yarn-lock-check.js

const chalk = require('chalk');
const fs = require('fs');
const lockfile = require('@yarnpkg/lockfile');
const path = require('path');

const yarnLockContent = fs.readFileSync('yarn.lock', 'utf8');
const yarnLockParsed = lockfile.parse(yarnLockContent);

const allowedRegistriesRe =
  /https:\/\/registry.yarnpkg.com|http:\/\/registry.npmjs.org/;

if (yarnLockParsed && yarnLockParsed.object) {
  let incorrectRegistries = [];
  for (let key of Object.keys(yarnLockParsed.object)) {
    if (yarnLockParsed.object[key]) {
      let resolved = yarnLockParsed.object[key].resolved;
      if (resolved && !allowedRegistriesRe.exec(resolved)) {
        incorrectRegistries.push(resolved);
      }
    }
  }

  if (incorrectRegistries.length > 0) {
    console.log(
      chalk.bold.red(
        `yarn.lock contains registry other than https://registry.yarnpkg.com`,
      ),
    );
    incorrectRegistries.forEach((item) => {
      console.log(chalk.bold.red(item));
    });
    process.exit(1);
  } else {
    console.log(chalk.bold.green('✅ success'));
  }
}