Get current git message and print into stdout

GetGitMessages.ts

import { spawnSync } from 'child_process';
const child = spawnSync('git', ['log', '-1', '--pretty=format:%s']);
if (child.error) {
  // tslint:disable-next-line: no-console
  console.error(null);
  process.exit(1);
}

// tslint:disable-next-line: no-console
console.log(
  JSON.stringify({
    message: child.stdout.toString().slice(0, 99),
  }),
);