fast-npm-install.js

const path = require('path');
const fs = require('fs');
const shell = require('shelljs'); // Todo: `npm install --save-dev shelljs@0.8.4` for the first time on CI
const crypto = require('crypto');

// 如果 package-lock.json 都没有变化，就 skip `npm install`，节省ci时间。

const dirPath = path.join(__dirname, '..');
shell.cd(dirPath);

const hashFunc = crypto.createHash('md5');

shell
  .exec(`fd package-lock.json`)
  .toString()
  .split('\n')
  .filter((item) => !!item)
  .map((lockFile) => {
    hashFunc.update(fs.readFileSync(lockFile));
  });

const checksum = hashFunc.digest('hex');
console.log('All package-lock.json checksum is:', checksum);

const file = '.node_modules_checksum.txt';
if (fs.existsSync(file)) {
  const hash = fs.readFileSync(file, 'UTF-8');
  if (hash === checksum) {
    console.info('>>> No changes in package-lock.json, skip npm install!');
    process.exit(0);
  }
}
fs.writeFileSync(file, checksum);
shell.exec(`npm install`);
process.exit(0);