add(ci:danger) Check MR area labels

.gitlab/dangerjs/dangerfile.js

@@ -9,7 +9,7 @@ async function runChecks() {
     // Checks for merge request description
     require("./mrDescriptionLongEnough.js")();
     require("./mrDescriptionHasReleaseNotes.js")();
-    await require('./mrDescriptionJiraLinks.js')();
+    await require("./mrDescriptionJiraLinks.js")();
 
     // Checks for documentation
     require("./mrDocsTranslation.js")();
@@ -21,6 +21,9 @@ async function runChecks() {
     // Checks for MR code
     require("./mrSizeTooLarge.js")();
 
+    // Checks for MR area labels
+    await require("./mrAreaLabels.js")();
+
     // Add success log if no issues
     if (
         results.fails.length === 0 &&

.gitlab/dangerjs/mrAreaLabels.js

@@ -0,0 +1,20 @@
+/**
+ * Check if MR has area labels (light blue labels)
+ *
+ * @dangerjs WARN
+ */
+module.exports = async function () {
+    const projectId = 103; // ESP-IDF
+    const areaLabelColor = "#d2eBFA";
+    const projectLabels = await danger.gitlab.api.Labels.all(projectId); // Get all project labels
+    const areaLabels = projectLabels
+        .filter((label) => label.color === areaLabelColor)
+        .map((label) => label.name); // Filter only area labels
+    const mrLabels = danger.gitlab.mr.labels; // Get MR labels
+
+    if (!mrLabels.some((label) => areaLabels.includes(label))) {
+        warn(
+            `Please add some [area labels](${process.env.DANGER_GITLAB_HOST}/espressif/esp-idf/-/labels) to this MR.`
+        );
+    }
+};