comment.js

const github = require('@actions/github');
const core = require('@actions/core');

function getBody(warnings, errors) {
  return `Compilation Warnings:\n${warnings.join('\n')}\n\nCompilation Errors:\n${errors.join('\n')}\n`;
}

module.exports = async (warnings, errors) => {
  const payload = github.context.payload;
  if (github.context.eventName !== 'pull_request') {
    return;
  }

  const octokit = github.getOctokit(core.getInput('github-token'));
  await octokit.issues.createComment({
    owner: payload.repository.owner.login,
    repo: payload.repository.name,
    issue_number: payload.number, // eslint-disable-line camelcase
    body: getBody(warnings, errors)
  });
};