fix(es/lints: Handle ts export import equals (#5225)

crates/swc/tests/errors/lints/duplicate-exports/6/.swcrc

@@ -0,0 +1,11 @@
+{
+    "$schema": "http://json.schemastore.org/swcrc",
+    "jsc": {
+        "parser": {
+            "syntax": "typescript"
+        }
+    },
+    "module": {
+        "type": "commonjs"
+    }
+}

crates/swc/tests/errors/lints/duplicate-exports/6/input.ts

@@ -0,0 +1,5 @@
+export import _ = require("lodash");
+
+const lodash = _;
+
+export { lodash as _ };

crates/swc/tests/errors/lints/duplicate-exports/6/output.swc-stderr

@@ -0,0 +1,16 @@
+
+  x the name `_` is exported multiple times
+   ,-[1:1]
+ 1 | export import _ = require("lodash");
+   :               |
+   :               `-- previous exported here
+ 2 | 
+ 3 | const lodash = _;
+ 4 | 
+ 5 | export { lodash as _ };
+   :                    |
+   :                    `-- exported more than once
+   `----
+
+Error: 
+  > Exported identifiers must be unique

crates/swc_ecma_lints/src/rules/duplicate_exports.rs

@@ -136,6 +136,12 @@ impl Visit for DuplicateExports {
         };
     }
 
+    fn visit_ts_import_equals_decl(&mut self, n: &TsImportEqualsDecl) {
+        if n.is_export && !n.is_type_only && !n.declare {
+            self.add(&n.id)
+        }
+    }
+
     fn visit_ts_export_assignment(&mut self, n: &TsExportAssignment) {
         self.add_export_assign(n.span);
     }