git-info-generator.mjs

import { execSync } from 'child_process';
import { writeFileSync } from 'fs';

try {
  execSync('git --version');
} catch (error) {
  console.error(error.message);
  throw new Error(`git is missing, please install git and retry`);
}
const gitInfo = [
  'git rev-parse --abbrev-ref HEAD',
  'git log -1 --pretty=format:%h',
  'git describe --tags --abbrev=0',
].map((r, index) => {
  try {
    return execSync(r, { encoding: 'utf8' }).trim();
  } catch (error) {
    console.error(error.message);
    if (index === 2) throw new Error(`no tag found fetch tags by running "git fetch --all --tags"`);
    throw error;
  }
});
writeFileSync('.git-info', gitInfo.join('\n'));