ci: label pull request based on type in title (#25404)

.github/workflows/label-pr.yml

@@ -9,31 +9,73 @@ on:
       - 2.x
 
 jobs:
-  add-pr-label:
-    name: Add PR label
+  add-pr-labels:
+    name: Add PR labels
     runs-on: ubuntu-latest
     permissions:
       pull-requests: write
     if: github.repository == 'nuxt/nuxt'
     steps:
       - uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        env:
+          PULL_REQUEST_TITLE: ${{ github.event.pull_request.title }}
         with:
           script: |
-            const baseName = "${{ github.event.pull_request.base.label }}"
-            const PRNumber = "${{ github.event.pull_request.number }}"
+            const labelsToAdd = []
 
-            if(baseName === "nuxt:2.x") {
-              github.rest.issues.addLabels({
-                issue_number: PRNumber,
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                labels: ["2.x"]
-              })
-            } else if(baseName === "nuxt:main") {
-              github.rest.issues.addLabels({
-                issue_number: PRNumber,
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                labels: ["3.x"]
-              })
+            const pullRequest = {
+              baseLabel: ${{ github.event.pull_request.base.label }},
+              number: ${{ github.event.pull_request.number }},
+              title: process.env.PULL_REQUEST_TITLE,
+              labelsNames: ${{ github.event.pull_request.labels }}.map(
+                (label) => label.name
+              )
             }
+
+            // Select label based on the branch name
+            const branchNameBasedLabelName = {
+              'nuxt:main': '3.x',
+              'nuxt:2.x': '2.x'
+            }[pullRequest.baseLabel]
+
+            if (
+              branchNameBasedLabelName &&
+              !pullRequest.labelsNames.includes(branchNameBasedLabelName)
+            ) {
+              labelsToAdd.push(branchNameBasedLabelName)
+            }
+
+            // Select label based on the type in PR title
+            const eligibleTypesToLabelsNamesMap = {
+              chore: 'chore',
+              ci: 'chore',
+              docs: 'documentation',
+              feat: 'enhancement',
+              fix: 'bug',
+              perf: 'performance',
+              refactor: 'refactor',
+              test: 'test'
+            }
+
+            for (const [eligibleType, labelName] of Object.entries(
+              eligibleTypesToLabelsNamesMap
+            )) {
+              if (
+                pullRequest.title.startsWith(eligibleType) &&
+                !pullRequest.labelsNames.includes(
+                  eligibleTypesToLabelsNamesMap[eligibleType]
+                )
+              ) {
+                labelsToAdd.push(labelName)
+
+                break
+              }
+            }
+
+            // Add selected labels
+            github.rest.issues.addLabels({
+              issue_number: pullRequest.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              labels: labelsToAdd
+            })