小项目中管理npm包版本的思路与方法

const path = require('path');
const projectRoot = process.cwd();
const projectPack = require(path.resolve(projectRoot, 'package.json'));
// 需要对比的包名
const modules = ['element-ui'];
const allDependencies = {
  ...(projectPack.dependencies || {}),
  ...(projectPack.devDependencies || {}),
};

modules.forEach(module => {
  try {
    const packVersion = allDependencies[module];
    // 有一些包名是有文件夹的比如@vue/cli-service，是在@vue文件夹下
    const realPath = packVersion.aplit('/');
    const pack = require(path.resolve(
      ...[projectRoot, 'node_modules', ...realPath, 'package.json'],
    ));
    const needVersions = packVersion.match(/\d+/g);
    const realVersions = pack.version.match(/\d+/g);
    for (const i in needVersions) {
      if (
        isDef(needVersions[i]) &&
        isDef(realVersions[i]) &&
        parseInt(realVersions[i]) < parseInt(needVersions[i])
      ) {
        exit(module);
      }
    }
  } catch (error) {
    exit(module);
  }
});

function exit(moduleName) {
  throw new Error(`${moduleName} 版本过低，请执行 npm i/npm install`);
}
function isDef(num) {
  return num !== null && num !== undefined;
}

 "scripts": {
    "check": "node build/checkNpmPackageVersion.js",
    "dev": "npm run check && vue-cli-service serve",
    "build": "npm run check && vue-cli-service build",
    "lint": "vue-cli-service lint"
  },