From eb01d43feb80d9052cb4b01d845429c75bc8836c Mon Sep 17 00:00:00 2001
From: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>
Date: Tue, 28 Apr 2026 16:09:35 -0400
Subject: [PATCH] [spi][http_request][demo] Fix latent clang-tidy issues in
 headers (#16080)

---
 esphome/components/demo/demo_alarm_control_panel.h | 2 +-
 esphome/components/http_request/http_request.h     | 2 +-
 esphome/components/spi/spi.h                       | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/esphome/components/demo/demo_alarm_control_panel.h b/esphome/components/demo/demo_alarm_control_panel.h
index 9976e5c7f0..5f0725dd4b 100644
--- a/esphome/components/demo/demo_alarm_control_panel.h
+++ b/esphome/components/demo/demo_alarm_control_panel.h
@@ -29,7 +29,7 @@ class DemoAlarmControlPanel : public AlarmControlPanel, public Component {
  protected:
   void control(const AlarmControlPanelCall &call) override {
     auto state = call.get_state().value_or(ACP_STATE_DISARMED);
-    auto code = call.get_code();
+    const auto &code = call.get_code();
     switch (state) {
       case ACP_STATE_ARMED_AWAY:
         if (this->get_requires_code_to_arm()) {
diff --git a/esphome/components/http_request/http_request.h b/esphome/components/http_request/http_request.h
index f37bf77633..2477e26bc1 100644
--- a/esphome/components/http_request/http_request.h
+++ b/esphome/components/http_request/http_request.h
@@ -462,7 +462,7 @@ template<typename... Ts> class HttpRequestSendAction : public Action<Ts...> {
     this->request_headers_.push_back({key, value});
   }
 
-  void add_collect_header(const char *value) { this->lower_case_collect_headers_.push_back(value); }
+  void add_collect_header(const char *value) { this->lower_case_collect_headers_.emplace_back(value); }
 
   void init_json(size_t count) { this->json_.init(count); }
   void add_json(const char *key, TemplatableValue<std::string, Ts...> value) { this->json_.push_back({key, value}); }
diff --git a/esphome/components/spi/spi.h b/esphome/components/spi/spi.h
index dc538f4c41..e6f592c6e4 100644
--- a/esphome/components/spi/spi.h
+++ b/esphome/components/spi/spi.h
@@ -451,7 +451,7 @@ class SPIDevice : public SPIClient {
 
   uint8_t read_byte() { return this->delegate_->transfer(0); }
 
-  void read_array(uint8_t *data, size_t length) { return this->delegate_->read_array(data, length); }
+  void read_array(uint8_t *data, size_t length) { this->delegate_->read_array(data, length); }
 
   /**
    * Write a single data item, up to 32 bits.