From bb72047b05f325db992cbc338f034874b1c9595b Mon Sep 17 00:00:00 2001
From: Kenzo-Wada <used.acormhib@gmail.com>
Date: Sun, 28 Sep 2025 01:52:19 +0900
Subject: [PATCH 1/2] fix(linter/plugins): postmessage is not called on window
 (#12026)

---
 .../require_post_message_target_origin.rs     | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/crates/oxc_linter/src/rules/unicorn/require_post_message_target_origin.rs b/crates/oxc_linter/src/rules/unicorn/require_post_message_target_origin.rs
index e058db3a8e76f..27afb62f09a84 100644
--- a/crates/oxc_linter/src/rules/unicorn/require_post_message_target_origin.rs
+++ b/crates/oxc_linter/src/rules/unicorn/require_post_message_target_origin.rs
@@ -62,6 +62,9 @@ impl Rule for RequirePostMessageTargetOrigin {
             _ => return,
         };
         if matches!(member_expr.static_property_name(), Some(name) if name == "postMessage") {
+            if is_message_port_expression(member_expr.object()) {
+                return;
+            }
             let span = call_expr.arguments[0].span();
             ctx.diagnostic_with_suggestion(
                 require_post_message_target_origin_diagnostic(Span::new(span.end, span.end)),
@@ -79,6 +82,36 @@ impl Rule for RequirePostMessageTargetOrigin {
     }
 }
 
+fn is_message_port_expression(expr: &Expression<'_>) -> bool {
+    let expr = expr.without_parentheses();
+
+    if let Expression::Identifier(ident) = expr
+        && matches!(ident.name.as_str(), "port" | "port1" | "port2" | "messagePort")
+    {
+        return true;
+    }
+
+    let Some(member_expr) = expr.get_member_expr() else {
+        return false;
+    };
+
+    if member_expr.static_property_name().is_some_and(|name| matches!(name, "port1" | "port2")) {
+        return true;
+    }
+
+    if member_expr.is_computed()
+        && member_expr.object().without_parentheses().get_member_expr().is_some_and(
+            |object_member| {
+                object_member.static_property_name().is_some_and(|name| name == "ports")
+            },
+        )
+    {
+        return true;
+    }
+
+    is_message_port_expression(member_expr.object())
+}
+
 #[test]
 fn test() {
     use crate::tester::Tester;
@@ -101,6 +134,10 @@ fn test() {
         "window.c.postMessage?.(message)",
         "window.a.b?.postMessage(message)",
         "window?.a?.b?.postMessage(message)",
+        "event.ports[0].postMessage(message)",
+        "channel.port1.postMessage(message)",
+        "channel['port2'].postMessage(message)",
+        "event?.ports[0].postMessage(message)",
     ];
 
     let fail = vec![

From e7c2611a8832258a8d7f245d3573ba30b5ac958e Mon Sep 17 00:00:00 2001
From: Kenzo Wada <79452224+Kenzo-Wada@users.noreply.github.com>
Date: Sun, 28 Sep 2025 01:56:48 +0900
Subject: [PATCH 2/2] Update
 crates/oxc_linter/src/rules/unicorn/require_post_message_target_origin.rs

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Kenzo Wada <79452224+Kenzo-Wada@users.noreply.github.com>
---
 .../require_post_message_target_origin.rs     | 45 ++++++++++---------
 1 file changed, 23 insertions(+), 22 deletions(-)

diff --git a/crates/oxc_linter/src/rules/unicorn/require_post_message_target_origin.rs b/crates/oxc_linter/src/rules/unicorn/require_post_message_target_origin.rs
index 27afb62f09a84..b35e46e1fd186 100644
--- a/crates/oxc_linter/src/rules/unicorn/require_post_message_target_origin.rs
+++ b/crates/oxc_linter/src/rules/unicorn/require_post_message_target_origin.rs
@@ -83,33 +83,34 @@ impl Rule for RequirePostMessageTargetOrigin {
 }
 
 fn is_message_port_expression(expr: &Expression<'_>) -> bool {
-    let expr = expr.without_parentheses();
+    let mut current_expr = expr.without_parentheses();
+    loop {
+        if let Expression::Identifier(ident) = current_expr
+            && matches!(ident.name.as_str(), "port" | "port1" | "port2" | "messagePort")
+        {
+            return true;
+        }
 
-    if let Expression::Identifier(ident) = expr
-        && matches!(ident.name.as_str(), "port" | "port1" | "port2" | "messagePort")
-    {
-        return true;
-    }
+        let Some(member_expr) = current_expr.get_member_expr() else {
+            return false;
+        };
 
-    let Some(member_expr) = expr.get_member_expr() else {
-        return false;
-    };
+        if member_expr.static_property_name().is_some_and(|name| matches!(name, "port1" | "port2")) {
+            return true;
+        }
 
-    if member_expr.static_property_name().is_some_and(|name| matches!(name, "port1" | "port2")) {
-        return true;
-    }
+        if member_expr.is_computed()
+            && member_expr.object().without_parentheses().get_member_expr().is_some_and(
+                |object_member| {
+                    object_member.static_property_name().is_some_and(|name| name == "ports")
+                },
+            )
+        {
+            return true;
+        }
 
-    if member_expr.is_computed()
-        && member_expr.object().without_parentheses().get_member_expr().is_some_and(
-            |object_member| {
-                object_member.static_property_name().is_some_and(|name| name == "ports")
-            },
-        )
-    {
-        return true;
+        current_expr = member_expr.object().without_parentheses();
     }
-
-    is_message_port_expression(member_expr.object())
 }
 
 #[test]