Question

这是一个很棒的功能，我们可以使用＆＃34; npm以编程方式，＆＃34;但是我遇到了一些问题。功能＆＃34; npm.load＆＃34;似乎没有解雇。我没有得到我的＆＃34; npm.load＆＃34;中的任何控制台日志。或＆＃34; npm.commands.install＆＃34;功能

var npm = require('npm');

// There is another promise here
.then(function(path) {

  // this is working the way I intend it to
  cache[requestId].package = JSON.parse(path);

  // This is firing
  if (cache[requestId].package.name && cache[requestId].package.version && cache[requestId].package.scripts.start) {

    // console logs and an array [ 'keystone', 'async', 'underscore', 'swig', 'node-sass', 'node-sass-middleware', 'dotenv' ]
    console.log(Object.keys(cache[requestId].package.dependencies));

    // console logs as /Users/207004/Desktop/github/mothership/server/app/routes/tractor-beam/ms-apps/my_site
    console.log(localPath);

    // console logs as a [Function]
    console.log(npm.load);

    // *** Here is the issue! This is not firing! ***
    npm.load({}, function(err) {

      // no console log
      console.log(npm.commands.install);

      // no console log
      console.log(err);
      npm.commands.install(localPath, Object.keys(cache[requestId].package.dependencies), function(err, done) {

        // no console log
        console.log('loaded');

        // no console log
        console.log(err, done);

        // I am assuming that this is not firing, but my code does fire the console log in the next promise
        return PM2.connectAsync();
      });
    });
  } else {
    console.log('else');
  }
})
// Another promise chained here. A console log inside of this promise is firing.

任何帮助将不胜感激。如果您有任何问题，请与我们联系。

谢谢，

Answer 1

我花了几天时间，但我想了很多。

当我正在研究这个问题时，似乎已从npmjs.com中移除了documentation for using npm programmatically。不确定是否意味着他们弃用了模块，但在我发现文档被删除后我决定使用“child_process”。
当我在上面说过“npm.load”和“npm.install”没有被触发时，原因是我的节点应用程序运行了npm“nodemon”。每次我运行“加载”或“安装”nodemon都会认为这是对目录的更改，我的应用程序将重新启动。我也遇到了与“child_process”相同的问题。真傻！我知道了！
使用下面提供的解决方案，npm安装需要一段时间才能以编程方式运行，因此请做好相应的计划。

这是我提出的解决方案，它是承诺：

var Promise = require('bluebird');

// This will create promise functions for all the methods in the "child_process" module.
// Created "exec.execAsync" below.
var exec = Promise.promisifyAll(require('child_process'));

// Function to make package names one long string for the command line.
var getDependencies = function(dependencies) {
  var deps = '';

  Object.keys(dependencies).forEach(function(el){
    deps = deps + ' ' + el;
  });

  return deps;
};

// Promise before this reads the package.json file
.then(function(packageJson){
  var deps;
  var pack = JSON.parse(packageJson);
    if(pack && pack.dependencies) {
      deps = getDependencies(pack.dependencies);

      // I used the "--prefix" flag because I wanted to install the dependencies in a different directory.
      // This part takes a while. Plan your promises before and after accordingly.
      // The command below console logs into this "npm install --prefix /Users/Max/Desktop/github/mothership/server/app/routes/tractor-beam/ms-apps/my_site keystone async underscore swig node-sass node-sass-middleware dotenv"
      return exec.execAsync('npm install --prefix ' + localPath + deps);
    }
  })
// Continues to next promise

如果您有任何问题，请与我们联系。

使用＆＃34; npm install＆＃34;的问题编程

1 个答案: