执行git push heroku main时npm install流程无限循环的问题求助

尝试从项目根目录将应用部署到Heroku时，构建过程中install命令陷入无限循环，重复执行cd server && npm install && cd ../client && npm install。

相关日志 #

remote:        > mygym-gym@1.0.0 install
remote:        > cd server && npm install && cd ../client && npm install
remote:
remote:        
remote:        added 301 packages, and audited 302 packages in 4s
remote:
remote:        16 packages are looking for funding
remote:          run `npm fund` for details
remote:
remote:        found 0 vulnerabilities
remote:        
remote:        > mygym-gym@1.0.0 install
remote:        > cd server && npm install && cd ../client && npm install
remote:
remote:        
remote:        up to date, audited 302 packages in 820ms
remote:
remote:        16 packages are looking for funding
remote:          run `npm fund` for details

项目配置 #

根目录package.json脚本配置 #

"scripts": {
    "start": "node server/server.js",
    "develop": "concurrently \"cd server && npm run watch\" \"cd client && npm start\"",
    "install": "cd server && npm install && cd ../client && npm install",
    "seed": "cd server && npm run seed",
    "build": "cd client && npm run build"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "concurrently": "^5.1.0"
  }

server目录package.json脚本配置 #

"scripts": {
    "start": "node server.js",
    "watch": "nodemon server.js",
    "seed": "node config/seeds.js"
  }

client目录package.json脚本配置 #

"scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  }

此前部署过类似应用，首次遇到该问题，求问循环原因及解决办法。

核心原因 #

Heroku的构建逻辑中，执行npm install安装根目录依赖时，会自动触发根目录package.json里名为install的自定义脚本。而你的这个脚本又会去执行server和client目录的npm install，当子目录的依赖安装完成后，Heroku会检测到项目文件有变动，再次触发根目录的npm install，进而又调用自定义的install脚本，形成无限循环。

解决办法 #

方案1：重命名根目录的install脚本 #

不要用install这个npm特殊钩子名称，改成比如install-all，再通过postinstall自动触发：

"scripts": {
    "start": "node server/server.js",
    "develop": "concurrently \"cd server && npm run watch\" \"cd client && npm start\"",
    "install-all": "cd server && npm install && cd ../client && npm install",
    "seed": "cd server && npm run seed",
    "build": "cd client && npm run build",
    "postinstall": "npm run install-all"
  }

这样Heroku执行默认npm install时不会触发你的自定义脚本，而postinstall会在根目录依赖安装完成后自动执行子目录的安装，完全避开循环。

方案2：指定Heroku构建命令 #

在根目录package.json里添加heroku-postbuild脚本，让Heroku直接执行自定义的安装+构建流程，跳过默认的循环触发逻辑：

"scripts": {
    // ... 其他原有脚本
    "install-all": "cd server && npm install && cd ../client && npm install",
    "heroku-postbuild": "npm run install-all && npm run build"
  }

Heroku会自动识别并执行heroku-postbuild作为构建环节的核心命令，不会再重复触发根目录的npm install。

内容的提问来源于stack exchange，提问作者dplumbonline