Auto-merge GitHub PR when all checks passed

index.js

(() => {
  const check = () => {
    const status = document.querySelector('[data-combined-status]').dataset.combinedStatus
       
    switch(status) {
      case 'success':
        const btn = document.querySelector('[data-details-container=".js-merge-pr"]')
        if (!btn) {
          alert('PR already merged.')
          break
        } else {
          document.querySelector('.merge-branch-form.js-merge-pull-request').submit()
          alert('PR merged :)')
          break
        }
      case 'failure':
      case 'pending':
        if (window.automerger) clearTimeout(window.automerger)
        window.automerger = setTimeout(check, 2000)
        console.log('waiting for PR success')
        break
      default:
        console.log('Unknown PR status (?)', status)
    }
  }

  check()
})()