index.js

const core = require('@actions/core');
const { context, getOctokit } = require('@actions/github');

const Config = require('./lib/config')
const Pull = require('./lib/pull');
const renderMessage = require('./lib/message');

async function run() {
  try {
    console.log(`action: ${context.payload.action}`);
    console.log(`[data] payload: ${JSON.stringify(context.payload)}`);

    const config = new Config(core);
    console.log(`[data] config: ${JSON.stringify(config)}`);

    const pull = new Pull(context.payload);
    console.log(`[data] pull (payload): ${JSON.stringify(pull)}`);


    const token = core.getInput('GITHUB_TOKEN');
    const octokit = getOctokit(token);

    console.log(`[info] get reviews`);
    const reviews = await octokit.pulls.listReviews({
      owner: pull.owner,
      repo: pull.repo,
      pull_number: pull.pull_number
    });

    console.log(`[info] get checks`);
    const checks = await octokit.checks.listForRef({
      owner: pull.owner,
      repo: pull.repo,
      ref: pull.branch_name
    });

    pull.compileReviews(reviews);
    pull.compileChecks(checks);
    console.log(`[data] pull (checks + reviews): ${JSON.stringify(pull)}`);

    console.log(`merge: ${pull.canMerge(config)}`);

    if (config.test_mode) {

      // comment in test mode
      await octokit.issues.createComment({
        owner: pull.owner,
        repo: pull.repo,
        issue_number: pull.pull_number,
        body: renderMessage(github.context.payload.action, config, pull)
      });

    } else {
      if (pull.canMerge(config)) {

        // merge the pull request
        console.log(`[info] merge start`);
        await octokit.pulls.merge({
          owner: pull.owner,
          repo: pull.repo,
          pull_number: pull.pull_number,
          merge_method: config.merge_method
        });
        console.log(`[info] merge complete`);

        if (config.delete_source_branch) {
          if (pull.headRepoId !== pull.baseRepoId) {
            console.log(`[warning] unable to delete branch from fork, branch retained`);
          } else {
            // delete the branch
            console.log(`[info] delete start`);
            await octokit.git.deleteRef({
              owner: pull.owner,
              repo: pull.repo,
              ref: pull.ref
            });
            console.log(`[info] delete complete`);
          }
        }
      }
    }
  } catch (error) {
    core.setFailed(error.message);
  }
}

run();