From e7735112e8510a589461a951282a8ef4a932a373 Mon Sep 17 00:00:00 2001
From: Koen Kanters <koenkanters94@gmail.com>
Date: Sun, 8 Jan 2023 08:50:10 +0100
Subject: [PATCH] Fix Home Assistant `Entity sensor.xxx (<class
 'homeassistant.components.mqtt.sensor.MqttSensor'>) is using native unit of
 measurement '' which is not a valid unit for the device class ('illuminance')
 ` warning. https://github.com/Koenkk/zigbee2mqtt/issues/15958

---
 lib/extension/homeassistant.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/extension/homeassistant.ts b/lib/extension/homeassistant.ts
index 6bc363879..d2dfe573c 100644
--- a/lib/extension/homeassistant.ts
+++ b/lib/extension/homeassistant.ts
@@ -742,7 +742,7 @@ export default class HomeAssistant extends Extension {
                 discovery_payload: {
                     value_template: `{{ value_json.${firstExpose.property} }}`,
                     enabled_by_default: !allowsSet,
-                    unit_of_measurement: firstExpose.unit || '',
+                    ...(firstExpose.unit && {unit_of_measurement: firstExpose.unit}),
                     ...lookup[firstExpose.name],
                     ...extraAttrs,
                 },