check-changeset-added.yml

# Fails if a PR doesn't have a changeset and is not labeled
# as "no changeset needed"

name: Check that the PR has a changeset

on:
  pull_request:
    branches:
      - main
    types:
      - opened
      - synchronize
      - reopened
      - labeled
      - unlabeled

jobs:
  check-if-changeset:
    name: Check that PR has a changeset
    runs-on: ubuntu-latest
    steps:
      - uses: actions/github-script@v6
        with:
          script: |
            const pullNumber = context.issue.number;

            const { data: files } = await github.rest.pulls.listFiles({
              ...context.issue,
              pull_number: pullNumber
            });
            const changeset = files.find(
              file => file.status === "added" && file.filename.startsWith(".changeset/")
            );
            if (changeset !== undefined) {
              console.log("Changeset found:", changeset.filename);
              return;
            }

            console.log("No changeset found");


            const { data: pull } = await github.rest.pulls.get({
              ...context.issue,
              pull_number: pullNumber
            });
            const noChangesetNeededLabel = pull.labels
              .some(l => l.name === "no changeset needed");
            if (noChangesetNeededLabel) {
              console.log('The PR is labeled as "no changeset needed"');
              return;
            }

            console.log('The PR is not labeled as "no changeset needed"');

            process.exit(1);