From 0e216dceb5f4e7f6ee784049dc6f7fef09412f23 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20L=C3=B3pez=20Prat?= <daniel@6temes.cat>
Date: Wed, 8 Jul 2026 16:39:10 +0200
Subject: [PATCH] Linter: Treat `breadcrumb` as a side-effecting helper in
 `erb-no-unused-expressions`

---
 .../packages/linter/src/rules/erb-no-unused-expressions.ts | 1 +
 .../linter/test/rules/erb-no-unused-expressions.test.ts    | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/javascript/packages/linter/src/rules/erb-no-unused-expressions.ts b/javascript/packages/linter/src/rules/erb-no-unused-expressions.ts
index 3e3787861..cd6a248d8 100644
--- a/javascript/packages/linter/src/rules/erb-no-unused-expressions.ts
+++ b/javascript/packages/linter/src/rules/erb-no-unused-expressions.ts
@@ -27,6 +27,7 @@ const MUTATION_METHODS = new Set([
 ])
 
 const SIDE_EFFECT_METHODS = new Set([
+  "breadcrumb",
   "content_for",
   "provide",
   "flush",
diff --git a/javascript/packages/linter/test/rules/erb-no-unused-expressions.test.ts b/javascript/packages/linter/test/rules/erb-no-unused-expressions.test.ts
index e4055d719..a8aa27d09 100644
--- a/javascript/packages/linter/test/rules/erb-no-unused-expressions.test.ts
+++ b/javascript/packages/linter/test/rules/erb-no-unused-expressions.test.ts
@@ -131,6 +131,13 @@ describe("ERBNoUnusedExpressionsRule", () => {
       `)
     })
 
+    test("passes for breadcrumb", () => {
+      expectNoOffenses(dedent`
+        <% breadcrumb :page %>
+        <% breadcrumb :product, @product %>
+      `)
+    })
+
     test("passes for assert_valid_keys", () => {
       expectNoOffenses(dedent`
         <%