Add PR labeling

.github/workflows/label-prs.yml

@@ -0,0 +1,24 @@
+name: Label PR based on changed package
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - uses: ./.github/actions/setup-and-build
+      with:
+        install-dependencies: false
+        build: false
+
+    - run: pnpm install
+
+    - name: Label PR
+      run: node scripts/labelPrs.js
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

package.json

@@ -9,6 +9,7 @@
   "devDependencies": {
     "@actions/core": "^1.10.0",
     "@actions/exec": "^1.1.1",
+    "@actions/github": "^6.0.0",
     "@changesets/changelog-github": "^0.4.8",
     "@changesets/cli": "^2.26.2",
     "cross-env": "^7.0.3"

scripts/labelPrs.js

@@ -0,0 +1,77 @@
+const github = require("@actions/github");
+const fs = require("fs").promises;
+const path = require("path");
+
+const token = process.env.GITHUB_TOKEN;
+const octokit = github.getOctokit(token);
+
+const rootDir = path.resolve(__dirname, "..");
+
+async function getChangedPackages() {
+  const prNumber = github.context.payload.pull_request.number;
+  const owner = github.context.repo.owner;
+  const repo = github.context.repo.repo;
+
+  const { data: files } = await octokit.rest.pulls.listFiles({
+    owner,
+    repo,
+    pull_number: prNumber,
+  });
+
+  const changedPackages = new Set();
+
+  for (const file of files) {
+    if (file.filename.startsWith("packages/")) {
+      const packageName = file.filename.split("/")[1];
+      changedPackages.add(packageName);
+    }
+  }
+
+  return changedPackages;
+}
+
+async function getLabelsForPackages(packageNames) {
+  const labels = [];
+
+  for (const packageName of packageNames) {
+    const packageJsonPath = path.resolve(
+      rootDir,
+      "packages",
+      packageName,
+      "package.json"
+    );
+    const packageJson = JSON.parse(await fs.readFile(packageJsonPath, "utf8"));
+    const label = `📦 ${packageJson.name}`;
+    labels.push(label);
+  }
+
+  return labels;
+}
+
+async function labelPR(labels) {
+  if (labels.length === 0) return;
+
+  const prNumber = github.context.payload.pull_request.number;
+  const owner = github.context.repo.owner;
+  const repo = github.context.repo.repo;
+
+  await octokit.rest.issues.addLabels({
+    owner,
+    repo,
+    issue_number: prNumber,
+    labels: labels,
+  });
+}
+
+async function run() {
+  const changedPackages = await getChangedPackages();
+  if (changedPackages.size > 0) {
+    const labels = await getLabelsForPackages(changedPackages);
+    await labelPR(labels);
+  }
+}
+
+run().catch((error) => {
+  console.error(error);
+  process.exit(1);
+});