index.js

const checkGitBranchName = require('@springtree/check-git-branch-name')

/**
 * Checks if a pull request branch name is valid according to git flow
 *
 * @param {*} context probot handler context
 */
const checkPullRequestValid = async (context) => {
  const repository = context.repo()
  const { sha, ref } = context.payload.pull_request.head
  const statusInfo = { ...repository, sha, context: 'gitflow-branch-bot' }

  // Check if valid
  //
  const valid = ref ? checkGitBranchName({ test: ref, evenReleases: false }) : true

  // Return status
  //
  const message = `Branch ${ref} has ${valid ? 'a valid' : 'an invalid'} git branch name`
  await context.github.repos.createStatus({
    ...statusInfo,
    state: valid ? 'success' : 'failure',
    description: message
  })
}

/**
 * This is the main entrypoint to your Probot app
 *
 * @param {import('probot').Application} app
 */
module.exports = (app) => {
  // Setup check for pull request events
  //
  app.on('pull_request.opened', checkPullRequestValid)
  app.on('pull_request.reopened', checkPullRequestValid)
  app.on('pull_request.synchronize', checkPullRequestValid)
}