
 }
 
 impl<'a> ModuleRecord<'a> {
@@ -83,9 +76,7 @@ impl<'a> ModuleRecord<'a> {
             star_export_entries: Vec::new_in(allocator),
             exported_bindings: FxHashMap::default(),
             exported_bindings_duplicated: Vec::new_in(allocator),
-            exported_bindings_from_star_export: FxHashMap::default(),
             export_default: None,
-            export_default_duplicated: Vec::new_in(allocator),
         }
     }
 }