chore: automerge only for prs (#41)

.github/dependabot.js

@@ -0,0 +1,45 @@
+'use strict'
+
+const getMergeMethod = (repo) => {
+  if (repo.allow_merge_commit) return 'merge'
+  if (repo.allow_squash_merge) return 'squash'
+  return 'rebase'
+}
+
+module.exports = async ({
+  github,
+  context
+}) => {
+  const owner = context.payload.repository.owner.login
+  const repo = context.payload.repository.name
+  const prNumber = context.payload.pull_request.number
+
+  const {
+    data: pr
+  } = await github.pulls.get({
+    owner,
+    repo,
+    pull_number: prNumber
+  })
+
+  const isDependabotOwner = pr.user.login === 'dependabot[bot]'
+  const isMergable = pr.mergeable
+
+  if (!isDependabotOwner || !isMergable) {
+    return console.log('Unable to merge', isDependabotOwner, isMergable)
+  }
+
+  await github.pulls.createReview({
+    owner,
+    repo,
+    pull_number: prNumber,
+    event: 'APPROVE'
+  })
+
+  await github.pulls.merge({
+    owner,
+    repo,
+    pull_number: prNumber,
+    merge_method: getMergeMethod(pr.head.repo)
+  })
+}

.github/workflows/nodejs.yml

@@ -32,20 +32,12 @@ jobs:
     needs: test
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v2
       - name: Dependabot Auto Merge
         uses: actions/github-script@v3
-        if: ${{ github.actor == 'dependabot[bot]' }}
+        if: ${{ github.actor == 'dependabot[bot]' && github.event_name == 'pull_request' }}
         with:
           github-token: ${{secrets.github_token}}
           script: |
-            github.pulls.createReview({
-              owner: context.payload.repository.owner.login,
-              repo: context.payload.repository.name,
-              pull_number: context.payload.pull_request.number,
-              event: 'APPROVE'
-            })
-            github.pulls.merge({
-              owner: context.payload.repository.owner.login,
-              repo: context.payload.repository.name,
-              pull_number: context.payload.pull_request.number
-            })
+            const automerge = require(`${process.env.GITHUB_WORKSPACE}/.github/dependabot.js`)
+            await automerge({github, context})